Shimano SM-RT66 6 Bolt Disc Brake Rotor Size:180mm Steerer - Is the outside

Steerer - Is the outside diameter of the fork steer tube on your bike

and gives you a tube of the same diameter at a 90-degree angle

Forged aluminum construction

ULTEGRA 6500 Series

Pair with the Crux™ reservoir on/off valve (sold separately) for 20% more water flow per sip

Shimano SM-RT66 6 Bolt Disc Brake Rotor Size:180mm Steerer - Is the outsideAt the end of last season, you promised yourself you'd finally buy some fresh rotors in the spring, so don't put it off. If you're running 6 bolt disc bakes, grab the Shimano SLX RT66 6 Bolt Rotor and make sure you'll be able to stop consistently on the muddy, rough trail conditions you're bound to encounter in the early part of next season. A steel construction promises durability without a hefty price tag, and strategically carved mud shedding slots