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Post by mtbman on Jul 9, 2009 20:09:47 GMT
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Post by thistle on Jul 9, 2009 21:07:09 GMT
They can warp if they get too hot, but that's why they're full of holes and you have to be braking pretty hard for it to get that hot. Unless somehow the stresses from the heat have built up over time and suddenly gone ping now but it sounds a bit unlikely to me. (anybody know better?) Floating rotors are supposed to be better for resisting this, whether they are or not I can't say! All my rotors are bent, but only very very slightly. Probably from getting pranged by rocks and leaning my bike up against things. If it's only a small distortion and the material isn't too springy you might be able to bend it back into a usable state using a big adjustable spanner  or forking out for a rotor truing kit. You might be able to do something clever by heating it up in the oven to get it to relax back into shape, but the mrs probably won't approve! I think I've got some second hand 6 bolt rotors you can borrow if you really want your other wheel back. They're 160mm though and have a slight bend |
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Post by Oggy on Jul 9, 2009 21:07:40 GMT
Seems a bit strange for a rotor just to bend like that, seems that you are cursed mr mtbman  Bloody expensive hobby we have  |
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Post by thistle on Jul 9, 2009 21:10:21 GMT
along with a nice new set of brake pads for my front brake Oh hang on. Have the new pads caused the problem somehow? When I bolloxed by pads at Cannock the guy in the shop said the spring for the pads get all mangled first when the pads are worn out (as a sort of warning sign), and if I'd just carried on it might've damaged my rotor. |
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Post by mtbman on Jul 9, 2009 21:12:52 GMT
Thanks for the offer bud But I'll stick with the old wheel until I've got the reddies for a new rotor. I think I'll try the heating it up in the oven trick though. We've got a bearing induction heater in work that will really get her hot, I'll give that a go ;D Nothing to loose, might aswell let the fitters in work loose on it  If it does pop back into true, I think I'll stick it on the back wheel. I wouldn't trust it on the front Q: Are "Hope Floating Rotors" only good for Hope Brakes, or will tey run on any? |
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Post by Russ on Jul 9, 2009 21:57:08 GMT
All rotors have a tendency to go out of true, most steel is supplied in big rolls and as such the steel wants to retain/remember this shape, even more so if it's heated..
If you have not got access to a smegging great big press, then just get a big pair of pliers/mole grips and grip the rotor on the tangs and give them a tweak to put it back into shape. Do the tweak mostly on the tang nearest to the bend and a little less on the tangs to either side.. job done.. only takes a few mins to do.
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Post by danevs on Jul 9, 2009 22:17:05 GMT
I've seen threads like this on Bikeradar before regarding these discs. I'd say heat is an unlikely cause although it may be a contributing factor, more likely some sort of side load (misaligned pads/caliper or similar) which would only need to be tiny to affect the disc while under stress from braking. From what I've seen of them they're a little over-machined, especially in a 203mm format where you have far more stress than a titchy 160 which I think was the original target of the lightweight design.  I'd just get a standard Shimano, Avid type disc and save yourself the hassle (no doubt your braking performance will improve greatly as well, the pads can't grip the disc and do their job if 70% of material in the swept area has been machined away)  Hope that helps. |
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Post by thistle on Jul 10, 2009 12:21:19 GMT
Russ' point about steel being rolled is a good one. If you stick it in your induction heater it might bend a bit more back to the curve when i was on the coil Can you do baked potatoes in your heater? In like 10 seconds rather than 10 minutes? ;D |
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Post by kay2 on Jul 10, 2009 16:37:33 GMT
If the steel isnt that strong just the rotating force against the pads would be enough to bend the the disk.
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Post by Taffydoo on Jul 10, 2009 20:11:17 GMT
I bent a rota and a wheel. I drove over the bloody thing with out knowing. Staightened out the rota and got a few more rides out of it
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Post by mtbman on Jul 10, 2009 21:55:44 GMT
I bent a rota and a wheel. I drove over the bloody thing with out knowing. ;D ;D ;D |
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Neil
Grunt
Posts: 14
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Post by Neil on Jul 21, 2009 11:09:41 GMT
Has anyone else ever managed to bend a rotor. Or am I just cursed Hi Mate, Its my first post here usually hang out at the Bikeradar forum. The answer is yes. Ive got a 180mm ashima airotor that has also warped. I bought two back in July, the rear 160mm is fine. I bought mine from Merlin Cycles, I mailed them yesterday and was advised that I could return it. I didn't want to try and straighten the rotor as its still under warranty. I had previously been running Shimano rotors (RT61) for two years without a problem. I had wondered whether this is a common fault with Asima Airotors. |
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Post by willwild on Jul 21, 2009 22:06:45 GMT
I managed to bend my avid rotor, i just figured that it happens now and then.
Just used it as an excuse to upsize my rotor for a little extra braking!
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).
).
"Guess I must be trying then"
or forking out for a rotor truing kit. 
I'd just get a standard Shimano, Avid type disc and save yourself the hassle (no doubt your braking performance will improve greatly as well, the pads can't grip the disc and do their job if 70% of material in the swept area has been machined away) 
