Shimano SLX SM-RT66 Brake Disc, 203 mm, 6-Bolt

Shimano SLX SM-RT66 – High-Performance 203 mm Brake Disc for 6-Bolt Mounts

The Shimano SLX SM-RT66 is a 203 mm brake disc designed for 6-bolt mounting systems. It delivers consistent, powerful braking performance across demanding riding conditions.

• 203 mm diameter provides ample stopping surface for reliable deceleration on steep descents
• 6-bolt mount ensures secure attachment to the hub and minimizes rotational flex under heavy braking
• Shimano SLX series engineering delivers durable construction built for repeated use
• Lightweight design at 0.314 kg keeps rotational mass low for responsive handling

What Makes the SLX SM-RT66 Stand Out

The 6-bolt mounting pattern is a widely adopted standard across modern hubs, offering a stronger and more precise connection than older 5-bolt designs. The 203 mm size balances braking power with manageable weight, making it suitable for both trail and enduro riding where sustained braking generates significant heat.

Ideal For...

Mountain bikers and gravel riders who need a dependable, high-performance brake disc for demanding terrain. The 203 mm diameter suits riders who face long, steep descents and require consistent braking feel over extended periods without fade.

Application of the Shimano SLX SM-RT66

Mount the disc onto a 6-bolt compatible hub using the provided bolt pattern. Ensure the rotor is properly aligned with the brake caliper before riding. Regularly inspect the mounting bolts for tightness and the disc surface for wear or contamination.