[RBW] Is this rim wear unusual

2010-08-13 Thread carnerda...@bellsouth.net
My 650B Sam Hillborne has Velocity Synergy rims and Shimano Deore V-
brakes with the pads that came on them. Since new the front wheel has
had a little tick with each revolution while braking.  I assumed this
was a slightly raised joint line that would flatten out with normal
wear.  Over the last two weeks I have had three12-15 mile rides on
gravel and chip seal roads which include some steep sections with
multiple pot holes and required heavy braking. Between these rides I
had the usual short commutes to work. I noticed that braking in the
front had become much more uneven to the point that firm application
of the front brake caused an unpleasant thump with each revolution.
I decided it was time to clean the braking surface.  When I did I
found the front rim to be fairly deeply scored and in a pattern where
the deepest scoring corresponds to each spoke hole. This is the same
on both sides of the rim.  The rear rim does not have this pattern. I
have never seen this and can't find mention of it on the internets.
The links below are to pictures I took to try to show the pattern.
Am I doing something wrong to cause this?  Should I change to
different brake pads?  Should I be worried about this?
http://www.flickr.com/photos/carner/4889788162/in/set-72157623654420644
http://www.flickr.com/photos/carner/4889790774/in/set-72157623654420644/
http://www.flickr.com/photos/carner/4889196607/in/set-72157623654420644
David

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Re: [RBW] Is this rim wear unusual

2010-08-13 Thread Tim McNamara
I would look at the braking surface of your brake pads.  From the  
looks of it, you've got bits of aluminum or other abrasive material  
imbedded in the pads.


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