700c 45/65/85mm Lightweight Bicycle Inner Tube Presta Valve Road Bike Inner Tire Cycling Accessories

--cannot be inflated a lot when it is not installed in the out tire, otherwise it will cause irreversible damage!

--Before installation, inflate slightly to check for air leakage

--When installing, first inflate 0.5PSL, make sure that the inner tube is close to the inner wall of the tire when inflating, and then press and adjust the inner tube

--If the vacant inflation exceeds 6PSI, the inner tube will expand beyond repair

--Remember that it is strictly forbidden to exceed 6PSl in empty play