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Brake caliper reach.. Front is good, rear is short?

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Brake caliper reach.. Front is good, rear is short?

Old 02-20-10, 10:16 PM
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tmh657
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Brake caliper reach.. Front is good, rear is short?

The wheels and rims are the same. The brake calipers are the same, Shimano 600. The frame is a late 80's Bianchi, Japanese made. 700c wheels.
The front brake reaches the rim but the rear does not, short by about 1/4 inch. What's up with that? I could see that both might be off but not just one.
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Old 02-20-10, 10:53 PM
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Originally Posted by tmh657 View Post
The wheels and rims are the same. The brake calipers are the same, Shimano 600. The frame is a late 80's Bianchi, Japanese made. 700c wheels.
The front brake reaches the rim but the rear does not, short by about 1/4 inch. What's up with that? I could see that both might be off but not just one.
I'm willing to bet the frameset was originally spec'ed with 27" wheels? My japanese Bianchi '87 was the same way - front reach was o.k. but the rear was not. If your frame has horizontal dropouts you may be able to play around with the rear axle position in the dropouts to minimize the reach needed.
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Old 02-20-10, 10:55 PM
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It's fairly common, or certainly was when your frame was built for the rear brake bridge to rim distance to be greater than fork hole to rim distance. I can't give you a good reason for it, but that's the way it is. It's that way on every frame Ive ever owned.

These days they're usually close enough for both to be within the shoe adjustment range of the same arches, but years ago it was common practice to use longer reach brakes in back.
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Old 02-20-10, 11:18 PM
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It does have horizontal dropouts, not real long but it's worth a shot. It almost works the way it is.
If they were some new calipers I would just get a longer reach but not just going to quickly source a 600 long reach caliper.
Thanks for the replies.
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