Bike Forums - View Single Post - Hydraulic Disc Brakes vs. Mechanical Disc??

05-30-07 | 07:19 PM

#20

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Joined: Oct 2005

Posts: 10,939

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From: The Summit of Lee

Bikes: Hecklah

Quote:

Originally Posted by Raiyn

Let's start by taking a look at the basic blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, hence better braking.

Actually if the whole reason you get larger rotors was solely for heat dissipation...then why does my bike stop quicker when I'm going 2mph with a 7" roter than when I'm going 2mph with a 6" rotor? There's no heat dissipation involved in such a slow speed yet the 7" rotor is noticeably easier to stop...hmmm.

I'm not mocking anyone here, just having fun.

The reason is b/c the further out you grip on a disc...the more leverage you have in relation to the center point. The reason V-brakes don't really apply to this is because the V-brake mechanism in itself is nowhere nearly as powerful as the disc caliper. If you had a disc caliper mounted all the way out at the rim (like on a Buell motorcycle that I saw) then you'd have rediculous stopping power with the 25" rotor.

I don't disagree that heat dissipation has a good amount of importance especially at high speeds, but the larger rotor does create more leverage for the caliper.