[skysig]

Hi guys,

i recently bought a Jamis Durango SX; haven'y been doing any heavy stuff with it, just simple regular XC.

Everything was fine for the first week or so, till I noticed white, circular lines on the brake side of the rear stay. I left it alone, thinking they were just scratches.
Recently, I noticed that the paint around "scratched" area has been burnt off, leaving a highly polished ring with blackened paint marks on the edges. The scratches only appear on the brake side, directly under the edge of rotor, and extend outwards for 20mm.

The scratches were not caused by removing the rear wheel; i placed a chainstay protector on the affected side; after a week or riding, the chainstay protector had abrasion marks around the same area too.

I'm stumped; any idea what may have caused this ?

 

[NC Riverrat]

If you haven't already tried this...

If you haven't already tried this...

Hold your bike steady by the seatpost or seat and grab the top of the tire and wiggle it side to side to see if there is any play (slop). If there is, your locknut is loose on the rear axel and you can take it in to get it repaired. (This is a common problem with shimano hubs)

It would have to be pretty loose to let the brake disc rub on the chainstay but stranger things have happened.

 

[skysig]

If you haven't already tried this...

Hold your bike steady by the seatpost or seat and grab the top of the tire and wiggle it side to side to see if there is any play (slop). If there is, your locknut is loose on the rear axel and you can take it in to get it repaired. (This is a common problem with shimano hubs)

It would have to be pretty loose to let the brake disc rub on the chainstay but stranger things have happened.

nah, no play, that's why i'm stumped too!