Shimano RT-MT800-SS Rotor - 140mm | Center Lock

Shimano RT-MT800-SS Rotor - 140mm | Center Lock Shimano

Shimano RT-MT800-SS Rotor - 140mm | Center Lock

Shimano RT-MT800-SS Rotor - 140mm | Center Lock

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Why Do XT Riders Choose the Shimano RT-MT800-SS Rotor?

The Shimano RT-MT800-SS is the 140mm Deore XT center lock disc brake rotor built on Shimano's ICE TECHNOLOGIES FREEZA platform, the brand's highest-performing heat management construction. FREEZA rotors use a three-layer stainless-aluminum-stainless sandwich structure with an extended inner aluminum layer that reaches outward as a wide radiator fin, dramatically increasing heat dissipation during sustained braking. The result is 100°C lower rotor surface temperatures compared to standard stainless steel rotors, translating directly into less brake fade, more consistent feel, and quieter operation on long and technical descents where heat accumulates fastest.

The CENTER LOCK spline mount and lock ring system makes installation and removal faster than 6-bolt designs, requiring only a lockring tool rather than six separate bolts, and delivers precise, rattle-free rotor positioning with no alignment variation. The 140mm SS (small) size is designed for front or rear use on trail and XC setups where a lighter, more compact rotor is appropriate, or as a rear option paired with a larger front rotor for a split-size setup. The RT-MT800-SS is the correct OEM rotor for Shimano XT M8000 and M8100 hydraulic disc brake systems running center lock hubs.

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Specifications

  • Model: RT-MT800-SS
  • Series: Shimano Deore XT
  • Size: 140mm
  • Mount: Center Lock
  • Construction: ICE TECHNOLOGIES FREEZA -- 3-layer stainless-aluminum-stainless with extended radiator fin
  • Heat Reduction: 100 degrees C lower than standard stainless steel rotors

FAQ

What is the difference between ICE TECHNOLOGIES and ICE TECHNOLOGIES FREEZA?

Both use the 3-layer stainless-aluminum-stainless sandwich structure, but ICE TECHNOLOGIES FREEZA adds an extended inner aluminum layer that protrudes as a wide exposed radiator fin, significantly increasing heat dissipation capacity. The RT-MT800-SS uses FREEZA -- the higher specification.

Can I use the RT-MT800-SS on a 6-bolt hub?

No. The RT-MT800-SS is a Center Lock rotor and requires a Center Lock-compatible hub with an ISO spline mount. A center lock to 6-bolt adapter is available separately if needed.

Is 140mm large enough for trail riding?

It depends on rider weight, terrain, and riding style. 140mm is commonly used as a rear rotor in trail setups, or as front and rear on lighter XC-oriented builds. Many trail riders run 160mm front with 140mm rear. Consult your brake manufacturer and consider your terrain.

Best For

XC and light trail riders running Shimano XT M8000 or M8100 Center Lock hydraulic disc brakes who want the highest-spec Shimano heat management in a compact 140mm rotor for rear use or weight-conscious front builds.

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