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Trainer Caps allow thru-axle bikes to be used with most wind, magnetic or fluid cycling trainers.

Cold weather and short days are never far from a Minnesotan’s mind so Wolf Tooth engineers created Trainer Caps to reduce barriers to winter workouts. Non-drive side axle caps are joined by drive-side plugs that can be installed or removed without tools to make the prospect of hopping on the trainer a little more bearable.  


  • Wolf Tooth Rear Axles (not compatible with rear axles from other manufacturers)
  • Not compatible with the following Santa Cruz bikes: UDH Bikes, Nomad 2014–present, Hightower 2016–present, Blur 2018–present, 5010 2013–present.

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Tech Specs

Weight 12g
Material 6061-T6 aluminum
Tool Interface P lug has O-ring retention – no tool required |  Axle cap requires 8mm hex key
Designed and Manufactured in the USA

WARNING Handling this product will expose you to chemicals, including lead, known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling. For further information go to