trying to build a tourer out of bits and bobs in the shed and have an old wheel with mavic 223 disc rim that I want to use but the frame only takes v-brakes. There's a flat edge that looks like it could take a v-brake but also a very clear sticker saying 'disc only'. So...is it worth taking a risk or should I find an alternative?
find an alternative it will work just not for very long then itl just get messy.
Naa, go for it, natural selection in action.........
From what I understand the braking surface on a disc only rim is thinner so would wear away muck quicker than a rim braking rim. Also the braking surface will be smaller / narrower so rim brakes will not be as efficient. I wouldn't recommend using the 223 rim at all!
Don't. Is all I can say to you. If it's not designed for the purpose there is probably a very good reason for it.
If you do use it you could be a candidate for the Darwin awards
but also a very clear sticker saying 'disc only'.
Who did you get to read that out to you. 🙂
I suppose I'll try and make a semi educated guess at the reasons why not to do this.
a) On rim brake specific rims the braking surface is deep enough so that there is a safe margin above and below the pads to avoid two unfavourable occurrences - namely a pad into the spokes or a pad causing catastrophic tyre failure.
b) Related to a), the braking surfaces must be normal to the plane of rotation, so compressive braking forces don't translate into pad movement into the spokes or tyre.
c) The braking surface much have sufficient material so that it can tolerate a reasonable amount of wear without suffering premature material failure. When material failure occurs from wear the failure mode should be gradual. The braking surface material should be wear tolerant and provide a good friction co-efficient.
d) The internal structure of the rim should be able to provide an equal and opposite reaction to the compressive forces from the pads, so that material fatigue and failure doesn't occur.
Just guessing.
Just wish I was able to "guess" as well as Waderider 🙂
So that's a no then...just trying to recycle (and be a cheapskate...)
Don't we all break rules all the time?
I have to agree its not going to work for too long but if its your back wheel and you keep a close eye on it...
Plus if you do it then at least we will all know.
Please file a report when it goes through.
Sorry mugboo - decided to have a go at rebuilding an old hope hub instead that fortunately had a suitable rim built on to it. I shouldn't imagine that'll work much better though...
I reckon it would be ok short term, beyond that, who knows.
Well...you could use it as a wheel. I wouldn't recommend trying to use a rim-brake on it though. Hence my suggestion: build a bike with no back brake. It'll still be road legal if you have a front brake.
done it in the past with 317 mavic disc rims it was fine
If you do go ahead with your build make sure when you ride it there is always someone following you filming your ride. Then when the wheel fails you can then send the tape to You've been framed and then spend the £250 on a v brake compatible wheel....
RID needs to be a fixed for that Shirley?
This thread is quite a good microcosm for stw IMO.
Most jumping on the op and calling him stupid.
A few folk applying their minds and offering useful advice.
I feel a 'best bodge' thread coming up...
Surely a big part of riding bikes is about building something out of whatever's left in the shed.
I'd try it on the rear of a pub bike, not sure about a tourer though.
Surely whether he should do this depends on whether he has a mate willing to video all his riding on that bike (and post it ont' Utube for our benefit of course)
buy a disk brake for it 😕 you can get a cable one if its only a tourer
what do you need a frckin brake for anyway ya pussy!!!!
Having had a v brake rim 'explode' because of wear (so that's what the wear markers are for!!), I'd suggest not.
Maybe he's better ad avoiding the obviously avoidable?
Having had a v brake rim 'explode' because of wear
I've had one in 15 years, and I've been using Maguras on the every-day bike for the last three years, I tend to wreck hubs before rims.
However, the one that did go was 'exciting'