Cst Inner Tube 27X1 1/4 Dv Bicycle Valve (37/45-622-630)

CST Inner Tube 27x1 1/4 DV Bicycle Valve (37/45-622-630) CST Bicycle Inner TubeInner Tube Size:27” x 1 1/4 (622-630 x 37-45)Wall Thickness:0.9 mmWeight:205 gValve:DV 35 mmDV valve, also known as the Dunlop valve - Dunlop is also known as the bicycle valve, Woods valve, or English valve - a valve used primarily on children's bikes.

ETRTO is the European Tyre and Rim Technical Organization. The ETRTO size is the best size to check if the inner tube you're buying is the same size as the one you currently have on your bike. These are numbers written on the tire in the same format as the postal code, for example, 32-622. This means that The tire is 32mm wide and fits a 622mm rim. Therefore, the inner tube we're looking for must have a diameter of 622mm and a width appropriate for our tire.