27" to 700c v-brake question
04-03-18, 12:28 PM
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27" to 700c v-brake question
After much hand wringing, I've decided to convert an older touring frame to a flat bar 1x10 grocery bike. Part of the process is going from 27" wheels to 700c.
I know this is a bad idea, but it's too late to talk me out of it.
So I'm looking for advice on the best v-brakes to pick up that could provide the requisite adjustability, given that the rim will be 4mm lower and the studs are sometimes narrower on 27" forks.
Shimano cantis have a good reputation for adjustment for this type of usage, wondering if the v-brakes will work, too.
I know this is a bad idea, but it's too late to talk me out of it.
So I'm looking for advice on the best v-brakes to pick up that could provide the requisite adjustability, given that the rim will be 4mm lower and the studs are sometimes narrower on 27" forks.
Shimano cantis have a good reputation for adjustment for this type of usage, wondering if the v-brakes will work, too.
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04-03-18, 01:27 PM
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I have no particular brake to recommend. But I would recommend taking some actual and accurate measurements of the height of your brake posts from the axles, and then calculating where the slot on a brake arm will have to be to put the pad on the brake track of a 622 rim. Then you can measure prospective choices and see if they will work.
Protip: Take into account the diameter of the brake pad mounting post, don't just measure to the bottom of the slot. Millimeters might matter a lot in this situation.
Shimano used to post information about the parameters of brake post height and width that would work with their brakes. Not sure if they still do but that might give you a start.
Protip: Take into account the diameter of the brake pad mounting post, don't just measure to the bottom of the slot. Millimeters might matter a lot in this situation.
Shimano used to post information about the parameters of brake post height and width that would work with their brakes. Not sure if they still do but that might give you a start.
04-03-18, 02:34 PM
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"I know this is a bad idea, but it's too late to talk me out of it."
That's a bit like "hold my beer and watch this", but good luck with the project.
That's a bit like "hold my beer and watch this", but good luck with the project.
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04-03-18, 02:43 PM
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What would make this a bad idea?
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04-03-18, 03:37 PM
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Originally Posted by noglider
What would make this a bad idea?
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04-04-18, 12:07 AM
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Originally Posted by icepick_trotsky
The forum is scattered with numerous canti-fork 27" woes.
Without any of that info, it's a total crapshoot.
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04-04-18, 06:51 AM
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I am running 700c rims on my 1985 Trek 620 with cantis. It took some adjustment to get the pads to line up with the braketrack, but it works. It might not work as well, but it works.
04-04-18, 08:31 AM
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Originally Posted by arimajol
I am running 700c rims on my 1985 Trek 620 with cantis. It took some adjustment to get the pads to line up with the braketrack, but it works. It might not work as well, but it works.
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04-04-18, 08:32 AM
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Originally Posted by The Golden Boy
If you’re using the stock brakes- the BR MC-70 brakes are among the most adjustable cantis evAr.
04-04-18, 11:04 AM
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Originally Posted by arimajol
I am. This thread made me consider updating them...but then you saved the day.
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