Praxis Works Girder M30 MTN Cranks Now Available Along with New 30t MTB Wide Narrow Ring

Praxis Works Girder M30 mtb crank 30 t narrow wide chainring (2)

In development for a few years now, Praxis Works’ line of Turn cranksets are starting to find their way onto road bikes in the wild. Now, you can add mountain bikes to the mix. Created as both an OEM and aftermarket solution, Turn cranks are built with stiffness in mind with hollow forged arms and a 30mm aluminum spindle. In fact, in a recent stiffness test carried out by Fairwheel Bikes, the Turn Zayante 2015 road crank had the least deflection of any crank tested. It was also the heaviest modern crank they tested, but the Praxis Works bottom brackets trade off a bit of weight for durability.

The Girder M30 MTN crank looks to bring the same level of stiffness to mountain bikes. Currently in stock and shipping in select sizes, the M30 crank relies on the same 30mm spindle and bottom bracket technology as the road crankset just with mountain gearing. Girders will ship with either a 2x ring combination or one of Praxis Works’ own Wide-Narrow chainrings including the new 30t…

Praxis Works Girder M30 mtb crank 30 t narrow wide chainring (2)

When not using a single chainring in the 104 BCD outer arm position on the spider, the cranks can be run 2x with the 104/64 BCD spider. Available in 165, 170, 175, and 180mm crank arm lengths, compatible bottom brackets will be offered for threaded 68/73mm shells as well as PF92, and BB30/PF30 frames.

Praxis Works Girder M30 mtb crank 30 t narrow wide chainring (1)

As mentioned, the Turn Girder M30 crankset relies on a 30mm aluminum spindle for stiffness, that tapers down to 28mm at the crank. The hollow forged arms aluminum and a forged AL spider should provide plenty of stiffness based on the numbers from their road cranks. Sold as a 1x drivetrain with either a 30 or 32t Praxis Wide Narrow chainring, the cranksets are currently available in only the 175mm length for $279 with more options on the way. That price includes the chain ring and an M30 installation and removal tool, but bottom brackets are sold separately for $50-85.

Praxis Works Girder M30 mtb crank 30 t narrow wide chainring (1)

Earlier this year, Praxis Works introduced their new Wide-Narrow chainrings with a run of 32-38t rings. Unlike the rest of their chainrings which are forged, the Wide Narrow rings are stamped from a 4.5mm thick plate of 7075-T6 aluminum and then machined. The new 30t chainring undergoes the same construction process but adds the additional machining of the threads so the smaller ring can still fit on a 104 BCD crank.

Like other 30T/104 BCD single rings, the Praxis ring requires male M8 chainring bolts with a minimum length of 7.5mm to ensure proper engagement. Hard anodized and compatible with 10/11sp Shimano/KMC/SRAM, and 11sp SRAM XX1 chains, the rings are recommended only for use with a clutched derailleur. Likely due to the extra machining involved, the 30t rings are $25 more than the rest of the chainrings and sell for $75.

praxiscycles.com

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Antipodean_G
7 years ago

Been running these for a while. They are as good as they sound…..

chasejj
chasejj
7 years ago

If they are advertising stiffness. They should have a test between these and XTR and RF Next and RF Atlas. Throwdown. I have to say my Next SL Carbons feel super stiff.

name, required
name, required
7 years ago

Kinda boring looking. Couldnt they jazz them up some…

mudrock
mudrock
7 years ago

n,r – it will get muddy some enough. And that logo will get rubbed off from your ankle.

Dave B
Dave B
7 years ago

This whole emphasis and fixation on stiffness had gotten silly. At some point, probably well past, stiff enough is stiff enough. Square taper bottom brackets were plenty stiff, Octalink/ISIS were stiffer yet and the 24 mm external bearing spindles and bottom brackets were more than stiff enough. All of this 30 mm stuff has gone beyond common sense.

shafty
shafty
7 years ago

I’d say the time is past for crank manufacturers to find a smaller BCD. These 30t rings are nonsense. Maybe 64bcd doubles? I certainly wouldn’t go to such lengths to keep running a single ring, but some want to. Doesn’t needing 30t or smaller, assume you’re predominately in the largest sprockets of your cassette? That crank looks terrible with that tiny ring….

Antipodean_G
7 years ago

@name, required jazz it up to what end? Form follows function and I’d say that’s part of the attraction with this design. In person, on a bike, they look the part and actually a little bad a@!

customer
customer
7 years ago

Fine cranks, but I think nothing beats raceface cinch because of the modularity etc.

Haggis
Haggis
7 years ago

“I’d say the time is past for crank manufacturers to find a smaller BCD.”

As customer says, RF Cinch.

Jerome
Jerome
7 years ago

I agree with “name, required” on this one: there’s already too much boring flat black on the market. To each his own, I know, but hey, if you’re looking for black and silver parts, there’s already a boatload over there. Bring some jazz, please!