A replacement 12 mm rear thru axle with 1.0 mm thread pitch that lets a thru axle bike clamp into a wheel on resistance trainer. Robert Axle Project part TRA226.

What it's for

Wheel on trainers clamp the bike by the ends of the rear axle. A stock thru axle has nothing for the trainer to grip, so this axle replaces it and adds ends that stick out past the frame for the trainer cups. Robert Axle Project names 1up, Blackburn, Cyclops, Kinetic, Tacx, and Wahoo trainers, among others.

How it works

Extended ends: The axle ends extend 15 mm beyond the frame on each side to give the trainer something to clamp.

Spacers: Spacers are included so one axle covers more than one frame length.

Install: It threads in like your stock axle and tightens with a 5 mm hex key.

Compatibility

• Axle: 12 mm rear thru axle with 1.0 mm thread pitch.
• Drivetrain: Compatible with SRAM UDH and Transmission, per Robert Axle Project.
• Trainer width: Because the axle adds 15 mm per side, confirm your trainer opens wide enough before ordering.
• How to check yours: You need three numbers from your stock axle: diameter, overall length, and thread pitch. Thread pitch is often printed on the axle. Robert Axle Project's site has an axle finder by bike model.

Specs

• Diameter: 12 mm
• Thread pitch: 1.0 mm
• Length: 175 or 183 mm (per product title; see note on the product page for exact fitments)
• Material: 7075 aluminum, CNC machined, hard anodized
• Weight: 0.225 lb
• Tool: 5 mm hex key
• Part number: TRA226
• Made in: USA (designed, built, and tested)