Can I replace a Shimano FC-MT500 26/36 crankset with a Shimano Ultegra FC-R8000 36/46 set? The Next CEO of Stack OverflowHow do I calculate the diameter of a chainring from the number of teeth?Can I use an “8 speed compatible” crank such as Shimano FC-2303 with a 7 speed Shimano MF-HG37 freewheel?SRAM x9 3x9 with a 10 speed Shimano SXL FC-M660 CranksetReplace crankset or cassette for better road performance on an MTB?Can I replace only the smallest cog on my rear cassette?Replacement crankset for Shimano SG B 52/39?Can I convert from a 52/42/30 crankset to 50/39/30?Larger sproket on a single speed crankset?50/34 vs 52/36 crankset for 11-32 cassette (shimano 105 5800FC)Crank Arm Compatibility - Shimano Ultegra 6800 and R8000Can not replace Shimano Octalink with 105 Crankset

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Can I replace a Shimano FC-MT500 26/36 crankset with a Shimano Ultegra FC-R8000 36/46 set?



The Next CEO of Stack OverflowHow do I calculate the diameter of a chainring from the number of teeth?Can I use an “8 speed compatible” crank such as Shimano FC-2303 with a 7 speed Shimano MF-HG37 freewheel?SRAM x9 3x9 with a 10 speed Shimano SXL FC-M660 CranksetReplace crankset or cassette for better road performance on an MTB?Can I replace only the smallest cog on my rear cassette?Replacement crankset for Shimano SG B 52/39?Can I convert from a 52/42/30 crankset to 50/39/30?Larger sproket on a single speed crankset?50/34 vs 52/36 crankset for 11-32 cassette (shimano 105 5800FC)Crank Arm Compatibility - Shimano Ultegra 6800 and R8000Can not replace Shimano Octalink with 105 Crankset










2















On my Kross Level 10.0 MTB (2x10) used mostly on dirt roads and pavement I find I never use 1-10 and seldom go below 15th but I need more top end speed. Wondering if the Ultegra would be a straight swap out?



Thanks!










share|improve this question







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    2















    On my Kross Level 10.0 MTB (2x10) used mostly on dirt roads and pavement I find I never use 1-10 and seldom go below 15th but I need more top end speed. Wondering if the Ultegra would be a straight swap out?



    Thanks!










    share|improve this question







    New contributor




    GaryR is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.






















      2












      2








      2








      On my Kross Level 10.0 MTB (2x10) used mostly on dirt roads and pavement I find I never use 1-10 and seldom go below 15th but I need more top end speed. Wondering if the Ultegra would be a straight swap out?



      Thanks!










      share|improve this question







      New contributor




      GaryR is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.












      On my Kross Level 10.0 MTB (2x10) used mostly on dirt roads and pavement I find I never use 1-10 and seldom go below 15th but I need more top end speed. Wondering if the Ultegra would be a straight swap out?



      Thanks!







      shimano crankset






      share|improve this question







      New contributor




      GaryR is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      share|improve this question







      New contributor




      GaryR is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      share|improve this question




      share|improve this question






      New contributor




      GaryR is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      asked 2 days ago









      GaryRGaryR

      111




      111




      New contributor




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      New contributor





      GaryR is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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          2 Answers
          2






          active

          oldest

          votes


















          4














          Unfortunately no, the Ultegra crankset is not compatible, nor is any other road Shimano crank designed for a Hollowtech II bottom bracket (assuming this is your bike).



          The issue is that there are MTB and Road versions of Hollowtech BBs. MTB ones fit in 68 or 73mm shells, using 2 2.5mm spacers on 68mm ones. Road BBs only fit in 68mm shells. MTB BBs are therefore 5mm wider than road ones. Road crank axles are 5mm shorter than MTB cranks, and are only long enough for road BBs.



          If you have a 68mm BB shell you could put a road BB in it and fit a road crank but the chainline would be way off.



          You could look for larger aftermarket chainrings in the Shimano asymmetric 4-bolt pattern, but you have to deal with chainring clearance issues Andrew Henle described in his answer.






          share|improve this answer

























          • The issue is that there are MTB and Road versions of Hollowtech BBs. Doh! I forgot all about that!

