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281-31520-K006
| Freehub Body Type | Material | Part Number |
|---|---|---|
| Shimano HG | Alloy | 281-31520-K002 |
| Shimano HG | Steel | 281-31520-K001 |
| Shimano HG-R (11/12-Speed Road) | Alloy | 281-31520-K006 |
| Shimano Micro Spline | Alloy | 281-31520-K007 |
| Shimano Micro Spline | Steel | 281-31520-K008 |
| SRAM XD | Alloy | 281-31520-K004 |
| SRAM XD | Steel | 281-31520-K003 |
| SRAM XDR | Alloy | 281-31520-K013 |
| Campagnolo N3W | Alloy | 281-31520-K016 |
This Microspline free hub was exactly what I needed to convert my older HG fat bike hub to a 12-speed drivetrain.
I have 4 sets of Mulefuts for my 2 fat bikes. 2 sets knobby, 1 studded, 1 gravel.
Pros:
Rims can be pounded back into shape after rock hits.
Not too expensive.
Cons:
Bearings suck. Especially the free hub ones. They last a year if you’re lucky then go south.
Rim splits and leaks at the spline joint. Has to be JB welded or similar to fix.
The stock rear alloy axle WILL fail on you. May as well order the replacement steel one now.
Summary:
They do the job but need maintenance and don’t last. Flawed rim joint.
Both inner bearing disintegrated before 65 hr of use and had to replace freehub. Checked new freehub after 30 hr and both inner bearings disintegrated. Wheel at shop and hopefully they can fix with three new bearings. I’m suspecting that the original inner bearings are very poor quality. Bike isn’t even a year old.
I had to order a new SRC alloy microspline freehub as two of the internal cartridge bearings completely failed. The bike is just 2 years old and had 3297 miles on it. I do not jump, race, ride through water or even ride downhill. It was just complete destruction of two of the cartridge bearings inside the hub. I had to replace the hub and the alloy axle. That is a very short life for a freehub.
It would be nice if Hayes would offer the same warranty (2years) in the United States as they do in Europe.
The hub worked well but I cannot recommend something that fails when an 80 year old 165Lb man riding in Florida can destroy it.
If Hayes has knowledge of bad or inferior bearings then they should step up to the plate, contact me and replace the items.
I was not sure of the correct specifications on my bike Freehub ,after an email with Hayes did received a promptly reply with the part number that will fit
SUN-RINGLER SRX 148 the process was very smooth, the new part fit and work correctly.No issues with the installation or part, really appreciate the HAYES good service.