Rotor 3D+ Mtb Cranks and Q-Rings Review

Components Pro Reviews

Rotor is a company from Spain that manufacturers very high end components. They’ve been making waves with with their 3D+ crank system and Q-Rings and they sent us a set of of their 2×10 crank to try out.

I’ve been using the 2×10 crank for about a month and it has been a revelation.  First off, the cranks are incredibly stiff. They are able to fit a 30mm crank spindle on to my old Santa Cruz with standard bb shell.  This spindle with these crank arms is stiff and it is noticeable. The system is light too at 690 grams complete with BB so it’s a few grams lighter than the Shimano XTR 2×10 crank and BB.

The big revelation though is that these cranks actually make a difference.  I have ridden SLX, XX XTR and many carbon cranks and it’s pretty darn hard to tell the difference.  The difference is mostly in shifting and durability . None of the cranks make me faster, slower, or smoother.  The Rotor Q-Rings seem to do that. It makes my pedal stroke smoother and it seems to give more power, longer. The 2×10 chainrings I got were 40-27 teeth. That seems like an odd combination but it is very similar to a 39×26 double chainring.   When I’m on the 40 ring,  I get the equivalent of a 42 tooth ring at my sweet spot, which is right under the 3 o’clock position.  At my weakest point, thich right at top at 12 o clock, I get about a 39 tooth ring.  This ring is ovalized and is constantly changing size on my as I go through my uneven stroke.

So instead of pedaling in squares where you struggle to get the pedals over the top, Rotor aims to smooth out your stroke and even out your power. This is most evident when you’re pooped or going for a Strava KOM and can’t turn your pedals over. It will help you stay at a heavier gear and help you deliver more consistent power. It can also help with back pain and knee pain where the rider is experiencing stress as we compensate for the dead/weak spots in our stroke

The cool thing for me is on my first ride, it felt good. It just felt smooth and it I could tell its effects when I was knackered and when I usually lose my spin. I thought it would take me weeks to adjust to it but it was pretty natural actually.  The reason for this is our body really has an uneven pedaling stroke. At the 12 o’clock position, we really have much less power than at the 3 o’clock position.  We’ve been trained over the years to smooth out this stroke but folks have varying degrees of pedal smoothness specially at full effort.

We’ve only used it for a month so we are still collecting data and haven’t tried to break our Strava PRs yet. But stay tuned.

Meanwhile, we saw this site called and it has a ton of user reviews on the Q-Rings. 🙂  We checked them out and it is a treasure chest of real-world experiences by people who have paid for the product and used them long-term.  The feedback is great and it confirms a lot of our observations. We’ve collected the strengths and weaknesses of reviewers below.

3D Cranks:

Q- Rings:

4.76/5 (33 Reviews)


  • Works as intended
  • Reduces knee pain/discomfort
  • Free speed on the rides!
  • Awesome difference
  • Riding bigger gears
  • Less fatigued after a ride,
  • Back pain after an epic ride is GONE …. just try them .
  • Options available are designed specifically to replace major brands with minimum fuss
  • Better acceleration
  • Don’t have to get used to it
  • Good quality
  • Light
  • Possibility to finetune the chainring position
  • Can buy just the Q-Rings to start off


  • Pricey, Pricey
  • Does not shift as well
  • Does not fit all carbon cranks
  • You’ll probably have to upgrade all your other bikes as well.
  • Confusing terminology in manual – “regulation points”
  • Folks will think you have ‘biopace’ and you won’t hear the end of it.

Bottom Line:

At any price, it is worth trying out. Consider the Q-rings first to see the benefit and if it makes sense for you. Of course the risk always is you’ll like it so much that  you’ll feel compelled to upgrade all your bikes in the stable.


3D+ Cranks – $660

Double Q-Rings Set – $245


About the author: Francis Cebedo

The founder of mtbr and roadbikereview, Francis Cebedo believes that every cyclist has a lot to teach and a lot to learn. "Our websites are communal hubs for sharing cycling experiences, trading adventure stories, and passing along product information and opinions." Francis' favorite bike is the last bike he rode, whether it's a dirt jumper, singlespeed, trail bike, lugged commuter or ultralight carbon road steed. Indeed, Francis loves cycling in all its forms and is happiest when infecting others with that same passion. Francis also believes that IPA will save America.

Related Articles


  • Chris says:

    So their bb will allow you to run a 30mm spindle thru a standard bb shell? Also, it appears that the spider can be removed from the crank arm. Is this correct? If yes, one could then run a spiderless chain wheel say from HBC and have a wicked light set of SS cranks!!! Hmmm, if that is the case then I am thinking that I need to save up some money!!!

  • euqi santos says:

    just would like to ask if you sell roto rings only without the arms compatible for shimano 3X10 cranks?

  • RanDog says:

    Same Question, in my case just the 2 inner q-rings for FC-M980 XTR TRIPLE, Do You Make Them?
    I have an earlier M970 with Q-rotors, only the two inners on my old 9spd would work on my Spark, but thats all I really needed for my XC use.

Leave a Reply

Your email address will not be published. Required fields are marked *





© Copyright 2020 VerticalScope Inc. All rights reserved.