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ThuleThru-Axle Adapter
$59.95 - $74.95

Item # THU0321

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  • One Color, 15mm ($59.95)
  • One Color, 12mm ($59.95)
  • One Color, 20mm ($59.95)
  • One Color, Boost, 15x110 ($59.95)
  • One Color, Lefty ($74.95)
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Item # THU0321

Bigger bikes deserve bigger attachment points.

The Thule Thru-Axle Adapter allows you to mount larger front suspension forks on existing Thule and other fork-mounted (tray) bike carriers. The durable welded steel body supports your front forks.

  • 20mm thru-axle bike compatible
  • Works with any brand
Tech Specs
Tech Specs
fork-mounted bike racks
Recommended Use
mountain bikes
Manufacturer Warranty
limited lifetime

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Unanswered Question

What are the dimensions of the 12mm version ? Trying to fit to a 12mm x 142mm specialized diverge

Gotta have it/Roof rack

  • Familiarity: I've put it through the wringer

If you are putting your bike on an old school Yakima rack, then you have to have one of these. We have both the Lefty and the 15mm and they work like a charm.

Going strong

    Like others I think it's too bad that this doesn't lock the axle for security. But a cable lock fills that need without issue. It does swivel a bit if you don't have your skewer Hulk tight. I do like the smooth feel of he plastic inserts. I'm not sure you could have a locking feature at this price point.

    Going strong

    Quick Fix

    • Familiarity: I've used it several times

    With 3 new through axle bikes in our quiver, our Thule fork mount trays needed updating or replacing. Since I own QR mounted wheels I wanted to simply adapt a something that was easy and simple. The Thule Thru Axle Adapter works great! Easy to install on the forks and to engage with my current QR set up on the roof. The only missing feature would be a lock system, but with an optional locking core on the fork mount tray, all set for security and deterrence. Bought two to cover both mounts on the roof.

    Much needed!!!

    • Familiarity: I've used it several times

    If you have a 15mm fork adapted bike rack this is much needed. My only gripe is that most racks lock on the fork, which means that the bike is not secured but the adapter is. Thief gets the bike, you have the adapter.


    • Familiarity: I've used it once or twice and have initial impressions

    Haven't used it much yet. Seems well built. Really no alternative if you're using a fork mount rack like in a truck bed.

    Must have item

      Ya gotta have one for the roof rack if your 20mm thru-axle won’t mount on your QR-mount bike rack. This is my 2nd one, well made just showing a little rust on the welds but still sturdy!

      Necessary evil

      • Familiarity: I've used it several times

      I had to pick one of these up to work with my Yakima Forklift rack. It does the job and holds a 15mm fork very securely. It's very easy to set up and use, but would be nice to see a cheaper option or one that allows you to lock your bike down. Paired with the Yakima rack, I can lock this adapter to the rack but can't lock the fork to the adapter without throwing a cable lock around the whole mess.

      Bottom line - this works great and is completely necessary, but is possibly the least sexy piece of gear I've spent $$ on in my life.

      You've had success with this holding a 15mm as well as a 20mm?

      My bike has a 15mm axle so I ordered the 15mm adapter. It's a snug fit and definitely wouldn't fit a 20mm axle. I'm sure you could get a 15mm axle into the 20mm adapter, but I suspect that you would get a good bit of wobble in the set up, especially at highway speeds. I've never tried that route and I'm not sure I would recommend it. I think you're best off to get the adapter (15mm, 20mm, or lefty) that matches up with the axle size you have on your bike.

      Thru-Axle Adapter

      • Familiarity: I've put it through the wringer

      It works like its suppose to, but $40 for something this simple ? I needed 4 so it adds up quick! I guess I'm forced into it if I have all 15mm axles on my mtb's.....

      Works as advertised.

        I got the 15mm version of this to attach a Rocky Mountain Altitude 50 to my buddy's Rocky Mounts TieRod Bike Mount. It works just like I thought it would. My friend has a Rocky Mounts thru-axle adapter and it was a lot more expensive than this one. However, unlike this adapter, it allows you to still lock the bike to the rack. If that were possible with this one, it would have 4 or 5 stars.

        I know this review is old but, I had to comment concerning Rocky Mounts thru axle adaptor. It is heavy duty and does lock. However, it just doesn't work! When I put this on my Rocky Mount Pitch Fork rack, the bike was not stable . I had to use the 15mm adaptor that was included. The bike rolled extensivly backward and forward. The thru axle could not be tightened enough to the rack and the bike axle could not be tightened enough to the thru axle. I'll try the Thule thru axle adaptor and hope all tightens enough.

        Anybody interested in this adaptor should read EXACTLY what KENNETH P wrote above me. All these adaptors (Thule, RockyMount, Hurricane, etc) all have the exact same engineering design where it's impossible to not get the adaptor to rotate forward/backward when driving. They all stink, I've tried them all.