Surly Excellent Adventure Rear Trailer Thru Axle - 12x148mm Black. The Surly Excellent Adventure Thru-Axle is a 12mm bolt-on thru-axle designed for hauling Surly’s Bill and Ted cargo trailers with your bike. If your bicycle is equipped with a boost 148 12mm thru-axle hub and you feel compelled to haul cargo your Excellent Adventure awaits.

12 x 148mm hub compatibility only

Designed for use only with Surly’s Bill and Ted Trailers

Works with slotted horizontal or vertical single-position dropouts

Compatible models: Karate Monkey Krampus Grappler Ogre Lowside ECR Troll and Skid Loader