Surly Thru-Axles are low-profile, bolted Thru-Axles are specifically designed for use with Surly thru-axle compatible frames. Offered in several sizes, for both front and rear wheels. 

12x142/148 Rear Thru Axle: 

• Designed for frames with Surly Gnot Boost spacing (145mm), capable of working with 142 or 148mm rear hubs
• Fits: Karate Monkey, Krampus, Troll, Ogre, ECR