            – Andrew Henle
            2 days ago











          • @Swifty kross.pl/en/2019/mtb-xc/level-10-0 says SM-BB52

            – Argenti Apparatus
            yesterday











          • Why yes it does. Google found me what must be last yrs model kross.pl/en/2018/mtb-xc/level-10-0

            – Swifty
            yesterday











          • @Swifty Chances are the OP does not have a `19 model and has a bike with the PF BB instead of threaded (MT500 crank works with either) but the general principle holds - road cranks have shorter axles.

            – Argenti Apparatus
            yesterday











          • Thank you, your link is my bike, 19' Level 10.0

            – GaryR
            yesterday


















          1














          Probably not.



          Per How do I calculate the diameter of a chainring from the number of teeth? the difference in diameter of the 46-tooth chainring over the original 36-tooth chainring is going to be about 10 * 12.7 mm / 3.14159 or about 40 mm, so the difference in radius will be 20 mm, or about 0.8 inches.



          That means your front derailleur would need to be quite a bit higher than it is now, so much so that the hanger probably won't be high enough, assuming a braze-on attachment.



          So it probably won't work because of that, but you can measure how much space you have available to move the front derailleur higher to get a better idea, especially if you can measure how much space there is between the derailleur and the current crankset.



          If, for example, there's 7 mm between the front derailleur and the current chainring, and there's only 5 mm of space left in the braze-on's slot to move the front derailleur higher, there won't be enough space for a chainring that has a 20 mm larger radius.



          Also, the larger diameter of the inner chain ring might wind up hitting the chainstay. How much space is there?



          All that does assume an identical chainline, too. If the R8000 crank places the chainrings farther out or closer in, that has to be accounted for, too. That can be really important for clearing the chainstay.






          share|improve this answer


















          • 1





            Thank you Andrew, I was hoping for an assortment of chainrings to be available but it isn't the case. I can live with it as-is, just know it could be better for my use. If I ever need to climb a tree with it I know the gearing is there!

            – GaryR
            yesterday











          Your Answer








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          2 Answers
          2






          active

          oldest

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          2 Answers
          2






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          4














          Unfortunately no, the Ultegra crankset is not compatible, nor is any other road Shimano crank designed for a Hollowtech II bottom bracket (assuming this is your bike).



          The issue is that there are MTB and Road versions of Hollowtech BBs. MTB ones fit in 68 or 73mm shells, using 2 2.5mm spacers on 68mm ones. Road BBs only fit in 68mm shells. MTB BBs are therefore 5mm wider than road ones. Road crank axles are 5mm shorter than MTB cranks, and are only long enough for road BBs.



          If you have a 68mm BB shell you could put a road BB in it and fit a road crank but the chainline would be way off.



          You could look for larger aftermarket chainrings in the Shimano asymmetric 4-bolt pattern, but you have to deal with chainring clearance issues Andrew Henle described in his answer.






          share|improve this answer

























          • The issue is that there are MTB and Road versions of Hollowtech BBs. Doh! I forgot all about that!

            – Andrew Henle
            2 days ago











          • @Swifty kross.pl/en/2019/mtb-xc/level-10-0 says SM-BB52

            – Argenti Apparatus
            yesterday











          • Why yes it does. Google found me what must be last yrs model kross.pl/en/2018/mtb-xc/level-10-0

            – Swifty
            yesterday











          • @Swifty Chances are the OP does not have a `19 model and has a bike with the PF BB instead of threaded (MT500 crank works with either) but the general principle holds - road cranks have shorter axles.

            – Argenti Apparatus
            yesterday











          • Thank you, your link is my bike, 19' Level 10.0

            – GaryR
            yesterday















          4














          Unfortunately no, the Ultegra crankset is not compatible, nor is any other road Shimano crank designed for a Hollowtech II bottom bracket (assuming this is your bike).



