Rear post adaptor.

welsh brian

Evening all I have a Canyon nerve am 6 and am planning on getting a set of hope v2 brakes for it and running 203mm discs front and rear. I can find the adaptor for the front no problems but car'nt seem to find a post to post adaptor for a 203mm rear disc.Is it just me or am I looking in the wrong place?

Thanx Brian

cooldad

Probably.
Superstar sell them, but I doubt there's much call for them.

welsh brian

superstar has an adaptor type 8 according to there website which fits front and rear but looks to put the caliper forwards to it's current placing so I assume it would'nt sit right on the disc as the curent adaptor just sits under the caliper and the bolts go throgh the caliper, adaptor and then the frame. Would a 180mm disc be better?

cooldad

I don't know anyone who runs a 203 rear. Even people with 203 fronts seem to manage fine with a 160 rear, so I would think 180 is more than enough.
The rear does very little work, and under heavy braking all the weight is on the front anyway, so it will l,ock up very easily.

welsh brian

The smallest they do for v2 brakes is 183mm so it'll have to be that one I think. I ride mostly at cwmcarn the twrch trail and the dowwnhill but by the time I get the the bottom of the downhill my hands are aching from braking and I don't go slow either so I figured bigger is better

cooldad

I don't do DH but Twrch doesn't need much braking - I have 160mm each end and no problems. And I'm not light.
Maybe better brakes instead of bigger?

YeehaaMcgee

Or use less brakes?

bails87

YeehaaMcgee wrote:

Or use less brakes?

This or what cooldad said.

nicklouse

IIRC the mount uses the same as the front post standard but i have not checked this and can not find any drawings for the rear post standard if there is one.

will see is i can find anything later.

welsh brian

I only really need the bigger brakes for the downhill, twrch is just a nice ride to the top.

I might pop into the lbs on the weekend and ask them for some advice, might even come out with some new brakes.

Shackster

They are the same front and rear. Had to get 180mm adapters for my canyon. Asked in a LBS and they hadn't heard of rear post mount, and were doubting me until I pointed one out on one of their display bikes!

cobba

nicklouse wrote:

IIRC the mount uses the same as the front post standard but i have not checked this and can not find any drawings for the rear post standard if there is one.

will see is i can find anything later.

Rear post mount drawing/measurements/dimensions can be found here.

The Rookie

203mm on the rear is daft, a friend had them on his bike and on downhills when he just wanted to trail the brakes a bit to shed speed he couldn't stop it locking up and had several moments, he's now using 180's on the rear. Only worth going 203mm if you need big heat capacity for a long downhill (as in race type environment).

nicklouse

cobba wrote:

nicklouse wrote:

IIRC the mount uses the same as the front post standard but i have not checked this and can not find any drawings for the rear post standard if there is one.

will see is i can find anything later.

Rear post mount drawing/measurements/dimensions can be found here.

cheers will be added to the brake mount FAQ.

or put into a new FAQ... not sure yet.

nicklouse

The Beginner wrote:

203mm on the rear is daft, a friend had them on his bike and on downhills when he just wanted to trail the brakes a bit to shed speed he couldn't stop it locking up and had several moments, he's now using 180's on the rear. Only worth going 203mm if you need big heat capacity for a long downhill (as in race type environment).

203 rears have there place and on a DH race bike is not always one. it totally depends on the rider and track. 180 and 140 is suitable for some riders and some brakes.

again running larger rotors also means that you can run the levers closer to the bars and you do not need to pull the brakes on as such. just squeeze. helps a lot with fatigue.