Are All 700c Rims The Same Dia.

[speedy_gt]

I ask because I am looking at buying some new tires and I have seen 700-20, 700-23, 700-26. What is the difference in the 20-26.

[boudreaux]

I ask because I am looking at buying some new tires and I have seen 700-20, 700-23, 700-26. What is the difference in the 20-26.20 23 25 is nominal tire width.