Originally Posted by
Fentuz
yes, that's why I cannot understand why dahon and tern put 160discs instead of 140mm.
I ain't complaining about 160mm rear, 180mm front. I'll continue to spec that combo on my 406ers.
The other factors, of course, are heat dissipation and longevity. The bigger the rotor, the better the heat dissipation and less fade during continued breaking, and the more the rotor can be expected to last.
But I suspect manufacturers spec larger rotors to make up for weaker brakes. A bigger rotor is cheaper than a more powerful caliper. If you've got bum calipers, the cheapest way to get more bite is by upsizing the rotor or getting better brake pads.