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70's era varsity with modern BB

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70's era varsity with modern BB

Old 03-30-09, 10:17 AM
  #1  
timmyquest
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70's era varsity with modern BB

Howdy all.

Some of you may or may not recall this "project"


I've got it all cleaned up, i just need to figure out what i'm going to do with the drive train/wheels.

My girlfriend has a trek that she bought last summer and it came with Sora components which i have replaced (for her b-day) with 105.

So i'm thinking i'd like to put the Sora on this Schwin but i would (obviously) need an adapter for the BB and then i would need to space the rear triangle.

I'm not too concerned about changing the frame but i am in need of some assistance on what i can do about the BB.
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Old 03-30-09, 10:24 AM
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rotharpunc
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just get a american to euro BB adapter
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Old 03-30-09, 10:25 AM
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There are conversion cups to go from the 1 piece to a 3 piece crank.

https://sheldonbrown.com/harris/opc.html#opc

look down the page for the TruVative Crank adapters..they're like 20 something bux.
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Old 03-30-09, 10:30 AM
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Damn, that was painless. Thanks guys.
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Old 04-02-09, 10:09 AM
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Make sure you press the adaptor in -- you can't draw it together with screw tension because the threads are not strong enough. I drilled out a big washer to make a ghetto press for this so I could press both sides in at the same time and keep them aligned so the screws would still go in straight. If you search this forum you will find 3 or 4 threads about this.
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Old 04-02-09, 10:12 AM
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Originally Posted by reverborama View Post
Make sure you press the adaptor in -- you can't draw it together with screw tension because the threads are not strong enough. I drilled out a big washer to make a ghetto press for this so I could press both sides in at the same time and keep them aligned so the screws would still go in straight. If you search this forum you will find 3 or 4 threads about this.
Having not done this ever, i'm not entirely sure what you mean.
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Old 04-02-09, 10:25 AM
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The adaptor has 3 screws. It is a press fit into the shell. You need to press it in so that the screw holes are aligned. The temptation is to press the adaptor in on one side then use the screws to pull the two halves together thus pulling the second half of the adaptor into place. The problem is that the threads are aluminum and the screws are very thin so you'll strip the threads if you do that.

I made a press out of a big bolt and some large washer. I drilled 3 holes in one of the washers so I could line up the two halves of the adaptor with the screws in place and press them in so they were perfectly lined up.
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