Syntace LiteForce stem review

Can Syntace’s LiteForce stem really deliver enduro strength and stiffness at XC race weight?

Syntace LiteForce stem fitted to mountain bike handlebar
(Image: © Guy Kesteven)

Bike Perfect Verdict

Syntace’s Liteforce stem isn’t showy but rather a masterpiece of using the right materials in the right way to create a bombproof, precision-steering stem with minimal mass.


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    Exceptionally light

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    Seriously stiff

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    10-year guarantee

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    Extensive length range

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    No sharp edges

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    Titanium bolts as standard

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    Flip-flop logos


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    No 35mm bar option

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Syntace is legendary in the European premium componentry scene but rarely seen in English-speaking countries. The exceptional performance of this stem - and other kit we’ve tested from the German brand - shows that its kit is well worth hunting down if you can. We've been using the Syntace LiteForce to establish where it sits in terms of the best mountain bikes stems. Here's what we think. 

Syntace LiteForce stem

The 3D-forged, single-piece body of the LiteForce feels just as stiff as its burlier DH rivals (Image credit: Guy Kesteven)

Performance and specification

The Liteforce is a further evolution of Syntace’s superlight F109 and Force99 series stems blended with the new wider clamp design of the MegaForce range. The result is a 15 per cent weight reduction of what were already frighteningly light stems, and the 50mm version only weighs 83g. Having ridden Syntace stems a lot on other bikes, we weren’t surprised that the ultra-precise, 3D-forged, single-piece body of the LiteForce felt just as stiff and tight as most pieces this side of 200g DH anvils. We couldn’t even get it to flex or twist noticeably when hanging off the end of 780mm bars with super grippy rubber and it’s never slipped, creaked or done anything else to worry us in several hundred km of hard work. There’s no rider weight limit either, and Syntace is happy to extend its usual 10-year workmanship warranty to this featherweight piece, too. 

It’s not just brilliant from a performance point of view either. The 200-degree wrap of the clamp means just enough ‘pop-in’ grip to hold the bar in place at the right angle as you do up the two separate bolt clamping bars. On the back, the stems are fully hidden in a rounded profile so there are no sharp edges to slice knees in a crash. 

Giving the stem a six-degree rise means you can flip it either side up, giving a lower race position or a higher rise without the extra weight of a longer steerer tube and spacers underneath. You get logos both ways up too, so there’s no right or wrong way to orient it. 

The aftermarket stem also comes with top-quality titanium screws to stop corrosion and tool damage over time. There’s also an option to get the stem with Syntace’s TwinFix clamping system which combines Lupine light, GPS computer or phone holder accessory mounts.

The only downside for fat bar fans is that 31.8mm bar clamps are the only option, and you’ll need to go for the slightly heavier MegaForce stem if you want 30- or 40mm lengths.


Syntace has done an amazing job of refining its stem design to a new ultralight-yet-totally-trustworthy benchmark standard that’s well in advance of anything else we’ve tried. It comes in all the lengths weight watchers are likely to want, and the 31.8mm bar-only sizing won’t bother most XC/Trail riders either. 

At $146 / £105 / €124 it’s not even a crazy price, considering its outstanding performance and meticulous manufacture. It's one of the best mountain bike stems on the market and gets our recommendation backed by a five-star rating.

Tech Specs: Syntace LiteForce stem

  • Price: $146 / £105 / €124 
  • Weight: 93g (75mm with Ti bolts)
  • Colors: Black
  • Sizes: 50, 60, 75, 90, 100, 110, 120 and 135mm lengths. 31.8 bar only.
Guy Kesteven

Guy Kesteven has been working on Bike Perfect since its launch in 2019. He started writing and testing for bike mags in 1996. Since then he’s written several million words about several thousand test bikes and a ridiculous amount of riding gear. He’s also penned a handful of bike-related books and he reviews MTBs over on YouTube.

Current rides: Cervelo ZFS-5, Specialized Chisel, custom Nicolai enduro tandem, Landescape/Swallow custom gravel tandem

Height: 180cm

Weight: 69kg