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View Full Version : What's the reason for a bent back rotor?


Sammy12
21st August 2009, 00:22
Didnt realise till it was pointed out-i have a bent back rotor!
Just wondering what could have caused it?
I've only had the bike a few months, so im only just getting to grips with the "must check before purchases". *duh*!!:stupid:
TOTO
21st August 2009, 00:38
how about an emergency braking excersise ?
MSTRS
21st August 2009, 09:37
Could be lots of reasons. Most common is overheating, and then cooling down when stopped. The caliper retains heat on that part of the disc, which sets up stresses in the metal, causing warpage.
Could also have suffered a knock or something. Perhaps a hamfisted tyre change.
quickbuck
29th August 2009, 23:36
. Perhaps a hamfisted tyre change.

Most likely cause...
The back rotor only has about 10% of the energy the front ones get put through them.....

So, my guess is that the wheel has fallen to the floor while it was off the bike.
OR, the rim was stood on while the tyre was levered off...
Or, the rim went flying when it got popped out of the tyre....

Rear disc rotors hardly ever wear out. I'm sure a good second hand one can be found easily....
MSTRS
30th August 2009, 10:41
Most likely cause...
The back rotor only has about 10% of the energy the front ones get put through them.....

So, my guess is that the wheel has fallen to the floor while it was off the bike.
OR, the rim was stood on while the tyre was levered off...
Or, the rim went flying when it got popped out of the tyre....

Rear disc rotors hardly ever wear out. I'm sure a good second hand one can be found easily....

And they be cheap (compared to fronts)
quickbuck
30th August 2009, 11:42
And they be cheap (compared to fronts)

And you can make them out of aluminium apparently :whistle:

now I'm going to wait for the visitors to the pit garage at round 5...

Disclaimer : DO NOT MAKE DISCS OUT OF ALUMINIUM FOR A ROAD BIKE!
CookMySock
30th August 2009, 16:58
Disclaimer : DO NOT MAKE DISCS OUT OF ALUMINIUM FOR A ROAD BIKE!s/Disclaimer/WARNING/

Steve
R6_kid
30th August 2009, 17:05
could possibly have had some numpty try to ride off with the disc lock still in it - that's usually pretty good at munting brake discs.
quickbuck
30th August 2009, 20:14
could possibly have had some numpty try to ride off with the disc lock still in it - that's usually pretty good at munting brake discs.

Yup...
Must have been a real munter to put the lock in the rear disc....
But then there have been stranger things happen at sea.
quickbuck
30th August 2009, 20:16
s/Disclaimer/WARNING/

Steve

Well.... I hardly ever touch the thing personally... Just at car park speeds.

front on the other hand.... Well, arguably too much!