disc brake adaptor ?

acac

hi i need i little bit of help i have m585 rear disc brake and have a160mm disc but like to put a 180mm on the frame has is fitting just like to no which adaptor i need is it IS to post ot post IS. ?

THANKS

nicklouse

what fitting is the frame? and the caliper?

Looked on page 2 of the FAQs?

beverick

...is there an English translation available?

101_North

This should do if the frame is IS fit.

http://www.chainreactioncycles.com/Mode ... elID=17303

acac

thanks 101_north looks good to me how much better will 180mm disc then be then the 160mm disks
thanks a gain for your help

101_North

Depends. If you can lock up the rear brake easily with a 160mm then a 180mm will be overkill in my opinion.

I fitted a 180mm rotor to the front though and noticed a big improvement in stopping power.

101

acac

yer i can lock the rear wheel i just like haveing a really powerful rear brake i prefer more power on rear then on front. :P

101_North

Someone else might disagree but if you can lock the wheels with a 160mm then I don't see the point in fitting a 180mm unless you're tanking it and want the larger rotor to dissipate the heat better.


101

lugsey2k5

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Anonymous

101_North wrote:

Someone else might disagree but if you can lock the wheels with a 160mm then I don't see the point in fitting a 180mm unless you're tanking it and want the larger rotor to dissipate the heat better.


101

Bigger discs deal with heating much better over long descents. It's not about just being able to lock the wheel

Also, more power on the rear? what for? It's the front that slows you down.

101_North

yeehaamcgee wrote:

101_North wrote:

Someone else might disagree but if you can lock the wheels with a 160mm then I don't see the point in fitting a 180mm unless you're tanking it and want the larger rotor to dissipate the heat better.


101

Bigger discs deal with heating much better over long descents. It's not about just being able to lock the wheel

Which is pretty much what I said

Anonymous

if you can lock the wheels with a 160mm then I don't see the point in fitting a 180mm

sorry but that's just bullcrap.

acac

yer be better for me so deal with heat better more power always good dont wont to have to pull really hard to get the pads to bit i like it when i only have to just touch the lever to stop or to slide the rear end round abit if need to

101_North

yeehaamcgee wrote:

if you can lock the wheels with a 160mm then I don't see the point in fitting a 180mm

sorry but that's just bullcrap.

Oh dear :roll:

Not that I really give a toss but if you're going to quote me then at least quote the whole sentence!

if you can lock the wheels with a 160mm then I don't see the point in fitting a 180mm unless you're tanking it and want the larger rotor to dissipate the heat better

101

Anonymous

It's still nonsense. You can lock the wheel with cantilever brakes, but that doesn't mean discs aren't a huge advantage. Being able to lock has ultimately very very little to do with brake performance.

Chunkers1980

Yee it's not nonsense...

There is a grey area in it.

Allowing the wheel to lock is an ultimate power thing. Lever force required to lock the wheel, if you can then you have the power to do so...

The grey area comes in the feeling and control feedback you get from the system itself. If you can lock the wheel with 160mm then you'll be able to do so with a 180mm but you might lose some of the feeling and it becomes more wooden and the feedback telling you what it's doing is not there in the same way.

That's what a good set of brakes is about, it's not the overall power of the thing that's the over riding factor in if they are any good or not - it's what it tells your whole body it's doing through the feedback it gives you - the X factor.

I've got Formula Oro k18 and Avid E5s - the Oros just seem to let you know what they are doing better and you know more where you are with them and what their next moves will be depending on what you do... It's not quite the same with the Avids...

101_North

yeehaamcgee wrote:

It's still nonsense. You can lock the wheel with cantilever brakes, but that doesn't mean discs aren't a huge advantage. Being able to lock has ultimately very very little to do with brake performance.

I can see you've got the bit between your teeth

All I meant was that if he can lock the wheels and stay in full control - all in a way he is happy with (one fingered braking, two fingered, whatever) then the rotor is probably big enough! A larger rotor would, however, help with cooling (as mentioned) or require less finger force if that's what he was after. Once the wheels are locked, they're locked, the size of the rotor is no longer relevant at this point and things like tyres, grip etc surely come into play.

My original post was possibly over simplified but there you go! .

101

Anonymous

fair enough, but you gave a very simplistic view.
Up to a point, having more brake power for less finger effort gives better modulation.
For example, with some imaginary "terrible" brakes, you could lock the wheels by crushing the lever immensely hard, but you would not have much modulation near to that point.
If on the other hand, you had a brake where you could lock the wheel with a comfortable pressure exerted, it would be physiologically easier to maintain fine control up to that point.

jayson

For what its worth i have 203mm rotors front and rear and my brakes have masses of power and modulation to hand.

I would always say get the biggest rotors u can because u can never have to much stopping power

nicklouse

jayson wrote:

I would always say get the biggest rotors u can because u can never have to much stopping power

except that in poor grip conditions you have poor modulation as the tyre grip is the limiting factor.