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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 10-15-10, 10:31 PM   #1
fixedgear80
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Need some help with my bike chain-line predictions!

Hmmm. I have a Raleigh Comp G.S. 80's
The driveside B.B. cup is stuck like stupid. I have a friend with the tools? but I dont have the time/or want to wait until Tuesday to work on the bike. There is no guarantee that I will even be able to get it off without spending any money. So.. I want to know if there is a way to figure out if the Stock Campy 10 speed bottom bracket (rebuilt) will work with my Eighthinch track crank and track wheelset thats on my current bike. The campy B.B. is (90% decent shape) just a few signs of wear and looks to be almost the same spindle length as my track B.B. just a bit (5mm's) longer. I have the option of moving the chainring left or right a few mm's. I want to know if there is a calculation I can use to figure this out before stripping my bike for a test fit! I still have a single speed B.B. I can use once the Campy B.B. has wore out. Or should I wait and try and get the cup off? Is a used Campy 68-SS worth anything?

P.s. I have all the tools at my home to take apart the bike.

The track wheelset has spacers on it to fit my 21 speed road bike frame: its a bit wider than the Competition frame I also use those for adjustments!

I have my calculator at the ready
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Old 10-15-10, 10:42 PM   #2
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You can do it yourself with Sheldon's help.

Since Campagnolo spindles are ISO and EighthInch uses JIS bottom bracket, they aren't exactly compatible.
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Old 10-15-10, 10:55 PM   #3
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Quote:
Originally Posted by Vixtor View Post
You can do it yourself with Sheldon's help.

Since Campagnolo spindles are ISO and EighthInch uses JIS bottom bracket, they aren't exactly compatible.
So the Campy spindle wont fit my Eighthinch Crankset? Darn...
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Old 10-15-10, 11:03 PM   #4
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Well, they'd fit but it's not going to be perfect.

Quote:
Originally Posted by Sheldon's Article
J.I.S. cranks (most Japanese models) may bottom out if installed on ISO spindles.
In practice, you can very often get away with mixing these sizes, as long as you select an axle length that gives the desired chainline.
http://www.sheldonbrown.com/bbsize.html#square
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Old 10-15-10, 11:19 PM   #5
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Right... After reading Sheldon info its possible to make it work, but then there is the problem of getting the crank to properly tighten on the spindle. What do you think should I try it out or just try to get the cup off and swap in my JIS Origin 8 sealed B.B. (English thread). That will work with the threading on a Raleigh Comp? I'm hoping so.
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Old 10-15-10, 11:37 PM   #6
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I've seen it done before, forcing it on might damage the tapered holes in the cranks, I'd stick with the Origin8 bottom bracket just to be safe.

You could also try asking in the mechanic section to see what those experts think it's safe to do.
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Old 10-16-10, 05:30 PM   #7
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Well I just test fitted the crank and the rear wheel on the new frame and it looks like it should line up once put together.
The good news is that I have a back-up sealed BB just on case which should work also. Will have to bring both bikes to the shop for swapping the parts out! Hopefully I can trade the frame/fork for a "road" brake setup! Thanks for your help!
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