Cooking my brakes

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twowheelsgood

Senior Member
Need some advice here. I'm not an aggressive rider but I am heavy and tend to ride long mountain routes. I live in Switzerland so we do mountain biking with real mountains. You can easily run 40mins to an hour downhill.

Now my problem has been brake fade. Last time I rode from Kleine Scheidegg to Grindelwald, my Hayes 9s and 160mm disks simply stopped working about 2/3rds of the way down levers to the bars. Clearly they'd overheated and the rotor was discoloured.

Now for the next season I got some cheap Shimano SLXs which are killer value at the moment to the point it's hardly worth servicing the old set-up. This replaces the Hayes which are a PITA to keep serviceable - my bike shop HATES THEM. My question is, is it advisable to go for a big rotor to help my braking problem? The main problems being my weight and the relatively lightweight stock fork (it's a Manitou black with quick release dropouts.

What would be my best option? I was thinking 203mm/180mm, the rear being larger than normal to act more as a drag brake and cope with the heat. Would 203/160 be better or 180/160 enough?

What are your thoughts on a stronger, solid axle without QR handles for extra security?

It's a minefield of options and my MTB knowledge isn't great. My current thinking is my style is gentle and I don't think it'll be a problem, it's just if I use the set up as aggressively as it has the potential to be I could cause damage.

Thanks folks. Hopefully it'll have 7kg less to cope with next spring.
 

Globalti

Legendary Member
TBH you might do better to go and ask on Singletrackworld, they are more mountain bike specific and lots of the regulars go to the Alps so Alpine braking is often discussed.

here: http://singletrackworld.com/forum/
 

Alun

Guru
Location
Liverpool
Check if you are using sintered brake pads, they should be better than standard pads for downhill, but everything has it's limits.
 

baznav

Active Member
don't go sintered they are more abrasive and will cook faster, go with 180,s front and rear and try that.
 

lukesdad

Guest
:thumbsup:
 

02GF74

Über Member
To stop, your kinetic energy (related to your speed and weight) has to be converted to heat, that goes into the discs.

The larger the diameter of the disc, the more mass it has to aborb the heat and usually larger area to dissipate the heat to the air.

I would recommend you increase diameter of both discs 180/180, maybe go to 203 on the front. Check that your front fork can take the larger 203 disc.
 
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