Asahi Cycle Aluminum 700c Exterior 6-speed Rear Wheel (Caliper Brake Specification) XBA75: This product is for caliper brakes, so it is not compatible with drum & roller brakes. Standard model for cross bikes compatible with 700x28~38c tires. Designed to ensure high strength as a W O aluminum rim. Size: 700c Valve hole: English American style Number of spokes: 36H Type: 6 speed transmission Shaft length: 192mm This is a rear wheel for exterior 6 stage boss free. Product model number: XBA75 Size: 700c Material: Aluminum Packing size: 64 x