XMR+ Boost Rear
$426.00 – $451.00Price range: $426.00 through $451.00
Our XMR+ (Cross/Mountain/Road) Boost hubs are designed around the ISO 6-bolt rotor mounting interface as opposed to the Center Lock mounting standard used on our CLD hub. The Boost spacing allows for wider hub flange spacing which results in better spoke bracing angles. Made in our shop from U.S. sourced 6061-T6 aluminum, they’re available in a range of drillings, colors, and axle configurations.
A question we always get about our disc hubs is, “CLD or XMR? Which is better?”. Neither is “better” than the other. Both share the same internals and the differences really come down to the respective designs having to accommodate the two different rotor mounting interfaces. Bottom line is you really can’t go wrong with either hub!
Most of the time choosing is simply a matter of which disc rotor system you already have on your bike, so your choice is kind of made for you. And if you’re building a new bike, it’s not a bad idea to stick with the rotor system you’re using on your other bikes, just in case you want to swap things around. And to add to it, Shimano and SRAM don’t offer all their rotor models and sizes in both Center Lock and 6 bolt, so be aware of that when speccing out your new rig.
Product Details
As with all our hubs, the XMR+ (Cross Mountain Road Boost) draws on over 30 years worth of hub manufacturing experience and real world testing, going back to the “Ti Cassette hub” we introduced in 1992. We’ve been doing this for a long time, and every White Industries hub we make has that original DNA in it; simple, durable, dependable.
The XMR+ is perfect for Boost spaced mountain and gravel bikes because of their low weight and clean, minimalist look, as well as their robust and durable design. Designed around the ISO 6 bolt rotor mounting standard, the core of the rear XMR+ is a heat treated, black-oxided 4130 steel axle with aluminum axle ends, rotating on four Enduro brand bearings: two in the 6061-T6 aluminum hub shell, and two in the 6/4 titanium freehub body. XMR+’s are made here in our Petaluma, Ca. shop, and available in four spoke drillings, seven colors, and five different freehub bodies.
What’s In The Box
- Complete rear XMR+ hub with freehub body
- Does not include extra freehub bodies
- Does not include Thru axle
- SRAM XD/XDR freehub body comes with 1.85mm cassette spacer for XD cassettes
- All other freehub bodies do not come with cassette spacers
Specs
- Hub shell is made from 6061-T6 aluminum
- Colors: black, blue, gold, pink, polished silver (not anodized), purple, red
- Finish: Polished, then anodized, with machine-engraved logos
- Freehub body is made from 6/4 titanium
- Enduro sealed radial carbon steel bearings
- Enduro XD-15 Ceramic bearing upgrade available
- Heat treated and black oxide 4130 steel axle with aluminum axle ends
- Adjustable bearing preload
- Heat treated steel 48 tooth drive ring that threads into the hub shell
- 48T (7.5 degree) freehub engagement
- 3 heat treated steel freehub pawls with stainless steel leaf springs
- Easily serviceable and rebuildable
- Weight: 306g
- Spoke drillings: 28, 32, 36, 40
- Interchangeable freehub bodies (requires purchase of a new freehub body)
- Axle options: 12mm x 148mm Thru
Wheel Building Specs
| Spoke Hole Diameter |
Left Flange Diameter |
Right Flange Diameter |
Center to Left Flange |
Center to Right Flange |
| 2.6mm |
60mm |
60mm |
36.5mm |
22.5mm |
Bearings
| Driver Style |
Left hub shell bearing |
Right hub shell bearing |
Inner driver bearing |
Outer driver bearing |
| Shimano Hyperglide 8-12 speed |
61902-LLU/LLB |
61902-LLU/LLB |
3802W LLB |
61902-LLU/LLB |
| Shimano Micro Spline |
61902-LLU/LLB |
61902-LLU/LLB |
3802W LLB |
3802W LLB |
| SRAM XD/XDR |
61902-LLU/LLB |
61902-LLU/LLB |
3802W LLB |
3802W LLB |
| Campy 9-12 speed |
61902-LLU/LLB |
61902-LLU/LLB |
3802W LLB |
3802W LLB |
| Campy N3W/EKAR 13 speed |
61902-LLU/LLB |
61902-LLU/LLB |
3802W LLB |
3802W LLB |
Compatibility
- Axle options: 12mm x 148mm Thru
- Can not be converted to 12mm x 142mm Thru axle
- Freehub Bodies/Cassettes (the 5 different freehub bodies are interchangeable):
- “Shimano HG 8-12 Speed” freehub bodies fit Shimano Hyperglide 8-12 speed cassettes (spacer not included for 8-10 speed cassettes and 11 speed mountain cassettes)
- “Shimano Micro Spline” freehub bodies fit Shimano Micro Spline cassettes
- “SRAM XD/XDR” freehub bodies fit SRAM XD and XDR cassettes (1.85mm spacer included for XD cassettes)
- “Campy 9-12 Speed” freehub bodies fit Campy 9-12 speed cassettes
- “Campy N3W/EKAR” freehub bodies fit Campy N3W/EKAR cassettes and Campy 9-12 speed cassettes with Campy AC21-N3W adapter
- Requires Requires 6 bolt style rotors
- Not compatible with radial spoke lacing
- Neither is “better”. Both share the same internals and the differences really come down to the two different rotor mounting standards: Center Lock for CLD+, and 6-bolt for XMR+. The bottom line is you can’t go wrong with either hub!
- This depends on the type of climate you’re riding in, and how often. To check the bearings, remove the wheel once a month and spin the axle with your fingers to check for roughness which would indicate a bearing/bearings need to be replaced. At least once a year pull the hub apart to inspect and clean/regrease the freehub body parts (pawls etc). In extreme conditions do this more often. In wet climates you can smear extra grease on the faces of the outer bearings to help protect them. For this, we like to use Sta-Lube Water-Resistant Marine Grease.
- We use Lubriplate brand No. 105 grease during assembly. Small, 10 oz tubes are sold as “Lubriplate No. 105 Motor Assembly Grease” at auto parts stores. This grease has a “NLGI #0” consistency which is similar to brown mustard (that’s how the grease scientists describe it). But any quality grease with the same consistency (or slightly thinner) will work. A small amount smeared into the teeth of the Ratchet Ring and in the pawl pockets of the freehub body is all that’s needed. Too much will interfere with the operation of the freehub pawls and cause skipping. You can also use Phil Wood Tenacious Oil or Dumonde Freehub Oil if you prefer a bit louder sound.
- Yes, but that would be a different model called the “XMR”. The XMR+ Boost (which is what you’re looking at on this page) can not be converted to a standard 142mm spacing.
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- You can swap from one freehub body to any of the others. Those are available on the Freehub Bodies page. If you are swapping to or from a Shimano Micro Spline freehub body, you will also need to purchase the appropriate axle kit on the Axle Kits page. Instructions are in the Rear Hub Assembly document, but it’s not a complicated procedure and does not require special tools.
- Use “Mothers Mag and Aluminum Polish” with a microfiber rag. Start with heavy pressure and lighten up towards the end.
- Unfortunately we do not offer those options.
