Originally Posted by
jimmuller
First, check the DO alignment. Second, check the alignment of the DOs. Third, make sure your DOs are aligned. Depending on how good or bad it was originally, those extra 4mm could have made it worse enough to matter.
Fourth check that your axle is positioned okay in the hub so that it doesn't stick out too far to one side. If it was originally set up for a bike with a claw for the RD and you are putting it on a bike with forged DO and an integrated hanger, it may be too long on the DS.
Fifth, make sure your skewer isn't badly bent.
+1
If you're spreading a 126 to fit a 130, the dropouts aren't parallel. Now some % of the force of your quick release is used to make them parallel. If they're parallel, all that force translates to friction on the hub.
I'm assuming your frame is steel, based on the 126mm spacing? If so, any competent LBS should be able to do the job.