Our XMR T (Cross/Mountain/Road – Tandem) hub is a tandem-specific version of our XMR 6 bolt disc hub. Spaced at the 145mm quick release standard many tandems use, we designed a custom hub shell with tandem-specific flange spacing and beefed up cro-moly steel axle to handle the extra load. Made in our shop from U.S. sourced 6061-T6 aluminum, they’re available in a range of drillings and 4 different freehub body options.

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 and 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.

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):
  • 10mm x 145mm QR

Wheel Building Specs

• Standard J-Bend spokes

Bearings

Compatibility

• Axle options:
  • 10mm x 145mm QR
• 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

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