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Item # RTR000K

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  • Black, 34t ($125.00)
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Item # RTR000K

Climb faster.

Rotor is well known for its ovalized road chainrings and its cranksets. Now it has taken this technology and applied it to mountain biking with a series of chainrings designed to get you up and over faster. The QX1 is the first ovalized chainring designed for a 1x drivetrain.

Ovalized chainrings are not new. They actually appeared briefly years ago under the name Biopace but failed to attract a strong following. Not to be put off, Rotor took a new eye to the concept and redesigned the oval ring. What does an oval ring do? Well, they are essentially designed to maximize the efficiency of your pedal stroke by prolonging the power zone and minimizing dead spots. The rings 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 QX1 has an ovality of 12.5%, which helps you accelerate better, and experience smoother torque and better grip 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 QX1 Chainring comes in sizes 28-tooth to 36-tooth and in the color Black.

  • Aluminum
  • Slightly oval shape
  • Thick-thin tooth profile
  • Compatible with SRAM XX1 (adaptor required), Specialized, Rotor REX 1.1, 2.1

Tech Specs

Number of Rings:
28 t, 30 t, 32 t, 34 t, 36 t
Compatible Components:
SRAM XX1, [with adapter] Specialized, Rotor REX 1.1, 2.1
Claimed Weight:
[28t] 50 g
Recommended Use:
mountain biking
Manufacturer Warranty:
1 year

Community & Reviews

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Rotor QX1 Chainring

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Here's what others have to say...

Avg. ride time: 12h 19m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.
5 5


  • Familiarity: I've put it through the wringer

I'm loving the QX1 chainring paired with my SRAM XX1. Chain retention and durability has been flawless, yet I'm eeking out a few extra watts by virtue of its elliptical shape. I've just proactively replaced my chainring after 3k miles.

And no, you won't notice the elliptical shape after a couple rides!

do I need to buy the spider for a qx1 ring in order to mount it on a xx1 crank?
they are both 76mm bcd.

Responded on

Yes you will need the Rotor QX1 Spider to run on the Rotor REX 1.1 Cranks

Unanswered Question

Good day,

I noticed on the Rotor site that you are a dealer for them. I am looking for the new single Rotor ring that will fit on the bolt pattern of my 2014 Epic (Specialized S-Works Epic Carbon 29 World Cup 2014) with the stock Specialized crank it came with. Do you know if this ring is available?


When will the rotor spider for the sram OX GXP cranks be available?

Responded on

The QX1 GXP spider for SRAM cranks is now available. Only one site has them currently but that should change in the next few weeks/months.

4 5

Excellent performance, so so fit

  • Familiarity: I've put it through the wringer

Running a 32T QX1 on Giant Trance Advanced SX. Ring works really well for my pedal stroke. I tend to lose power coming to the top of the pedal stroke and this seems to smooth it out. It just feels better everywhere and I can hold onto the gear longer before I have to downshift. My only issue is that the spider you have to replace on the SRAM X01 (GXP) crank moved the chain line out another 6mm over stock! This made for a noisy 3 low gears and a nasty looking chain line in those gears. I ended up swapping the ring to the inside of the spider to bring the chain line back to stock. Works, but when you buy a premium product at a premium price, I expect it to fit perfect out of the box!

Responded on

Rotor are releasing a GXP specific spider, if you use the BB30 one then the chainline wont be ideal.

Avg. ride time: 5h 1m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

What is the BCD for these rings? 104? I...

What is the BCD for these rings? 104? I have a SRAM Stylo that I am currently running a 30t 104BCD narrow wide ring on, so would these fit?

Responded on

It says 76 BCD on the side of the chainring in the picture. That is the BCD used on XX1 cranksets.

Unanswered Question

Is this bash guard compatible? If, so is...

Is this bash guard compatible? If, so is it only with specific guards?