Planning on some drivetrain upgrades for the new year? Praxis just dropped a few new options that cover the spectrum from high end MTB to heavy duty e-bike use.

Praxis Girder Carbon G2 crankset

First shown in 2017, the Praxis Girder carbon crankset was their take on an “affordable” carbon crankset. Now, the Girder Carbon G2 crankset builds on that premise with more shapely arms that are designed to offer better frame clearance – not to mention they’ve actually gotten less expensive.

Still using their M30 spindle which requires the use of the Praxis M30 bottom brackets. the spindle uses a 30mm drive side bearing and a 28mm non-drive.

PRaxis Girder G2 carbon chainring configuration

Also updated is the 3 bolt direct mount chainring interface which has been adjusted to work with established chainline offsets. The crankset now weighs in at 488g without a ring, and they’re available in 165, 170, and 175mm lengths with a 178mm q-factor. Sold without a chainring or bottom bracket, the crankarms are priced at $290.

Cadet HD

Praxis Cadet HD cranksFor those that are particularly hard on components, the Praxis Cadet crankset is now also offered in an HD version. HD of course standing for Heavy Duty with a reinforced arm structure. Otherwise, they’re the same forged aluminum crankset with the Praxis 30mm spindle, self extracting hardware, and direct mount chainring. This one is offered only in 165 and 170mm lengths with a 177mm q-factor and a claimed weight of 640g without a chainring. These are priced at $160 for the pair.


Praxis eHD e-bike crankset

It’s a similar story for the eHD crankset, just with a fitment designed for e-bikes. The ISIS Spline is meant for used with many different e-bike motors, and the HD cranks are offered in extra short 160 and 165mm options with q-factor varying by the motor that they’re mounted to. The HD version of these sells for $85.

Ceramic M30 Bearing Kit

Praxis ceramic M30 bearing upgrade kit

Last up is a new Ceramic option for their M30 bearing bottom brackets. Given the proprietary 30/28mm bearing diameter, you’ll have limited options for replacements, so Praxis now offers ceramic replacement bearings for existing M30 bottom brackets. The rebuild kit only applies to the bottom brackets listed below, and the price is set at $85.

Compatible Bottom Brackets:

  • M30-BSA
  • M30-BB30/PF30
  • M30-386EVO
  • M30-BBright
  • M30-T47 E.B
  • M30-T47 I.B.


  1. Miclaroc on

    Am I wrong to believe shifting will always be better with cranksets designed to be used as a unit with the rest of the drivetrain? Ie. shimano or campy crank set with its own respective group? Why use alternate cranks like this? Manufacturers say so much about designing rings and ramps and teeth for shifting so carefully and precisely wouldn’t this detract from such precision?

    • Robin on

      Well here are three reasons, and there are of course more:
      1. Aesthetics
      2. Compatibility with power meters (mostly roadie thing)
      3. Mass
      4. Choice

      Praxis’ chainrings have been proven to shift arguably as well as OEM chainrings. LevaTime, I think, is what they call they’re chain ring shifting profile/design.

      It’s also good for consumers to have choice, and a robust aftermarket can put pressure on the OEM makers to up their game.

    • Greg on

      Versus Shimano or Campy systems, I would generally avoid aftermarket chainrings. With SRAM, Praxis will shift similarly most of the time.
      Personally, I don’t care for Praxis wave ring 1x chainrings. I just don’t see how they could manage and control a chain as well as narrow/wide teeth.

    • K-Pop is dangerous to your health on

      To be fair Praxis also does doubles for road so it’s a legit question. To expand more on Miclaroc’s observation; I’ve run Praxis with Shimano and Sram groups and White Industries with Campy and never ran into shifting problems up front. Manufacturers will always suggest that you run their cranks and chainrings over the aftermarket because they want your money. Shifting ramps and pins isn’t rocket science, and I would argue that the aftermarket does it just as good if not better than what ever company your group came from.

  2. berdterd on

    @Miclaroc, it’s actually a SRAM 3-bolt mount system. So for the particular among us, we can still run sram’s rings. I think you’re kinda S.O.L. on Shimano, though. I just haven’t installed a too many 12-sp replacement chainrings on the 12-speed Shimano stuff just yet.

    Here’s why you’d opt for something like a Girder, though. maybe you want more ground clearance, so you choose a 165mm girder (sram doesn’t offer a 165mm non-dh spaced crank in carbon, GX is the best you can get).

    Plus, that Girder is within 10g of an X01 crank, at ~$200 DISCOUNT (~$100 if you account for purchasing a SRAM Chainring at full retail). A lot of manufacturers like this are keepin it real for a lot of riders.

    Good point, though. Chain plate/roller and crank tooth profiling are IMMENSELY important in drivetrain performance and longevity!

  3. WorkOnSunday on

    why keep the asymmetric bearing system? sram gave up that when moving form gxp to DUB. i understand if drive side has a bigger bearing for the torque that it is likely to see…but the opposite….any reason for this?

    • Nick on

      The design of GXP was that the RH bearing looks after radial loads whilst the LH side looks after axial loads. At least that’s what I’m lead to believe. It’s likely that’s the same here with M30


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