XMRT Rear Tandem
$426.00 – $436.00Price range: $426.00 through $436.00
As with all our hubs, the XMRT (Cross Mountain Road Tandem) 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.
Product Details
As with all our hubs, the XMRT (Cross Mountain Road Tandem) 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 XMRT is a tandem-specific 6-bolt disc rear hub designed around the QR x 145mm axle spacing standard which is (mostly) unique to tandems. The hub shell is designed specifically around this axle standard and puts the disc rotor in the correct spot for the ISO 6 bolt rotor/caliper alignment standard. This is not simply a standard XMR hub with a wider axle! That would not work because the disc rotor would end up 10mm shy of lining up with the disc caliper.
The XMRT rotates on four Enduro brand bearings: two in the 6061-T6 aluminum hub shell, and two in the 6/4 titanium freehub body. XMRT’s are made here in our Petaluma, Ca. shop, and available in four spoke drillings, two colors, two axle configurations, and four different freehub bodies.
What’s In The Box
- Complete rear XMRT hub with freehub body
- Does not include extra freehub bodies
- Does not include QR skewer
- 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, polished silver (not anodized)
- 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: 344g
- Spoke drillings: 32, 36, 40, 48
- Interchangeable freehub bodies (requires purchase of a new freehub body)
- Axle options (interchangeable between the two, but only one comes with the hub):
Wheel Building Specs
| Spoke Hole Diameter |
Left Flange Diameter |
Right Flange Diameter |
Center to Left Flange |
Center to Right Flange |
| 2.6mm |
60mm |
60mm |
30.65mm |
23.25mm |
| 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 |
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Compatibility
- Axle options:
- Freehub Bodies/Cassettes (the 4 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
- Requires 6 bolt disc rotors
- Not compatible with radial spoke lacing
- 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 standard XMR (which is what you’re looking at on this page) can not be converted to a Boost axle/spacing.
- No. The XMRT hub shell only works with 10mm x 145mm QR axles
- 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.
