Ive bought a pair of 2.3in wide tioga tyres in a jan sale to replace my 2.1's the back tyre rubs ever so slightly on the rear chainstay when ridden fast over bumpy ground (especially downhill). If the chainstays were wider by 1 or 2 millimetres it would pass no problem. Is it possible to fit a 1mm spacer on either side of the wheel axle so that when retightening the qr skewer it keeps the stays out just that bit more so that the tyre clears. Or will this cause unesesarry stress to the frame. Or should i just flog them on and buy a new pair of 2.1's. (its a hardtail 1990 stumpjumper) Thanks in advance for any help.
