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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 01-23-08, 03:32 PM   #1
VwFix
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BB size??

I have a shwinn world sport that i converted to a fixed gear,a dn i just picked up some new cranks, now I need your guys help on how to find a proper size BB for square taper cranks, any help would be appreciated. here is a pic of the bike.
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Old 01-23-08, 03:38 PM   #2
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what brand/model are the cranks?
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Old 01-23-08, 03:52 PM   #3
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sugino Xd
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Old 01-23-08, 04:13 PM   #4
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New Sugino xd needs a 107 according to this:

http://www.benscycle.net/index.php?m...181da72ab25b15
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Old 01-23-08, 05:06 PM   #5
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But what diameter and will a 107 give me a decent chainline? or is that stuff usually is standard.
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Old 01-23-08, 05:18 PM   #6
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you'll need a standard english (68mm) bottom bracket in whichever length. since you say you need 107mm, get a Shimano UN-54 107mm cartridge unit. they are cheap and do the job quite well.
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Old 01-23-08, 05:24 PM   #7
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kind ot but im converting the same bike... did you have any trouble with the rear dropouts being so short?
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Old 01-23-08, 05:27 PM   #8
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nope no issue with drop outs.
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Old 01-23-08, 07:45 PM   #9
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Quote:
Originally Posted by VwFix View Post
But what diameter and will a 107 give me a decent chainline? or is that stuff usually is standard.
68mm is standard for American, Japanese, and most English bikes and the 107 will give you a 42mm chainline. 42 is pretty standard for track hubs.

What rear hub are you running?
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Old 01-23-08, 08:32 PM   #10
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68mm is the diameter of the bottom bracket. 107mm is the length of the crank axle/spindle.
Most bikes will be 68mm with a 24 tpi (threads per inch) bracket. Also known as the English bracket.

You can get old style bottom brackets that are cups, ball bearings, and the axle. The axle can be had in different lengths. Axles come with three sections and the middle distance must be the right one for your bottom bracket or the bearings won't be happy.



As usual, Sheldon Brown has the answers; go check out his website.
http://sheldonbrown.com/chainline.html
http://sheldonbrown.com/harris/botto...ets.html#axles

Last edited by bbattle; 01-23-08 at 08:40 PM.
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Old 01-23-08, 09:59 PM   #11
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Quote:
Originally Posted by bbattle
68mm is the diameter of the bottom bracket.
I think you mean bottom bracket shell width.
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