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Item # SRM0539

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  • Black, 175mm, GXP ($190.00)
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Item # SRM0539

Go with simplicity.

When we first introduced SRAM's new XX1 group set to the site, we were blown away by the demand for its blend of rugged sensibility and diverse functionality. We understand the support, especially considering that the aforementioned is paired with an 11-speed setup. However, after compiling feedback, we did notice that XX1 would benefit from a more customizable configuration. For that reason, we're providing the XX1 GXP Crank Arms - Q-Factor 156 without chainrings. So we're leaving your choice in gearing to be just that―your choice.

XX1's functionality, Q-factor, and compatibility make it the standout component in the new SRAM arsenal. To achieve this, carbon arms have been mated to a redesigned aluminum spider. As a result, the crank arm is lightweight, but doesn't require any finessing of parts in order to make an optimal single-ring setup. In fact, the required X-SYNC chainring has been designed for maximum chain control, with each tooth being CNC-machined to support the chain's inner- and outer-links.

This machining process results in a variable thickness from tooth to tooth, so the chain and chainring essentially lock together as you pedal. However, the locking of the two doesn't inhibit pedal efficiency. And, even better, it eliminates the common ailments associated with running a single ring up front. Essentially, this creates a liberation from chain guides in order to keep the chain in place on rugged, chain-slapping trails.

SRAM even went as far as to say that you have a better chance of dropping your chain with a front derailleur than you do with the XX1 crank and chain combo. The new chainring's 76mm bolt circle diameter sets it apart from others in the SRAM catalog. This diameter evolved from a functionality standpoint, not as an afterthought of the new, universal spider shape.

Its design makes it simple to remove the chainring for maintenance or ratio changes. Gone are the days of finagling the chainring off the spider. Now, all you need to do is unscrew the bolts and move the chainring off, and you'll have the replacement on in minutes. Even better, SRAM has created six different chainring sizes that are compatible with the new XX1 spider; it's for this very reason that we're providing these crank arms without a forced chainring configuration. This means that you're able to dial in your range in order to match the trail, either beforehand or on-the-fly.

And although the XX1 crank arm is designed to work in tandem with the XX1 group set, you are able to use the crank with a 10-speed chain should you want to enjoy the benefits of running a single-speed or one-by-10 setup.

The SRAM XX1 GXP Crank Arms - Q-Factor 156 has a 156mm Q-factor and is available in either a 170 or 175mm crank arm length. Please note that these crank arms are only compatible with SRAM GXP bottom brackets, and that they do not include chainrings.

  • Carbon fiber crank arms
  • Aluminum spider
  • 76mm bolt circle diameter (BCD)
  • 165 Q-Factor
  • With the removal of spider, cranks are compatible with SRAM Direct-Mount chainrings

Tech Specs

Arm Material:
carbon fiber
Arm Length:
170 mm, 175 mm
Chainring Sizes:
[not included]
Bolt Circle Diameter:
76 mm
Bottom Bracket:
BB Type:
BB Threading:
Compatible Components:
SRAM XX1 chainrings, SRAM direct-mount chainrings
Recommended Use:
mountain biking
Manufacturer Warranty:
2 years
Actual Weight:
Black, 175mm, GXP: 507g

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Here's what others have to say...



  • Familiarity:I've used it several times

My XT gave out so i gave this a try.....GREAT price and very nice right out of the box. I have a 2012 Trek 9.9EX Top Fuel and with the 1x11 setup and direct 32 tooth....wee....I could not be happier.