CyclingDeal Trainer Thru Axle - Bike Bicycle 12mm Rear Wheel Skewer for Indoor - Length 166mm to 178mm Boost -Thread Pitch: M12 x P1.5 - Spacers 2.5mm/6mm/tapered 7.5mm Included

Size is perfect to my canyon thru bolt axle. I used this constantly with my trainer whenever I am not on the road. Excellent, highly recommended

Worked perfectly in my 2020 Quintana Roo PR 5 disc brake bike. I was on the trainer with it changed out in seconds.

This isn’t a one size fits all. So be certain of what size you need. But product works as intended for one of my bikes on a I door trainer .

If you are trying to determine if this through bolt matches yours, try taking the throughbolt out. It may have the length, diameter, and thread pitch printed on the bolt like mine did. I ordered the intermediate size that covered the 174 mm of my bolt length. I had to use the smaller washer to get a perfect length. It barely fit the Sarus II fluid it trainer, but it fit. Sarus adapters have a shorter draw bar but will not fit my bike. I will probably grind the width of the washer off the bolt and reinstall so it's a little easier to put in the trainer but this got me riding the trainer in less than 5 minutes and it's rock sold because its snug with the frame. I have a 650B wheel on with a 2.4 tire. The tire almost touches the floor. There is no problem with my tire size but I am ordering a 650 B 2.0 trainer tire to get a flatter, harder compound on the wheel Otherwise I am going to ruin a perfectly good and expensive tire in a week and have to vacuum rubber compound out of the carpet.

It’s does what it’s supposed to.