Chalo wrote: ↑
Jul 06 2018 12:39pm
billvon wrote: ↑
Jul 06 2018 12:14pm
[...]and retrofitted front disks (because at >1KW you really need front disks.)
People keep saying this, and it keeps being untrue. At high speed you need good
brakes, not necessarily disc brakes. Some, not all, disc brakes are good. Some, not all, rim brakes are good. But I will say this-- the strongest rim brakes are stronger than the strongest disc brakes. Why wouldn't they be? They have much larger rotors with much higher heat capacity.
The best bicycle discs anywhere can't touch these rim brakes:
If you're retrofitting disc brakes to a bike that didn't come with them, before first trying quality brake pads and a booster arch, you must be determined to spend more money than necessary to have worse wheels and probably worse braking too.
I agree with your points about suspension and bikesdirect, but strongly disagree about the idea that rim brakes can work better, or even as well as discs. It’s just wrong, and the proof is all over the place, from motorcycles to tandems.
As discs became better and more affordable maybe 15 years ago, some of the big players in the tandem industry valiantly tried to make the same arguments you are making: rim brakes are actually using a huge rotor, with better heat dissipation, and they just need to be set up properly to work just as well, or even better than discs. Never mind that when your rim is wet and/or covered in grime, you lose a ton of braking power. Or that when your rim goes out of true, your “rotor” is now warped. Or that the pads have to travel farther to contact the rim, so you lose modulation at the lever. Or that when your rim overheats on a long descent, your tire can explode off the front rim and annhilate you and your stoker. It happens. That is why tandems used to often come with a secondary “drag brake”. Thankfully, almost all high end tandems now feature disc brakes.
Magura came out with a really cool hydraulic rim brake in the 90s, i rode and raced with them for awhile and they worked great. The idea did not last, because they don’t hold a candle to modern hydraulic discs. Neither does that bizarre vintage thing pictured above, that looks like it weighs three pounds and is operated by a cable.
This is a myth that needs to be busted. If disc brakes were not superior, then they would not be used in almost every performance application when extreme stopping power is required. Even Luddite roadie cyclists are beginning to accept discs in their super lightweight racing bikes.
Rim brakes can be adequate, but discs are better. Way, way better.