700 x 18c - 25c Bike / Cycle Inner Tube PRESTA Valve **BUY 4 GET 1 FREE** This listing is for one quality inner tube with presta valve. For every four tubes that you purchase, we will include an extra tube of the same size and type FREE OF CHARGE! Example - if you buy 4 you will receive 5, if you buy 5 you will receive 6, if you buy 8 you will receive 10 etc Fits Tyre Size: - 700c x 18c to 700c x 25c.