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Thru-Axle Adapter

3.4 out of 5 stars
5 Reviews

Style & Size:


Thru-Axle Adapter

Thule's Thru-Axle Adapter future-proofs your rack with several size options to suit your current bike. Where the stock fork-mounted rack may only suit quick-release skewers, the thru-axle adapter works with 12mm, 15mm, boost, and 20mm thru-axle forks. The durable welded steel body supports your bike as you ferry from home to trail.


  • Adapter to future-proof your fork-mount bike rack
  • Options for most standards of thru-axles, including boost spacing
  • Item #THU0321
fork-mounted bike racks
Recommended Use
mountain bikes
Manufacturer Warranty
limited lifetime

Overall Rating

3.5 based on 5 ratings

Review Summary

1 Stars - 1 reviews
2 Stars - 0 reviews
3 Stars - 1 reviews
4 Stars - 2 reviews
5 Stars - 1 reviews

What do you think about this product?


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1 out of 5 stars

July 17, 2022

Great idea but missed the mark

As much of a fan of this idea as I still am I just couldn’t stick with it. I wasn’t able to tighten it down enough, nor could I lock my bike tube for security. It also is a shame that this had to be added to the bike attachment making it even taller and more wobbly. This product needs to be an independent piece that can attach to the bar frame and have a lock. If this would happen I would buy the new one and bring the bar out of storage.


Originally reviewed on manufacturer

4 out of 5 stars

April 7, 2021

How to fix long axle lengths on adapter

Bought the 15 mm to allow my new MTB fit my old Thule tray. Problem was the Fox 36 suspension was significantly wider than the adapter. This meant the whole bike could shift back and forth around the axle. So I added some washers to take up the slack. Maybe Thule could include something like washers or more clever to take up slack?

user image

Originally reviewed on manufacturer

3 out of 5 stars

March 3, 2020

Solid Construction But Missing Lock

Easy to install and solid construction but no way to lock the bike to the adapter as with others of this style (e.g., Rocky Mountain)

El Conejo

Originally reviewed on manufacturer

5 out of 5 stars

March 3, 2020

I would buy this if I need it again

Someone stole part from Bike rack, I purchased new parts to replace.


Originally reviewed on manufacturer

4 out of 5 stars

March 3, 2020

Well built and simple.

It would be nice if Thule decides to add an adaptable cup upgrade for the existing adapter so that it will accommodate 110mm width boost standards. It would require a simple change of one or more cups on the spindle. Include both!


Originally reviewed on manufacturer