Robert Axle Project Lightning Bolt-On Thru Axles. Features: Lightweight thru axles, providing a better alternative to stock axles Low profile design with a clean appearance Machined to the high standards in the industry Not compatible with trailers or trainers Use The Robert Axle Finder to find the exact right axle When multiple axle lengths are listed, the axle includes a spacer. The two lengths are with and without the spacer Designed, tested, and made in Bend Oregon Specs: Front Rear:rear Description:12mm Lightning Thru-Axle Brand Fitment:various Axle Length:174mm Thread Pitch:M12x1.75