Rubbing Sound

[jowwy]

I have new giant defy 4 - two weeks old

but i have switched out the 32hole giant wheels for my shimano r500's, but underload, especially while seated on short, sharp hills when trying to put the power down i here a rubbing sound on the drive side

what could be causing this problem??

i weigh 220lbs, but i have had these wheels on my raliegh sprint for 12months with no problems, but the raliegh does have a clearance for larger tyres (28mm).

Could it be that the wheels are flexing underload and rubbing on the brake blocks??

Thanks

 

[defy-one]

Could it be that the wheels are flexing underload and rubbing on the brake blocks??

could be

 

[Cubist]

Yes.

 

[jowwy]

its only happening in the lowest two gears and when i need to put the power down on really sharp climbs

i have a climb which i have to do virtually from a standing start as its a tight go back on yourself hairpin bend, when i drop to the 2nd lowest gear and put in a hard grind it rubs, later on in the climb when i'm spinning it dissappears

 

[gbb]

R500s are known to be flexy...when i first got mine, if i gave it beans out of the saddle on a hill, you'd hear the wheel magnet hit the sensor as the wheel flexed.

 

[Gary E]

disconnect the rear brake (temporarily) and try the hill again (open up the quick release on the brake or just remove the brake pads). That way you can eliminate/confirm your idea.

 

[jowwy]

i'm going to run the giant s-r2 rear wheel with 32h rim and see what happens then, if no rubbing then i'll keep them wheels on the bike and put the r500's on the turbo trainer instead