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Item # RTR000L

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  • Select options
  • Black, 110-40t ($150.00)
  • Black, 110-39t ($150.00)
  • Black, 110-38t ($150.00)
  • Black, 110-36t ($150.00)
  • Black, 104-40t ($150.00)
  • Black, 104-38t ($150.00)
  • Black, 120-40t ($150.00)
  • Black, 120-38t ($150.00)
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Item # RTR000L

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.

Tech Specs

[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
Number of Rings:
Recommended Use:
mountain biking
Manufacturer Warranty:
1 year
Bolt Circle Diameter:
104 mm, 110 mm, 120 mm
Compatible Components:
SRAM, Rotor REX 1.1, 2.1
Bashguard Included:

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Rotor QX2 Outer Chainring

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Here's what others have to say...

4 5


Just ordered an outer ring. I friend who's opinion I really respect believes in these, I'm really curios to see how these chainrings work out. I think Rotor is on to something, theoretically it's changing the timing on the camshaft of an engine, the difference being, we're the motor.......... and my motor needs all the help it can get.

Responded on

How is your ring working? I ordered mine on 3/11 and I am still waiting to receive it to test out.

Responded on

I had a chance to ride them for the first time a couple days ago. It's too soon to form an opinion on the power benefits and all, however, the rings do up or downshift under load as cleanly as any double ring set up I've used to date.