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JIS and ISO square taper

What road double cranksets will work with a 108mm JIS square taper bottom bracket spindle?Are these compatible bottom brackets?What went wrong with my bottom bracket spindle length calculation?What are the different types of bottom brackets?Help me understand bottom brackets and cranksI can remove crank arms without a crank puller, is this a problem? I'm worried the crankarms might be looseOrienting Shimano Cup and Cone square-taper bottom bracket spindlecranks for a JIS bottom bracketReplace old square taper bottom bracket / ISO or JIS?Ideal distance between chainring and chain stay

3

I've read Sheldon Brown's page on JIS and ISO and have read exchanges in forums about the pros and cons of using ISO cranks on JIS bottom brackets.

If my understanding is correct, these standards define the shape and dimensions of the BB spindle and thus have implications for the cut made in the crank that must fit on the spindle.

The reason for my question is that a vendor of ISO cranksets is telling me that their cranksets will work on an ISO or JIS bottom bracket if the bike is a folding bike. Does whether the bike folds have anything at all to do with this compatibility between BB and crank?

crankset bottom-bracket folding-bicycle

share|improve this question

asked Mar 21 at 15:05

TᴚoɯɐuoTᴚoɯɐuo

1845

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  It does not make any sense at all. What is this vendor?
  
  – ojs
  Mar 21 at 15:53
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @ojs: It's not the manufacturer but an online seller, so I'd rather not give any particulars, but it's not one that is well-known.
  
  – Tᴚoɯɐuo
  Mar 21 at 17:58
  

  
  
  
  


• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  I don't see any particular reason why they should be protected from their own incompetence.
  
  – ojs
  Mar 21 at 18:35
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I'd prefer to inoculate the ignorant (like myself) against their incompetence.
  
  – Tᴚoɯɐuo
  Mar 21 at 20:31
  

  
  
  
  

add a comment | 

3

I've read Sheldon Brown's page on JIS and ISO and have read exchanges in forums about the pros and cons of using ISO cranks on JIS bottom brackets.

If my understanding is correct, these standards define the shape and dimensions of the BB spindle and thus have implications for the cut made in the crank that must fit on the spindle.

The reason for my question is that a vendor of ISO cranksets is telling me that their cranksets will work on an ISO or JIS bottom bracket if the bike is a folding bike. Does whether the bike folds have anything at all to do with this compatibility between BB and crank?

crankset bottom-bracket folding-bicycle

share|improve this question

asked Mar 21 at 15:05

TᴚoɯɐuoTᴚoɯɐuo

1845

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  It does not make any sense at all. What is this vendor?
  
  – ojs
  Mar 21 at 15:53
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @ojs: It's not the manufacturer but an online seller, so I'd rather not give any particulars, but it's not one that is well-known.
  
  – Tᴚoɯɐuo
  Mar 21 at 17:58
  

  
  
  
  


• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  I don't see any particular reason why they should be protected from their own incompetence.
  
  – ojs
  Mar 21 at 18:35
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I'd prefer to inoculate the ignorant (like myself) against their incompetence.
  
  – Tᴚoɯɐuo
  Mar 21 at 20:31
  

  
  
  
  

add a comment | 

I've read Sheldon Brown's page on JIS and ISO and have read exchanges in forums about the pros and cons of using ISO cranks on JIS bottom brackets.

If my understanding is correct, these standards define the shape and dimensions of the BB spindle and thus have implications for the cut made in the crank that must fit on the spindle.

The reason for my question is that a vendor of ISO cranksets is telling me that their cranksets will work on an ISO or JIS bottom bracket if the bike is a folding bike. Does whether the bike folds have anything at all to do with this compatibility between BB and crank?

crankset bottom-bracket folding-bicycle

share|improve this question

asked Mar 21 at 15:05

TᴚoɯɐuoTᴚoɯɐuo

1845

share|improve this question

asked Mar 21 at 15:05

TᴚoɯɐuoTᴚoɯɐuo

1845

share|improve this question

asked Mar 21 at 15:05

TᴚoɯɐuoTᴚoɯɐuo

1845

asked Mar 21 at 15:05

TᴚoɯɐuoTᴚoɯɐuo

1845

asked Mar 21 at 15:05

TᴚoɯɐuoTᴚoɯɐuo

1845

1 Answer
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4

Does whether the bike folds have anything at all to do with this compatibility between BB and crank?

Executive summary:

NO!

