Shimano XTR RT-MT900-SE - 140mm | Center Lock
What Is the Shimano XTR RT-MT900-SE Rotor and Who Is It Built For?
The RT-MT900-SE is Shimano's flagship XTR disc brake rotor in the 140mm center-lock format, built around a two-piece construction that combines a stainless steel braking surface with an aluminum carrier spider. This Freeza rotor construction uses a finned aluminum carrier to dramatically increase the surface area available for heat dissipation compared to a single-piece steel rotor of the same diameter. During sustained braking on long descents, heat buildup in the rotor is the primary cause of brake fade, as elevated pad and fluid temperatures reduce braking force and modulation. By routing heat from the steel braking track into the aluminum spider fins and dissipating it into the airflow around the rotor, the Freeza design maintains more consistent brake lever feel and pad bite across extended descents. The 140mm size is optimized for XC racing and lightweight trail builds where total system weight is a priority and the terrain demands high modulation over raw stopping power. The center-lock interface uses a standard Shimano lockring (sold separately or included with compatible hubs) for installation.
The RT-MT900-SE 140mm center-lock is designed for use with Shimano XTR and XT hydraulic disc brake systems and is compatible with any center-lock disc hub. The SE designation indicates the two-piece Freeza construction with finned aluminum carrier, distinguishing it from the single-piece RT-MT900 variant. For XC racers, weight-conscious trail riders, and anyone running a center-lock wheel system who wants the highest-spec Shimano rotor available in 140mm, this is the XTR flagship specification.
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Shimano XTR RT-MT900-SE - 140mm | Center Lock
Shimano XTR RT-MT900-SE - 140mm | Center Lock
What Is the Shimano XTR RT-MT900-SE Rotor and Who Is It Built For?
The RT-MT900-SE is Shimano's flagship XTR disc brake rotor in the 140mm center-lock format, built around a two-piece construction that combines a stainless steel braking surface with an aluminum carrier spider. This Freeza rotor construction uses a finned aluminum carrier to dramatically increase the surface area available for heat dissipation compared to a single-piece steel rotor of the same diameter. During sustained braking on long descents, heat buildup in the rotor is the primary cause of brake fade, as elevated pad and fluid temperatures reduce braking force and modulation. By routing heat from the steel braking track into the aluminum spider fins and dissipating it into the airflow around the rotor, the Freeza design maintains more consistent brake lever feel and pad bite across extended descents. The 140mm size is optimized for XC racing and lightweight trail builds where total system weight is a priority and the terrain demands high modulation over raw stopping power. The center-lock interface uses a standard Shimano lockring (sold separately or included with compatible hubs) for installation.
The RT-MT900-SE 140mm center-lock is designed for use with Shimano XTR and XT hydraulic disc brake systems and is compatible with any center-lock disc hub. The SE designation indicates the two-piece Freeza construction with finned aluminum carrier, distinguishing it from the single-piece RT-MT900 variant. For XC racers, weight-conscious trail riders, and anyone running a center-lock wheel system who wants the highest-spec Shimano rotor available in 140mm, this is the XTR flagship specification.
Original: $85.99
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Description
What Is the Shimano XTR RT-MT900-SE Rotor and Who Is It Built For?
The RT-MT900-SE is Shimano's flagship XTR disc brake rotor in the 140mm center-lock format, built around a two-piece construction that combines a stainless steel braking surface with an aluminum carrier spider. This Freeza rotor construction uses a finned aluminum carrier to dramatically increase the surface area available for heat dissipation compared to a single-piece steel rotor of the same diameter. During sustained braking on long descents, heat buildup in the rotor is the primary cause of brake fade, as elevated pad and fluid temperatures reduce braking force and modulation. By routing heat from the steel braking track into the aluminum spider fins and dissipating it into the airflow around the rotor, the Freeza design maintains more consistent brake lever feel and pad bite across extended descents. The 140mm size is optimized for XC racing and lightweight trail builds where total system weight is a priority and the terrain demands high modulation over raw stopping power. The center-lock interface uses a standard Shimano lockring (sold separately or included with compatible hubs) for installation.
The RT-MT900-SE 140mm center-lock is designed for use with Shimano XTR and XT hydraulic disc brake systems and is compatible with any center-lock disc hub. The SE designation indicates the two-piece Freeza construction with finned aluminum carrier, distinguishing it from the single-piece RT-MT900 variant. For XC racers, weight-conscious trail riders, and anyone running a center-lock wheel system who wants the highest-spec Shimano rotor available in 140mm, this is the XTR flagship specification.
