Into every cyclist's life, a flat tire or two will come. Be prepared by keeping an extra inner tube on hand. You'll also make some friends along the road if you're the one who comes up with an extra tube for a fellow rider who gets a flat. These tubes fit V7, V3, C7, C3, A7 & J7 PUBLIC bikes or any standard 700 x 35c to 700 x 40c tires.