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Question about bottom bracket and crank

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Question about bottom bracket and crank

Old 05-18-13, 06:57 PM
  #1  
tha17
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Question about bottom bracket and crank

So im trying to build a fixie.

I am looking at new cranks and bottom brackets and I wanted to make sure that they will fit correctly

Here is the crank I am getting

https://www.ebay.com/itm/110976945520...84.m1497.l2649

My question is what would be a compatible bottom bracket for this crank (and the frame)?

For my frame, the length of the bottom bracket tube (idk exactly what its called) is 68mm
The diameter of the inside of it is 35mm
and it is threaded inside

if anyone could point me in the right direction, thatd be great
thanks
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Old 05-18-13, 07:06 PM
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stillcovalent
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Based on my assumption that the crankset does not look like a Japanese marque, you should consider an ISO bottom bracket made for 68mm bottom bracket shells. A standard bb will be fine unless your frame/bb shell is Italian or French (or Swiss..) It might be a good idea to contact the seller to inquire what the crank manufacturer says about which bottom bracket it is compatible with.

Good luck!

Last edited by stillcovalent; 05-18-13 at 07:11 PM.
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Old 05-18-13, 07:25 PM
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68mm shell and left handed threads on the drive side almost guarantees english threaded BB's unless it's an offbeat bike brand. Wiki link

Here's what you're looking for: Square [the more common, JIS] taper, english thread. Aim for about 105mm (+/- a couple MM should be fine as well) of spindle.

I'm 99% sure that's NOT an ISO taper.

Look at it like this- if it's an ISO crankset, you'll just ride a little outboard on a JIS spindle, if it's a JIS crankset and you're on an ISO spindle, you risk bottoming out and riding on loose cranks.

Learn yourself: https://sheldonbrown.com/bbtaper.html

E: This set of those cranks on amazon says to get a 103mm BB. Get a 103mm shimano BB and call it a day.
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Last edited by IthaDan; 05-18-13 at 07:28 PM.
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Old 05-18-13, 07:29 PM
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https://www.s-shun.com/product_detail.php?id=85

I am assuming that axle length refers to spindle length of bb, and I'd assume its his as it definitely isn't power spline
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Old 05-18-13, 07:53 PM
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Originally Posted by IthaDan View Post
68mm shell and left handed threads on the drive side almost guarantees english threaded BB's unless it's an offbeat bike brand. Wiki link

Here's what you're looking for: Square [the more common, JIS] taper, english thread. Aim for about 105mm (+/- a couple MM should be fine as well) of spindle.

I'm 99% sure that's NOT an ISO taper.

Look at it like this- if it's an ISO crankset, you'll just ride a little outboard on a JIS spindle, if it's a JIS crankset and you're on an ISO spindle, you risk bottoming out and riding on loose cranks.

Learn yourself: https://sheldonbrown.com/bbtaper.html

E: This set of those cranks on amazon says to get a 103mm BB. Get a 103mm shimano BB and call it a day.
Thanks for the reply,
Would this work?
https://www.ebay.com/itm/TANGE-68-X-1...item5d3387a8e5
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Old 05-18-13, 08:02 PM
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Originally Posted by tha17 View Post
Thanks for the reply,
Would this work?
https://www.ebay.com/itm/TANGE-68-X-1...item5d3387a8e5

How about you do what he says, and get a 103mm BB?
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Old 05-18-13, 08:05 PM
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tha17
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Sorry, I just know very little about these.
He said +/- a couple mm would be fine and I just wanted to check..
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Old 05-18-13, 08:15 PM
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$20

https://www.ebay.com/itm/MOJO-Bottom-...264#vi-content
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