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vintage bike with modern brake caliper - caliper hits fork crown race

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vintage bike with modern brake caliper - caliper hits fork crown race

Old 10-05-15, 09:56 AM
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joejack951
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vintage bike with modern brake caliper - caliper hits fork crown race

I'm finally building up a 1984 Trek 660 I bought several years ago, using a full Shimano 105 5800 groupset. I'm barely into the build last night when I go to attach the front brake after lubing and setting the headset preload. I tighten the caliper down only to find that my fork no longer turns smoothly. The top of the brake caliper 'arch' is interfering with the crown race which overhangs the edge of the fork. I can post a picture later today if necessary.

I'm thinking I have two options:

1. Add a spacer (maybe 3-5mm thick) between the caliper and fork to move the caliper out far enough to clear the overhang of the crown race
2. Grind a little material off the brake caliper at its highest point, probably 1mm total material removed for adequate clearance

Option 1 sounds attractive but I know I'll constantly be looking at the spacer and wanting it gone. Option 2 seems low risk and likely unnoticeable with a little black touch up paint. I'm hoping that someone else has been down this road before and can let me know which option they chose (perhaps different than my two) and offer any insight/hindsight on the process.

Thanks in advance!
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Old 10-05-15, 10:20 AM
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JohnDThompson 
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This isn't a problem with your modern caliper; it happened a lot BITD as well. The solution then was to put an additional star washer on the pivot bolt to move the caliper further out.

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Old 10-05-15, 10:24 AM
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Thanks, John! Knowing that it is a common problem and not due to my mash up of new and old parts makes me feel better about just adding the spacer. I may try to add some paint to disguise it still.
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Old 10-05-15, 10:24 AM
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Moe Zhoost
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I've run into this before and just used a spacer. If all you need is 3-5 mm, I can't imagine that it will be that much of an eyesore. You won't see it when riding and that's what you should be doing anyway, right?
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Old 10-05-15, 10:27 AM
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Originally Posted by Moe Zhoost View Post
I've run into this before and just used a spacer. If all you need is 3-5 mm, I can't imagine that it will be that much of an eyesore. You won't see it when riding and that's what you should be doing anyway, right?
I can be a bit fickle ;-) You're right, though. I won't see it when riding and knowing I'm not the only guy with that extra spacer in there will help me get over it when I see it while hanging the back up after a ride.
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