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Robert Axle Project Kid Trailer 12mm Thru Axle Length 152 167mm Thread 1.0mm ModelNumber=K3521 }Shimano Tiagra BR-4700 Road BrakeRobert Axle Project Kid Trailer 12mm Thru Axle Length: 152 or 167mm Thread: 1. 0mm. The Kid Trailer Thru Axles allow users to attach a hitch mount style trailer to any thru axle equipped bike. Machined and tested in the USA the Kid Trailer axles are designed for maximum strength and ease of use. For use with hitch mount style trailers common with child carriers such as Thule Chariot Burley InStep Croozer and more Stainless steel axle end provides an