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27" to 700c v-brake question

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27" to 700c v-brake question

Old 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.
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Old 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.
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Old 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.
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Old 04-03-18, 02:43 PM
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What would make this a bad idea?
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Old 04-03-18, 03:37 PM
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Originally Posted by noglider View Post
What would make this a bad idea?
The forum is scattered with numerous canti-fork 27" woes.
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Old 04-04-18, 12:07 AM
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Originally Posted by icepick_trotsky View Post
The forum is scattered with numerous canti-fork 27" woes.
Yeah, but lots of success stories, too. Measure the width between your canti posts and post that here. Or the model/year of your frame. Someone else will have been in a similar situation here, and may have some info to share.

Without any of that info, it's a total crapshoot.
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Old 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.
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Old 04-04-18, 08:31 AM
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Originally Posted by arimajol View Post
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.
If you’re using the stock brakes- the BR MC-70 brakes are among the most adjustable cantis evAr.
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Old 04-04-18, 08:32 AM
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Originally Posted by The Golden Boy View Post
If you’re using the stock brakes- the BR MC-70 brakes are among the most adjustable cantis evAr.
I am. This thread made me consider updating them...but then you saved the day.
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Old 04-04-18, 11:04 AM
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Originally Posted by arimajol View Post
I am. This thread made me consider updating them...but then you saved the day.


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