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View Full Version : Racecar rotor racecaR

Brizn
September 9th, 2006, 02:42 PM
Quite often my rotors will start rubbing after a creek crossing...and I could never figure out why. Now I think I'm realizing that it's usually after a long downhill followed by a creek crossing, in which case the rotors are hot from braking, then submerged in cool water.....I'm wondering if this is warping 'em. Does this happen to others?

The rotors are probably pretty susceptable to it as they're a few years old and have been trued up numerous times.
CountZero
September 9th, 2006, 05:05 PM
Yes, you got it right. The problem is worse if your pads are touching the rotor as it's being cooled.
redneckp3ngu1n
September 9th, 2006, 06:44 PM
Wow im very amused by the title :D Its like backwards and forwards at the same time :eek: Yes the rotors are warping and if they have been trued several times they will warp even easyer because when you re-true metal it weakens slightly. Also make sure you didnt use a hammer when you trued them.
Brizn
September 9th, 2006, 09:45 PM
Right. Makes sense. I wonder why pad contact when submerging/cooling would make a difference, though.. I've solved the problem, I just won't brake on DHs anymore, simple. Crap no I don't true 'em with a hammer! I usually just lie my bike on its side and kick 'em real' hard :rolleyes:
redneckp3ngu1n
September 10th, 2006, 09:56 AM
Right. Makes sense. I wonder why pad contact when submerging/cooling would make a difference, though.. I've solved the problem, I just won't brake on DHs anymore, simple. Crap no I don't true 'em with a hammer! I usually just lie my bike on its side and kick 'em real' hard :rolleyes:

Pad contact usually pushes on the rotor and bends it slightly especially on mechanicle brakes. Add this to the heating and cooling and they will bend even easyer. Very wise choice on not braking. If you not on the ground bleeding it makes you faster. :D I know people who true rotors with a hammer and the pounding flattens the thickness of the rotor slightly which can make the rotor even more out of true and easier to bend.
skiandmtb
September 10th, 2006, 08:05 PM
Right. Makes sense. I wonder why pad contact when submerging/cooling would make a difference, though..
The pad contact also makes the cooling effect more uneven, causing density differences and further warping.
LJ