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Old 10-13-10, 02:02 PM   #1
costajebus
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How to determine what size brakes i need...

Converting pre-1975 57cm Nishiki Olympic from fixed gear to single speed via flip/flop hub. I want to add a front brake. How do I know what size or type of brake i need? Any advice for bike novice appreciated.

Thanks
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Old 10-13-10, 02:12 PM   #2
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Measure from the center of the brake mounting hole in the frame/fork to the center of the braking surface on the rim.
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Old 10-13-10, 02:13 PM   #3
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Reach is the distance from the brake bolt to the wheel rim.
brakes are stated as the range of reach, if the reach on your frame to rim measurement.
falls in the middle of that range you get that one.

then its all brand preferences , many used a center-pull back then, they're OK.

Side-pull dual pivot is the new design, they're good too.

Last edited by fietsbob; 10-13-10 at 02:17 PM.
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Old 10-13-10, 02:21 PM   #4
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With wheels mounted, measure the distance from the brake mounting hole to the center of the braking surface on the rim. "Short reach" road brakes are 39-49mm. "Long reach" road brakes measure 47-57mm. Any longer than that and you'll be looking at BMX brake calipers.

Modern bikes have "recessed" brake mounting where the nut securing the brake is recessed into the frame or fork. Older bikes had exposed nuts and bolts.
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Old 10-13-10, 03:12 PM   #5
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I measured and thought i got 65mm. I guess I need the biguns. I will double check. Thanks
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Old 10-13-10, 03:55 PM   #6
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Originally Posted by costajebus View Post
I measured and thought i got 65mm. I guess I need the biguns. I will double check. Thanks
Was this bike also converted to 700c rims? That would contribute to larger brake reach.

If it is 65mm, then Tektro r556 calipers will be one option.
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Old 10-14-10, 10:40 AM   #7
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If a recessed brake bolt will fit, you can get Tektro R556 (~$35), Diacompe BRS202 (~$40), or Paul Racer Brake (~$100). Non-recessed versions of those are available, but may be harder to find. You could also find an older used brake that happens to fit -- but that will take some luck.
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Old 10-14-10, 02:08 PM   #8
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Any brake that is 'long reach' will work. If it is still too short you can take a rat tail the brake pad mounts for a more mm. We were having to do this alot on the cheaper entry level road bike.
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