Probably an obvious question, but if you're using XDR, have you removed the spacer? if You're using an XD driver, do you have the spacer installed?

---

Tech writer/support on this here site. FIST school instructor and certified bike fitter. Formerly at Diamondback Bikes, LeMond Fitness, FSA, TiCycles, etc.
Coaching and bike fit - http://source-e.net/ Cyclocross blog - https://crosssports.net/ BJJ instruction - https://ballardbjj.com/

I'm using the XD/XDR hub body that Wahoo sells and Saris confirmed it would work. But I'm confident the problem is with the way the hub body itself is interacting with the trainer and the end cap. I have the issue without the cassette even on.

Uh... ok. What about that spacer question?

---

Tech writer/support on this here site. FIST school instructor and certified bike fitter. Formerly at Diamondback Bikes, LeMond Fitness, FSA, TiCycles, etc.
Coaching and bike fit - http://source-e.net/ Cyclocross blog - https://crosssports.net/ BJJ instruction - https://ballardbjj.com/

I'm not using a spacer. But that isn't the issue. When I put the XDR hub body on the trainer spindle, and tighten down the end cap, the hub body cannot move.

Are you using an XD driver, or an XDR driver?

---

Tech writer/support on this here site. FIST school instructor and certified bike fitter. Formerly at Diamondback Bikes, LeMond Fitness, FSA, TiCycles, etc.
Coaching and bike fit - http://source-e.net/ Cyclocross blog - https://crosssports.net/ BJJ instruction - https://ballardbjj.com/

I'm using the XD/XDR driver from Wahoo.

Sorry, I'm multitasking here.

What cassette are you using, XD or XDR?

---

Tech writer/support on this here site. FIST school instructor and certified bike fitter. Formerly at Diamondback Bikes, LeMond Fitness, FSA, TiCycles, etc.
Coaching and bike fit - http://source-e.net/ Cyclocross blog - https://crosssports.net/ BJJ instruction - https://ballardbjj.com/

I'm using an XDR, Rival AXS 10-36.

what happens if you put the cassette spacer back on?

---

Tech writer/support on this here site. FIST school instructor and certified bike fitter. Formerly at Diamondback Bikes, LeMond Fitness, FSA, TiCycles, etc.
Coaching and bike fit - http://source-e.net/ Cyclocross blog - https://crosssports.net/ BJJ instruction - https://ballardbjj.com/

It won’t make a difference. I’m not sure you are understanding what I’m saying. The issue I’m having is before the cassette is even on.

When I hand tighten the end cap onto the trainers spindle, it pushes in on the driver to a point where the driver can no longer move. A cassette spacer isn’t involved in this equation.

I wasn't :)

DO you have the shorter end cap on the drive side?

How tight is "hand tight"? What happens if you thread the cap(s) on less tightly?

---

Tech writer/support on this here site. FIST school instructor and certified bike fitter. Formerly at Diamondback Bikes, LeMond Fitness, FSA, TiCycles, etc.
Coaching and bike fit - http://source-e.net/ Cyclocross blog - https://crosssports.net/ BJJ instruction - https://ballardbjj.com/

The H3+ doesn’t come with a shorter end cap, so far as I know.

So, there is a distinct point where it starts binding. If I back slightly off, where the hub body seems to spin freely, I worry that it isn’t safe or being properly tightened.

And when I do it with the stock Shimano HG hub body, I can fully hand tighten and there is no binding of the free hub.

I looked at the spindle, and there is a clear stop after the threads end. With the stock Shimano hub, I believe the end cap is hitting that stop, with the XDR driver, I don’t think it’s getting to the stop, so it is binding the hub body.

try swapping the end caps around.

---

Tech writer/support on this here site. FIST school instructor and certified bike fitter. Formerly at Diamondback Bikes, LeMond Fitness, FSA, TiCycles, etc.
Coaching and bike fit - http://source-e.net/ Cyclocross blog - https://crosssports.net/ BJJ instruction - https://ballardbjj.com/

Like I said, I don’t believe it comes with a shorter or any different type of end cap.

Would it kill you to try it?
Parts list has l&r endcaps listed for all axle types, just fwiw.

---

Tech writer/support on this here site. FIST school instructor and certified bike fitter. Formerly at Diamondback Bikes, LeMond Fitness, FSA, TiCycles, etc.
Coaching and bike fit - http://source-e.net/ Cyclocross blog - https://crosssports.net/ BJJ instruction - https://ballardbjj.com/

I’m not sure what list your are looking at. The one I’m looking at shows the end caps are drive side or non drive side specific.

The caps are different lengths for drive and non drive side. Is it possible you have them reversed?

---

Tech writer/support on this here site. FIST school instructor and certified bike fitter. Formerly at Diamondback Bikes, LeMond Fitness, FSA, TiCycles, etc.
Coaching and bike fit - http://source-e.net/ Cyclocross blog - https://crosssports.net/ BJJ instruction - https://ballardbjj.com/

I am using the correct end caps.

I don't know how you got Saris to confirm a Wahoo body would fit, but it does not. You need a XD/XDR body from Saris to make it work

---

Disclaimer: I have made a living in bike shops for more than 2 decades, so according to most people on this forum am not at all trust worthy

I didn’t “get” them to confirm it. They confirmed it. Obviously you can’t tell in a picture, but they look exactly the same. I’ll double check with them. Do you know that they are differently sized/spec’d?

I am sorry for my tone in that reply to you. I did not mean to imply you did anything wrong when communicating with Saris. With English being a 3rd language to me unfortunately my tone will often be off.

I actually probably could tell if there is any differences between the bodys if you took a picture of them side by side. I have changed enough bodyss in my life to know what differences to look for. I will not claim that i know for certain they are incompatible as I haven't yet changed body on a h3+

However all Saris bodys I have changed had at "tophat" spacer between trainer and body whereas all Wahoo bodys used a straight spacer. At the same time all Saris bodys I have seen were 3 pawl whereas Wahoo have been 4 pawl. when you yourself say the bodys are different height. I still believe my first claim was right they are not compatible.

i think somebody at Saris misread your question

---

Disclaimer: I have made a living in bike shops for more than 2 decades, so according to most people on this forum am not at all trust worthy

My apologies too. As soon as I posted, I thought a little and with the username thought English may be a second language. Just frustrated with the situation!

You may very well be right. I emailed them to confirm but have received a response yet. I don’t have the saris one on hand, so I don’t know if it’s different height than the wahoo one I have. I’m just looking at pictures myself. I am now seeing a slight difference on the internal side of the hub body that could be making the difference.

You would not need the Saris XDR one to tell the difference. Just the Wahoo XDR and the Saris 11sp you took off the trainer. Picture upside down or internal/pawl side up whatever you would call it, and then side by side we could probably tell if there is any incompatibilities.

---

Disclaimer: I have made a living in bike shops for more than 2 decades, so according to most people on this forum am not at all trust worthy

Oh they are definitely different lengths.