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-   -   Brake rotors choices (http://www.bikeforums.net/mountain-biking/924985-brake-rotors-choices.html)

ohiogsp 12-05-13 09:56 AM

Brake rotors choices
 
I am buying new rotors and was wondering what is the deal with the rotors with hardly any steel there? Some are pretty solid with just holes then some are like nothing left. I am getting 203mm and don't do downhill stuff so heat is not a huge deal for me but want alot of stopping power. Thanks

thehammerdog 12-05-13 11:44 AM

is there after mrket options s one could Upgrade to lighter rotors?? Or are most the same? Mine sux

Lew. 12-17-13 06:31 PM

More holes/cutouts = more surface area for cooling, the greater amount of air that gets to the disc, means more air to cool them.
(Shimano had an 'ice' system where they had an aluminium core for heat dissipation).

I guess there's also the whole 'weight' thing, but I guess that's not a concern if you're after 203mm.

cryptid01 12-17-13 07:34 PM

Quote:

Originally Posted by Lew. (Post 16338368)
More holes/cutouts = more surface area for cooling, the greater amount of air that gets to the disc, means more air to cool them.

Fewer holes/cutouts usually = greater thermal mass which allows the rotor to absorb more heat before overcooking.

Choose wisely.

floating dutchy 12-17-13 09:57 PM

Quote:

Originally Posted by thehammerdog (Post 16303546)
is there after mrket options s one could Upgrade to lighter rotors?? Or are most the same? Mine sux

Why do you say yours suck? What is the difference between different designs?

Bandrada 12-18-13 09:59 AM

I have never actually put much thought into it, but in my experience performance is mostly isolated to the braking system and not necessarily in the rotors. I'm assuming the 203 is on the front. That's plenty of stopping power so just about any style of rotor will do. For the purposes of aesthetics I generally try and match the front and back, but that's just being picky.

floating dutchy 12-18-13 09:28 PM

Quote:

Originally Posted by Bandrada (Post 16339827)
I have never actually put much thought into it, but in my experience performance is mostly isolated to the braking system and not necessarily in the rotors. I'm assuming the 203 is on the front. That's plenty of stopping power so just about any style of rotor will do. For the purposes of aesthetics I generally try and match the front and back, but that's just being picky.

Yea? I like the look of the bigger rotor on the front, form following function I guess, I do like having a 180 up front and a 160 back there, Makes the brakes feel more even.

Bandrada 12-18-13 10:59 PM

Quote:

Originally Posted by floating dutchy (Post 16341808)
Yea? I like the look of the bigger rotor on the front, form following function I guess, I do like having a 180 up front and a 160 back there, Makes the brakes feel more even.

Don't misunderstand, dutch. I'm sure there are rotors that are aesthetically pleasing, and yet their performance is sub-par. Maybe I've been lucky, but I've never actually run into such a scenario. Probably because skulls and bones aren't really that appealing to me. haha! For instance, I just purchased some Hope rotors (203F/183R) and while they are quite impressive to look at, their performance is also top notch. Granted they are on a trail bike, and like you I'm not too concerned with them overheating. It's a good conversation, anyway. Now that I'm wondering about it, it's very possible that the composition of the rotor is of significant importance.

fietsbob 12-18-13 11:31 PM

got money to throw at it .. ceramic- carbon fiber discs with their own special pads are out there.

at a more modest cost the aluminum cores are a heat-sink for the steel disc

rather than cooking your hydraulic fluid.

lighter? Titanium .. there is a steel aluminum sandwich too..

Bandrada 12-18-13 11:47 PM

Quote:

Originally Posted by fietsbob (Post 16342093)
got money to throw at it .. ceramic- carbon fiber discs with their own special pads are out there.

at a more modest cost the aluminum cores are a heat-sink for the steel disc rather than cooking your hydraulic fluid.

I don't think heat is an issue. Are there materials that have better friction capabilities, which allow manufacturers to be more creative with the design? I have a pair of XT rotors that have have the aluminum spider. I can't say I've ever seen a marked improvement in performance. Although they work really well, and are easy to true. Again, overheating is rarely an issue. Of course, some other added benefits are that they look pretty cool, and are noticeable lighter.

fietsbob 12-18-13 11:53 PM

I have Avid G2 discs 4 hole Rohloff rear 6 hole with a centerlock adapter in front BB7 mechanicals

160 front and rear in 20" wheels in my bike friday ... mine work fine but my needs are not yours

and I cannot test ride your bike to judge for myself , so this is mostly Idle chit chat..

cheers :beer:


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