          The issue is that there are MTB and Road versions of Hollowtech BBs. MTB ones fit in 68 or 73mm shells, using 2 2.5mm spacers on 68mm ones. Road BBs only fit in 68mm shells. MTB BBs are therefore 5mm wider than road ones. Road crank axles are 5mm shorter than MTB cranks, and are only long enough for road BBs.



          If you have a 68mm BB shell you could put a road BB in it and fit a road crank but the chainline would be way off.



          You could look for larger aftermarket chainrings in the Shimano asymmetric 4-bolt pattern, but you have to deal with chainring clearance issues Andrew Henle described in his answer.






          share|improve this answer

























          • The issue is that there are MTB and Road versions of Hollowtech BBs. Doh! I forgot all about that!

            – Andrew Henle
            2 days ago











          • @Swifty kross.pl/en/2019/mtb-xc/level-10-0 says SM-BB52

            – Argenti Apparatus
            yesterday











          • Why yes it does. Google found me what must be last yrs model kross.pl/en/2018/mtb-xc/level-10-0

            – Swifty
            yesterday











          • @Swifty Chances are the OP does not have a `19 model and has a bike with the PF BB instead of threaded (MT500 crank works with either) but the general principle holds - road cranks have shorter axles.

            – Argenti Apparatus
            yesterday











          • Thank you, your link is my bike, 19' Level 10.0

            – GaryR
            yesterday













          4












          4








          4







          Unfortunately no, the Ultegra crankset is not compatible, nor is any other road Shimano crank designed for a Hollowtech II bottom bracket (assuming this is your bike).



          The issue is that there are MTB and Road versions of Hollowtech BBs. MTB ones fit in 68 or 73mm shells, using 2 2.5mm spacers on 68mm ones. Road BBs only fit in 68mm shells. MTB BBs are therefore 5mm wider than road ones. Road crank axles are 5mm shorter than MTB cranks, and are only long enough for road BBs.



          If you have a 68mm BB shell you could put a road BB in it and fit a road crank but the chainline would be way off.



          You could look for larger aftermarket chainrings in the Shimano asymmetric 4-bolt pattern, but you have to deal with chainring clearance issues Andrew Henle described in his answer.






          share|improve this answer















          Unfortunately no, the Ultegra crankset is not compatible, nor is any other road Shimano crank designed for a Hollowtech II bottom bracket (assuming this is your bike).



          The issue is that there are MTB and Road versions of Hollowtech BBs. MTB ones fit in 68 or 73mm shells, using 2 2.5mm spacers on 68mm ones. Road BBs only fit in 68mm shells. MTB BBs are therefore 5mm wider than road ones. Road crank axles are 5mm shorter than MTB cranks, and are only long enough for road BBs.



          If you have a 68mm BB shell you could put a road BB in it and fit a road crank but the chainline would be way off.



          You could look for larger aftermarket chainrings in the Shimano asymmetric 4-bolt pattern, but you have to deal with chainring clearance issues Andrew Henle described in his answer.







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited yesterday

























          answered 2 days ago









          Argenti ApparatusArgenti Apparatus

          36.7k23891




          36.7k23891












          • The issue is that there are MTB and Road versions of Hollowtech BBs. Doh! I forgot all about that!

            – Andrew Henle
            2 days ago











          • @Swifty kross.pl/en/2019/mtb-xc/level-10-0 says SM-BB52

            – Argenti Apparatus
            yesterday











          • Why yes it does. Google found me what must be last yrs model kross.pl/en/2018/mtb-xc/level-10-0

            – Swifty
            yesterday











          • @Swifty Chances are the OP does not have a `19 model and has a bike with the PF BB instead of threaded (MT500 crank works with either) but the general principle holds - road cranks have shorter axles.

            – Argenti Apparatus
            yesterday











          • Thank you, your link is my bike, 19' Level 10.0

            – GaryR
            yesterday

















          • The issue is that there are MTB and Road versions of Hollowtech BBs. Doh! I forgot all about that!

