SHIMANO GRX 1x12 UNBEATABLE 

If your next outing includes pushing for personal PRs or duking it out at the sharp end of a race, you’ll appreciate the gear steps of the RX820 1x12 setup with a 10-45 cassette paired with a 40- or 42-tooth chainring. Just like its 11-speed predecessor, RX820 delivers smooth, reliable shifting but now features a wider gear range and extra cog, making it easier to find the optimal cadence for maintaining your position in the pack.

This setup employs a medium cage rear derailleur with integrated SHADOW RD+ chain stabilizer, providing quieter shifting, and more secure chain management in rough terrain. No need to worry about your next shift; instead, stay focused on dropping the competition. 

SHIMANO GRX 1x12 UNSTOPPABLE

If all-day—or multi-day—adventures heavy on climbing are your thing, the new RX820 1x12 UNSTOPPABLE option with SHIMANO’s wide-range, 10-51T cassette offering is ideal. Paired with a 40T or 42T chainring, you'll never run out of gears, even on the steepest jeep road or high mountain ascent. And like the 10-45T, 1x12 option, this group features an integrated SHADOW RD+ chain stabilizer for optimal chain security and an ON/OFF switch, making wheel removal quick and easy if you happen to puncture.  

Both 1x12 options utilize Micro Spline, SHIMANO’s lightweight aluminum freehub design that seamlessly integrates with 10-tooth top gears and features smaller, more widely spaced splines that limit cog damage. The 1x12 gravel-specific crankset is offered in three crankarm lengths, giving you the option to choose the ideal SHIMANO GRX setup for your needs and riding style. 

Parts Included

• Shimano ULTEGRA 12-SPEED Di2 FC-R8100 FRONT CRANKS
• Shimano CS-M8100 MICROSPLINE CASSETTE 10-45 12-SPEED XT
• Shimano CN-M8100 CHAIN 12-SPEED XT w/QUICK LINK 116 LINKS
• Shimano ST-RX820 SHIFT-BRAKE LEVER R.H wBR-RX820 FRONT DISC
• Shimano ST-RX820-LA BRAKE LEVER GRX L.H ADJUSTABLE SEAT POST
• Shimano BR-RX820 REAR DISC BRAKE GRX w/L05A RESIN PAD
• Shimano RD-RX822 REAR DERAILLEUR GRX SHADOW+ 12-SPEED MEDIUM LENGTH

Optional Parts

• Shimano SM-MA-R160-DD ADAPTER 160mm REAR CALIPER
• Shimano RT-MT800 DISC ROTOR 160mm XT ICE-TECH CENTERLOCK
• Shimano SM-RT70 DISC ROTOR 160mm 105/SLX CENTERLOCK
• Shimano Bottom Bracket Road 24mm Spindle

Carbon Wheelset

• Shimano WH-RX880 FRONT WHEEL TUBELESS 12mm CENTERLOCK 700C
• Shimano WH-RX880 REAR WHEEL TUBELESS 12mm CENTERLOCK 700C