Easy DIY Wahoo Kickr Core + V4 QR Adapter

The Wahoo Kickr Core, Kickr V4, and newer models require an adapter for quick release bikes – but Wahoo no longer seems to stock this adapter kit. The only place it is available online is from a reseller on eBay who is taking in $300 for each sale of the $20 part Wahoo once sold. Pretty lame.

So rather than let your $1000 bike trainer become a pile of scrap, buy $20 of parts and make your own. It's stupidly easy.

Supplies

You need two things for this adapter kit: The first is a 12mm thru-axle to 10mm QR adapter that will set you back $10. The other is a spacer that fits over the adapter ($15 shipped with next-day delivery). (FYI: The QR adapter does not include a quick-release skewer)

For 135mm rear hubs:

12mm to 10mm 135mm Thru-Axle QR Adapter (https://www.amazon.com/dp/B08V8QS55Q?th=1&psc=1)
12mm ID, 19mm OD, 25mm Long Aluminum Unthreaded Spacer (https://www.mcmaster.com/94669a376/)

For 142mm rear hubs:

12mm to 10mm 142mm Thru-Axle QR Adapter (https://www.amazon.com/dp/B08V8NVMD4?th=1&psc=1)
12mm ID, 19mm OD, 30mm Long Aluminum Unthreaded Spacer (https://www.mcmaster.com/94669A377/)
12mm ID, 18mm OD, 2mm Long Stainless Steel Ring Shim (https://www.mcmaster.com/98089A449/)

For 148mm rear hubs:

12mm to 10mm 148mm Thru-Axle QR Adapter (https://www.amazon.com/dp/B08V8RR4GR?th=1&psc=1)
12mm ID, 19mm OD, 35mm Long Aluminum Unthreaded Spacer (https://www.mcmaster.com/94669A378/)
12mm ID, 18mm OD, 1.5mm Long Stainless Steel Ring Shim (https://www.mcmaster.com/98089A126/) (comes in a 10 pack, but you'll only need 2)

I've only tested this with the 135mm Rear hub width. I'm assuming this configuration for 142 and 148 will work the same way, though I make no guarantee of it. If you try this with your 142 or 148 hub let me know how it goes and I can update this.

Slide your Unthreaded spacer over the QR adapter on one side. For 142mm rear hubs, add one 2mm ring shim. For 148mm rear hubs, add two 1.5mm ring shims.

Insert your QR adapter from the non-driveside or left-hand side into the Kickr hub. Make sure to push your spacer fully into the hub. Align the 10mm QR portion of the axle with the edges of the spacers. It should be flush on both sides.

You may now attach your bike and secure it with a quick release lever. You are now ready to ride!

Legalese: This is an unsupported aftermarket modification to the Kickr. Wahoo might not support this. Maybe it will void your warranty. Who knows? That's all to say that I take no responsibility for any outcome, misuse, or damage. Do this at your own risk. But have fun!