            – Andrew Henle
            2 days ago











          • @Swifty kross.pl/en/2019/mtb-xc/level-10-0 says SM-BB52

            – Argenti Apparatus
            yesterday











          • Why yes it does. Google found me what must be last yrs model kross.pl/en/2018/mtb-xc/level-10-0

            – Swifty
            yesterday











          • @Swifty Chances are the OP does not have a `19 model and has a bike with the PF BB instead of threaded (MT500 crank works with either) but the general principle holds - road cranks have shorter axles.

            – Argenti Apparatus
            yesterday











          • Thank you, your link is my bike, 19' Level 10.0

            – GaryR
            yesterday
















          The issue is that there are MTB and Road versions of Hollowtech BBs. Doh! I forgot all about that!

          – Andrew Henle
          2 days ago





          The issue is that there are MTB and Road versions of Hollowtech BBs. Doh! I forgot all about that!

          – Andrew Henle
          2 days ago













          @Swifty kross.pl/en/2019/mtb-xc/level-10-0 says SM-BB52

          – Argenti Apparatus
          yesterday





          @Swifty kross.pl/en/2019/mtb-xc/level-10-0 says SM-BB52

          – Argenti Apparatus
          yesterday













          Why yes it does. Google found me what must be last yrs model kross.pl/en/2018/mtb-xc/level-10-0

          – Swifty
          yesterday





          Why yes it does. Google found me what must be last yrs model kross.pl/en/2018/mtb-xc/level-10-0

          – Swifty
          yesterday













          @Swifty Chances are the OP does not have a `19 model and has a bike with the PF BB instead of threaded (MT500 crank works with either) but the general principle holds - road cranks have shorter axles.

          – Argenti Apparatus
          yesterday





          @Swifty Chances are the OP does not have a `19 model and has a bike with the PF BB instead of threaded (MT500 crank works with either) but the general principle holds - road cranks have shorter axles.

          – Argenti Apparatus
          yesterday













          Thank you, your link is my bike, 19' Level 10.0

          – GaryR
          yesterday





          Thank you, your link is my bike, 19' Level 10.0

          – GaryR
          yesterday











          1














          Probably not.



          Per How do I calculate the diameter of a chainring from the number of teeth? the difference in diameter of the 46-tooth chainring over the original 36-tooth chainring is going to be about 10 * 12.7 mm / 3.14159 or about 40 mm, so the difference in radius will be 20 mm, or about 0.8 inches.



          That means your front derailleur would need to be quite a bit higher than it is now, so much so that the hanger probably won't be high enough, assuming a braze-on attachment.



          So it probably won't work because of that, but you can measure how much space you have available to move the front derailleur higher to get a better idea, especially if you can measure how much space there is between the derailleur and the current crankset.



          If, for example, there's 7 mm between the front derailleur and the current chainring, and there's only 5 mm of space left in the braze-on's slot to move the front derailleur higher, there won't be enough space for a chainring that has a 20 mm larger radius.



          Also, the larger diameter of the inner chain ring might wind up hitting the chainstay. How much space is there?



          All that does assume an identical chainline, too. If the R8000 crank places the chainrings farther out or closer in, that has to be accounted for, too. That can be really important for clearing the chainstay.






          share|improve this answer


















          • 1





            Thank you Andrew, I was hoping for an assortment of chainrings to be available but it isn't the case. I can live with it as-is, just know it could be better for my use. If I ever need to climb a tree with it I know the gearing is there!

            – GaryR
            yesterday















          1














          Probably not.



          Per How do I calculate the diameter of a chainring from the number of teeth? the difference in diameter of the 46-tooth chainring over the original 36-tooth chainring is going to be about 10 * 12.7 mm / 3.14159 or about 40 mm, so the difference in radius will be 20 mm, or about 0.8 inches.



          That means your front derailleur would need to be quite a bit higher than it is now, so much so that the hanger probably won't be high enough, assuming a braze-on attachment.



          So it probably won't work because of that, but you can measure how much space you have available to move the front derailleur higher to get a better idea, especially if you can measure how much space there is between the derailleur and the current crankset.



          If, for example, there's 7 mm between the front derailleur and the current chainring, and there's only 5 mm of space left in the braze-on's slot to move the front derailleur higher, there won't be enough space for a chainring that has a 20 mm larger radius.



