Originally Posted by
simongrant
Hi group,
I currently have 26x1 3/8 tyres on my comfort bike,does this mean all new tyres i put on have to be this same size?
Regards
Simon
Have a look on the tire for and ETRTO size. It will be a 2 digit number followed by a 3 digit number (47-559 or 23-622 for example). The first number is the width of the tire. This you can vary but is limited by the width of the rim (Sheldon's site has a good chart for this). The second number is the Bead Seat Diameter (where the tire hooks onto the rim). This number you must match exactly. No wiggle room here.