Longer answer:

Here's the Sheldon Brown link: https://www.sheldonbrown.com/bbtaper.html

Even though both ISO and JIS have the same taper angle, ISO spindles are narrower than JIS spindles, so an ISO crank won't go all the way onto a JIS spindle.

Depending on the specifics of the crankset and spindle, how far the cranks go onto the spindle may or may not be sufficient to both be safe and able to withstand usage for a good amount of time.

But I wouldn't do it for any bike I might ride - I view the situation you've described as a somewhat unethical attempt to make a sale. It might work, but saying it will just because the bike folds is, well, sleazy.

Because whether or not the bike folds doesn't matter. The specifics of the bottom bracket spindle and the crank itself matter. And a crank where the design prevents full engagement of the load-bearing surface with a close-but-not-quite-right bottom bracket spindle isn't a configuration I'd be able to recommend with a clean conscience.

share|improve this answer

answered Mar 21 at 16:12

Andrew HenleAndrew Henle

2,608814

add a comment | 

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4

Does whether the bike folds have anything at all to do with this compatibility between BB and crank?

Executive summary:

NO!

Longer answer:

Here's the Sheldon Brown link: https://www.sheldonbrown.com/bbtaper.html

Even though both ISO and JIS have the same taper angle, ISO spindles are narrower than JIS spindles, so an ISO crank won't go all the way onto a JIS spindle.

Depending on the specifics of the crankset and spindle, how far the cranks go onto the spindle may or may not be sufficient to both be safe and able to withstand usage for a good amount of time.

But I wouldn't do it for any bike I might ride - I view the situation you've described as a somewhat unethical attempt to make a sale. It might work, but saying it will just because the bike folds is, well, sleazy.

Because whether or not the bike folds doesn't matter. The specifics of the bottom bracket spindle and the crank itself matter. And a crank where the design prevents full engagement of the load-bearing surface with a close-but-not-quite-right bottom bracket spindle isn't a configuration I'd be able to recommend with a clean conscience.

share|improve this answer

answered Mar 21 at 16:12

Andrew HenleAndrew Henle

2,608814

add a comment | 

4

Does whether the bike folds have anything at all to do with this compatibility between BB and crank?

Executive summary:

NO!

Longer answer:

Here's the Sheldon Brown link: https://www.sheldonbrown.com/bbtaper.html

Even though both ISO and JIS have the same taper angle, ISO spindles are narrower than JIS spindles, so an ISO crank won't go all the way onto a JIS spindle.

Depending on the specifics of the crankset and spindle, how far the cranks go onto the spindle may or may not be sufficient to both be safe and able to withstand usage for a good amount of time.

But I wouldn't do it for any bike I might ride - I view the situation you've described as a somewhat unethical attempt to make a sale. It might work, but saying it will just because the bike folds is, well, sleazy.

Because whether or not the bike folds doesn't matter. The specifics of the bottom bracket spindle and the crank itself matter. And a crank where the design prevents full engagement of the load-bearing surface with a close-but-not-quite-right bottom bracket spindle isn't a configuration I'd be able to recommend with a clean conscience.

share|improve this answer

answered Mar 21 at 16:12

Andrew HenleAndrew Henle

2,608814

add a comment | 

Does whether the bike folds have anything at all to do with this compatibility between BB and crank?

Executive summary:

NO!

Longer answer:

Here's the Sheldon Brown link: https://www.sheldonbrown.com/bbtaper.html

Even though both ISO and JIS have the same taper angle, ISO spindles are narrower than JIS spindles, so an ISO crank won't go all the way onto a JIS spindle.

Depending on the specifics of the crankset and spindle, how far the cranks go onto the spindle may or may not be sufficient to both be safe and able to withstand usage for a good amount of time.

But I wouldn't do it for any bike I might ride - I view the situation you've described as a somewhat unethical attempt to make a sale. It might work, but saying it will just because the bike folds is, well, sleazy.

Because whether or not the bike folds doesn't matter. The specifics of the bottom bracket spindle and the crank itself matter. And a crank where the design prevents full engagement of the load-bearing surface with a close-but-not-quite-right bottom bracket spindle isn't a configuration I'd be able to recommend with a clean conscience.

share|improve this answer

answered Mar 21 at 16:12

Andrew HenleAndrew Henle

2,608814

share|improve this answer

answered Mar 21 at 16:12

Andrew HenleAndrew Henle

2,608814

answered Mar 21 at 16:12

Andrew HenleAndrew Henle

2,608814

answered Mar 21 at 16:12

Andrew HenleAndrew Henle

2,608814