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  • Race Face Next SL G4 Crank Arms
  • OptionsRace Face -
Race FaceNext SL G4 Crank Arms
Sale 15% Off$407.99 $479.99

Item # RCF003E

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  • Carbon/Silver, 175mm ($407.99)
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Item # RCF003E

The best gets better.

It would've been easy for the engineers at Race Face to sit back and relax for a while after the release of the Next SL, surveying their line of lithe carbon componentry with pride and satisfied nods of approval. We're glad to say that they chose not to do this, and because of it, the gram-conscious world of XC and trail riding can continue to benefit from the brand's persistent quest for improvement. This year, that overachieving spirit has left us with the updated Race Face Next SL G4 Crank Arms, which manage to achieve the elusive industry-wide goal of being both lighter and stiffer than their predecessors through smart construction and an effective choice in materials.

Race Face didn't leave itself much room for improvement when it introduced its top-of-the-line Next SL last year, so for the most part, the brand let the effective design of the Next SL stand relatively unchanged. It continues to trust the same hollow carbon arm construction, reshaping the slim arms only slightly to integrate with the redesigned Next Direct Mount chainrings. This process ended up shaving six claimed grams per arm from last year's weight.

Anticipating the demands of one-by setups, Race Face also improved the system's lateral stiffness so it can better withstand the chain tension at acute angles that it's likely to experience regularly. It did this by using Super Alloy, a metal that boasts up to a 20% increase in strength compared to the venerable 7050 aluminum, in the spline interface. To offset the weight that this could've added to the setup, it then drilled out the end of the 30mm spindle, removing unnecessary material and saving four more claimed grams in the process.

As with the Next SL, the G4 continues to use Race Face's innovative Cinch system, allowing you to switch between one-by direct-mount chainrings or use a removable spider to run a double or triple setup if you swap bikes or change your mind.

Tech SpecsWeight
Tech Specs
Arm Material
[crank arms] carbon fiber
Arm Length
170 mm, 175 mm
30mm Super Alloy
Recommended Use
cross-country, trail
Manufacturer Warranty
3 years

Claimed Weight

Claimed weights are provided by the vendor.

Have questions? Chat with a Gearhead

[32t Direct Mount, without BB] 430 g

Reviews & Community


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Light & Fast!

  • Familiarity: I've used it several times

The Next SL cranks come out of the box and you are instantly amazed at how light they are. Connect your RaceFace Cinch chainring using a cassette tool, add the crank booties (I definitely recommend installing them to save your new shiny cranks), and you are good to go (and just lightened your bike by a fair amount).
The SL cranks pedal great and can take any punishment that Moab or your local enduro race can dish out.

excellent product

  • Familiarity: I've used it once or twice and have initial impressions

installed it on 2017 SC Bronson with BSA 30 cinch bottom bracket and rode at the trails, light and nice

Spindle size not the correct length.

    Riding a 2017 Trek fuel 9.8 ex 27.5 plus. This bike has
    the 148 boost spacing. Ordered the next sl g4 cranks. went to install them and the chain ring rubs on the lower chain stay. The spindle is wrong. The race face part number for the correct spindle kit is F30037. At this time backcountry does not carry this part. Race face. is back ordered and the spindle kit won't be available until the end of August. Before I ordered this product I did try to confirm with back country if this would fit .

    Avg. ride time: 3h 15m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    Not Much More To Say

    • Familiarity: I've put it through the wringer

    There's a classic saying when it comes to bikes: light, strong, cheap; pick two. Pretty sure you can figure out which ones it falls under. I'm running the 175mm length on my large SB5.5 with a 34t direct mount chainring.

    These are incredibly light. Sort of makes me worry about durability, but I haven't had any sort of issue with them and have already had a few hefty pedal strikes with them.

    Set up was a Cinch! Get it? All jokes aside (ok I'll explain - Raceface cranksets generally use their Cinch Bottom Bracket), this was seriously easy to set up once you have the bottom bracket installed.

    Sorta wish I picked up the Turquoise to match my Yeti, but c'est la vie it still looks rad!

    They are spendy, but are a great upgrade if you're looking to shave some weight. Give me a shout at my direct line 801.204.4547 or if you have any questions on these cranks or if you need help getting the right bottom bracket for your bike!

    Not Much More To Say

    Hello I have a BMC Team elite 01 MTB with XT crankset , is this the correct crank size for it? Should I need something else?

    Feather light

    • Familiarity: I've put it through the wringer

    These cranks are amazing. They're extremely light and stiff. Great way to knock some weight off your bike. You wont be disappointed. The carbon is very durable like any other carbon crank on the market.

    Best crank on the market

    • Familiarity: I've put it through the wringer

    This is the best crank on the market, bar none. RaceFace took the original NextSL and turned it up to 11, shedding about 15 grams while increasing stiffness.

    Even though it is the lightest production crank on the market (barring boutique options like Clavicula) it is still extremely durable, and can be seen on bikes ridden in the EWS. Cinch spindle interface system is the best in the industry as well, with the ability to run single, double, or even (gasp) triple chainring setups with no creaking or durability concerns. Would absolutely recommend this crank to anyone.

    First Class

    • Familiarity: I've put it through the wringer

    The G4 cranks raise the game. While only shedding 15g over the previous SLs, the G4 crank arms are stiffer and have a much improved aesthetic in my opinion. While increased stiffness is tough to evaluate on the bike, these are noticeably stiffer under offset load than the new Eagle X01 cranks. The cranks include a set of black crank boots to keep things tidy. At release, RaceFace also had a carbon spidered chainring, however those have been tabled for the time being.

    Lighter than light

    • Familiarity: I've used it several times

    These cranks are incredibly light without sacrificing strength and durability.

    Absolute Class Leader

    • Familiarity: I've used it several times

    This is the lightest production crankset.

    Just that sentence alone speaks volumes about the capability of this product. Not only is it the lightest, it feels absolutely rock solid, and comes with an extremely simple configuration (the CINCH system) for changing chainrings.

    If you're looking for the absolute best set of crankarms, this is it. Rotating weight is the most important thing to reduce and a set of Next SL cranks can drop a serious amount of weight on a seriously pivotal part of the bike.

    Get in contact with me if you have any questions about the crank. I ride this on my own bike and know it well.

    Light and strong

    • Familiarity: I've put it through the wringer

    These cranks are the best! Light AND strong!

    Avg. ride time: 0m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    If bees had knees...

    • Familiarity: I've put it through the wringer

    they would be constructed of hollow carbon arms.

    The combination of low weight, great looks, and high versatility is unbeatable. I've ridden these for 2 years on my 160mm travel 29er but would put them on a 20lb hardtail in a heartbeat. Simply put, there's nothing I would rather use.

    If bees had knees...
    Avg. ride time: 5h 31m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    Stiff, Durable & Light

    • Familiarity: I've put it through the wringer

    Not much more to look for in a high performance crank! These hit on all cylinders - well done.