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

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!

shimano crankset

share|improve this question

asked Mar 28 at 14:54

GaryRGaryR

111

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.

add a comment | 

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!

shimano crankset

share|improve this question

asked Mar 28 at 14:54

GaryRGaryR

111

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.

add a comment | 

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

asked Mar 28 at 14:54

GaryRGaryR

111

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

asked Mar 28 at 14:54

GaryRGaryR

111

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

asked Mar 28 at 14:54

GaryRGaryR

111

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 Mar 28 at 14:54

GaryRGaryR

111

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 Mar 28 at 14:54

GaryRGaryR

111

2 Answers
2

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oldest

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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

edited Mar 29 at 11:24

answered Mar 28 at 15:57

Argenti ApparatusArgenti Apparatus

36.7k23891

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The issue is that there are MTB and Road versions of Hollowtech BBs. Doh! I forgot all about that!
  
  – Andrew Henle
  Mar 28 at 15:59
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Swifty kross.pl/en/2019/mtb-xc/level-10-0 says SM-BB52
  
  – Argenti Apparatus
  Mar 29 at 11:22
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Why yes it does. Google found me what must be last yrs model kross.pl/en/2018/mtb-xc/level-10-0
  
  – Swifty
  Mar 29 at 11:32
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @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
  Mar 29 at 15:33
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you, your link is my bike, 19' Level 10.0
  
  – GaryR
  Mar 29 at 17:58
  

  
  
  
  

 | 
show 1 more comment

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

answered Mar 28 at 15:49

Andrew HenleAndrew Henle

2,658814

• 
  
  
  

  
  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
  Mar 29 at 18:01
  

  
  
  
  

add a comment | 

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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

edited Mar 29 at 11:24

answered Mar 28 at 15:57

Argenti ApparatusArgenti Apparatus

36.7k23891

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The issue is that there are MTB and Road versions of Hollowtech BBs. Doh! I forgot all about that!
  
  – Andrew Henle
  Mar 28 at 15:59
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Swifty kross.pl/en/2019/mtb-xc/level-10-0 says SM-BB52
  
  – Argenti Apparatus
  Mar 29 at 11:22
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Why yes it does. Google found me what must be last yrs model kross.pl/en/2018/mtb-xc/level-10-0
  
  – Swifty
  Mar 29 at 11:32
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @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
  Mar 29 at 15:33
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you, your link is my bike, 19' Level 10.0
  
  – GaryR
  Mar 29 at 17:58
  

  
  
  
  

 | 
show 1 more comment

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

edited Mar 29 at 11:24

answered Mar 28 at 15:57

Argenti ApparatusArgenti Apparatus

36.7k23891

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The issue is that there are MTB and Road versions of Hollowtech BBs. Doh! I forgot all about that!
  
  – Andrew Henle
  Mar 28 at 15:59
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Swifty kross.pl/en/2019/mtb-xc/level-10-0 says SM-BB52
  
  – Argenti Apparatus
  Mar 29 at 11:22
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Why yes it does. Google found me what must be last yrs model kross.pl/en/2018/mtb-xc/level-10-0
  
  – Swifty
  Mar 29 at 11:32
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @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
  Mar 29 at 15:33
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you, your link is my bike, 19' Level 10.0
  
  – GaryR
  Mar 29 at 17:58
  

  
  
  
  

 | 
show 1 more comment

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

edited Mar 29 at 11:24

answered Mar 28 at 15:57

Argenti ApparatusArgenti Apparatus

36.7k23891

share|improve this answer

edited Mar 29 at 11:24

answered Mar 28 at 15:57

Argenti ApparatusArgenti Apparatus

36.7k23891

answered Mar 28 at 15:57

Argenti ApparatusArgenti Apparatus

36.7k23891

answered Mar 28 at 15:57

Argenti ApparatusArgenti Apparatus

36.7k23891

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

answered Mar 28 at 15:49

Andrew HenleAndrew Henle

2,658814

• 
  
  
  

  
  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
  Mar 29 at 18:01
  

  
  
  
  

add a comment | 

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

answered Mar 28 at 15:49

Andrew HenleAndrew Henle

2,658814

• 
  
  
  

  
  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
  Mar 29 at 18:01
  

  
  
  
  

add a comment | 

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

answered Mar 28 at 15:49

Andrew HenleAndrew Henle

2,658814

share|improve this answer

answered Mar 28 at 15:49

Andrew HenleAndrew Henle

2,658814

answered Mar 28 at 15:49

Andrew HenleAndrew Henle

2,658814

answered Mar 28 at 15:49

Andrew HenleAndrew Henle

2,658814