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)

1986 Schwinn Madison

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Old 12-21-17, 11:19 AM
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JohnnyLuna
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1986 Schwinn Madison

A 68X103 BB should fit just fine on this frame right? Rear 120mm - using a Sugino GLP Crank - 130mm Spider.... My first track frame - always made conversions... Stoked on this frame!
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Old 12-21-17, 11:26 AM
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JohnnyLuna
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1986 Schwinn Madison

A 68X103 BB should fit just fine on this frame right? Rear 120mm - using a Sugino GLP Crank - 130mm Spider.... My first track frame - always made conversions... Stoked on this frame!
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Old 12-21-17, 01:46 PM
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ThermionicScott 
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I can't speak to that frame, but I use a 68x103 BB with my Sugino GLP. (Actually 144 BCD.)

The thing to watch out for is that if the cranks have been installed and removed a few times in their past, the NDS crank may sit very close to the BB shell and may even contact it, forcing you to use a longer BB.
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Old 12-21-17, 02:53 PM
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Old 12-21-17, 03:24 PM
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motrheadsroadie
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those cranks need a 116 spindle. since they are road cranks youre converting to a singlespeed, a 103 will probably cause the crank spider to hit the frame.
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Old 12-21-17, 03:36 PM
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JohnnyLuna
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Thanks, I'm just sitting on a Dura Ace 68x103 BB that i hope does the trick so it finally gets some use, think this build will be pretty simple, just hope that BB does the trick and finally gets some use, it spins so smooth....
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Old 12-21-17, 09:16 PM
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Old 12-21-17, 11:32 PM
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Originally Posted by JohnnyLuna View Post
Thanks, I'm just sitting on a Dura Ace 68x103 BB that i hope does the trick so it finally gets some use, think this build will be pretty simple, just hope that BB does the trick and finally gets some use, it spins so smooth....
Step one: Install the 103mm BB you have on hand and drive side crank arm to proper torque.

Step two: Measure your chainline (from the center of your BB shell to the chainring). If it's less than 42mm, calculate how many mm you need to add to bring it right around 42mm. Multiply that number by two, add it to 103 and that is the correct spindle length you need.
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