          Also, the larger diameter of the inner chain ring might wind up hitting the chainstay. How much space is there?



          All that does assume an identical chainline, too. If the R8000 crank places the chainrings farther out or closer in, that has to be accounted for, too. That can be really important for clearing the chainstay.






          share|improve this answer


















          • 1





            Thank you Andrew, I was hoping for an assortment of chainrings to be available but it isn't the case. I can live with it as-is, just know it could be better for my use. If I ever need to climb a tree with it I know the gearing is there!

            – GaryR
            yesterday













          1












          1








          1







          Probably not.



          Per How do I calculate the diameter of a chainring from the number of teeth? the difference in diameter of the 46-tooth chainring over the original 36-tooth chainring is going to be about 10 * 12.7 mm / 3.14159 or about 40 mm, so the difference in radius will be 20 mm, or about 0.8 inches.



          That means your front derailleur would need to be quite a bit higher than it is now, so much so that the hanger probably won't be high enough, assuming a braze-on attachment.



          So it probably won't work because of that, but you can measure how much space you have available to move the front derailleur higher to get a better idea, especially if you can measure how much space there is between the derailleur and the current crankset.



          If, for example, there's 7 mm between the front derailleur and the current chainring, and there's only 5 mm of space left in the braze-on's slot to move the front derailleur higher, there won't be enough space for a chainring that has a 20 mm larger radius.



          Also, the larger diameter of the inner chain ring might wind up hitting the chainstay. How much space is there?



          All that does assume an identical chainline, too. If the R8000 crank places the chainrings farther out or closer in, that has to be accounted for, too. That can be really important for clearing the chainstay.






          share|improve this answer













          Probably not.



          Per How do I calculate the diameter of a chainring from the number of teeth? the difference in diameter of the 46-tooth chainring over the original 36-tooth chainring is going to be about 10 * 12.7 mm / 3.14159 or about 40 mm, so the difference in radius will be 20 mm, or about 0.8 inches.



          That means your front derailleur would need to be quite a bit higher than it is now, so much so that the hanger probably won't be high enough, assuming a braze-on attachment.



          So it probably won't work because of that, but you can measure how much space you have available to move the front derailleur higher to get a better idea, especially if you can measure how much space there is between the derailleur and the current crankset.



          If, for example, there's 7 mm between the front derailleur and the current chainring, and there's only 5 mm of space left in the braze-on's slot to move the front derailleur higher, there won't be enough space for a chainring that has a 20 mm larger radius.



          Also, the larger diameter of the inner chain ring might wind up hitting the chainstay. How much space is there?



          All that does assume an identical chainline, too. If the R8000 crank places the chainrings farther out or closer in, that has to be accounted for, too. That can be really important for clearing the chainstay.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered 2 days ago









          Andrew HenleAndrew Henle

          2,648814




          2,648814







          • 1





            Thank you Andrew, I was hoping for an assortment of chainrings to be available but it isn't the case. I can live with it as-is, just know it could be better for my use. If I ever need to climb a tree with it I know the gearing is there!

            – GaryR
            yesterday












          • 1





            Thank you Andrew, I was hoping for an assortment of chainrings to be available but it isn't the case. I can live with it as-is, just know it could be better for my use. If I ever need to climb a tree with it I know the gearing is there!

            – GaryR
            yesterday







          1




          1





          Thank you Andrew, I was hoping for an assortment of chainrings to be available but it isn't the case. I can live with it as-is, just know it could be better for my use. If I ever need to climb a tree with it I know the gearing is there!

          – GaryR
          yesterday





          Thank you Andrew, I was hoping for an assortment of chainrings to be available but it isn't the case. I can live with it as-is, just know it could be better for my use. If I ever need to climb a tree with it I know the gearing is there!

          – GaryR
          yesterday










          GaryR is a new contributor. Be nice, and check out our Code of Conduct.









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          GaryR is a new contributor. Be nice, and check out our Code of Conduct.












          GaryR is a new contributor. Be nice, and check out our Code of Conduct.











          GaryR is a new contributor. Be nice, and check out our Code of Conduct.














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