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Rotor
QX2 Outer Chainring

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Eliminate dead spots.

Rotor took its road-winning technology and finally released ovalized mountain bike rings, as well as single-, double-, and triple-specific REX mountain bike cranksets this past fall. The QX2 is designed as the outer chainring for a 2-ring mountain bike drivetrain.


Ovalized chainrings are essentially designed to maximize the efficiency of your pedal stroke by prolonging the power zone and minimizing dead spots. They are machined with a subtle oval shape and, with multiple mounting holes, can be "clocked" to maximize the effects for your biomechanics, pedaling style, and bike geometry. The QX2 features an ovality of 10%, which helps you accelerate better, experience smoother torque, and grip better off road. Additionally, the alternating thick and thin tooth profile keeps your chain from dropping — even in the roughest conditions. This eliminates the need for a chain guide.


The Rotor QX2 Outer Chainring comes in sizes: 104-38t, 104-40t, 110-36t, 110-38t, 110-39t, 110-40t, 120-38t, and 120-40t. Each ring comes in the color Black.


Material
aluminum
Number of Rings
1
Teeth
[104 bolt diameter] 38 t, [104 bolt diameter] 40 t, [110 bolt diameter] 36 t, [110 bolt diameter] 38 t, [110 bolt diameter] 39 t, [110 bolt diameter] 40 t, [120 bolt diameter] 38 t, [120 bolt diameter] 40 t
Bolt Circle Diameter
104 mm, 110 mm, 120 mm
Bashguard Included
no
Compatible Components
SRAM, Rotor REX 1.1, 2.1
Recommended Use
mountain biking
Manufacturer Warranty
1 year

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