Bigger rotors – more power, but less modulation
They weigh exponentialy more, tiny 140mm rotors can get away with 3 or 4 arms holding the disk to the hub, 203mm+ rotors often have over double that, 8, 10 or more, and IME are often thicker too.
I run 160/140mm on my XC singlespeed, and 203/185 on my big bike. At 95kg I really should put bigger rotrs on the singlespeed, in the dry I reckon V’s might be more powerfull, I actualy gave myself a shock getting on the road bike and pulling the brakes!Posted 7 years agomessiahMember
25g or so per extra 20mm for the disk, and roughly the same for the mounting kit – so 50g per wheel per extra 20mm.
If your brakes are not feeling short of power and your not cooking them all the time on scary alpine descents I doubt you need bigger rotors.
205’s are very prone to rock strikes so if you can get away with smaller I would.
Question I’ve been wondering recently is wether to go for a lightweight brake package with a big disk, or go for a more powerful brake with a smaller disk -the brake systems would work out at similar weights and it would be interesting to find out if there are issues with either option.
Hope X2 with 203 vs Hope M4 with 160
Avid Elixir with 203 vs Avid Code (2011) with 160.
Interesting experiment for a mag to do I think – I think I’ll make this question a thread of it’s own…Posted 7 years agochiefgrooveguruMember
I think smaller discs are likely to perform better at low temperatures or in wet conditions when your riding is less gnarr as they’ll warm up quicker and thus stay at optimum temperature longer – which will also result in less squeal. I’d thus only go to bigger discs if suffering brake fade with smaller ones (not had it properly on the bike, had it once in the car and it wasn’t much fun!)Posted 7 years agoStuey01Member
Wasn’t someone saying the other day that Peaty uses 140’s?
He used them on his World Champs winning bike, small brakes was one of a load of weight saving measures they employed so he could eke out some extra speed on the very pedally course. I don’t think he uses them as a matter of course.Posted 7 years ago
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