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Spanish company launches adjustable length stem on Kickstarter

A solution looking for a problem, or does this latest Kickstarter product have potential

Okay, first things first, the AIM (Adjustment in Motion) adjustable length stem from Spanish firm 3FStech is being promoted as a mountain bike product, but watching the video we couldn’t help feeling that it could be useful for cyclocross, gravel and adventure bikes.

A short stem so you’ve got a bit more control and less weight over the front wheel for riding tricky steep trails, and a longer stem for bashing along the road when you want to stretch out and get comfortable. With bikes increasingly being designed to excel on and off the road, could an adjustable length stem be a viable product or is it simply too early for April Fools' Jokes?

We can’t ever recall seeing an adjustable length stem, correct us if we’re wrong, through adjustable height stems are quite common on city and urban bikes. Those require tools to adjust, none has a remote lever for on-the-fly adjustments like the AIM.

aim stem.png

There has been a rash of flex and suspension stems this year, though. In fact, a look back at the archives shows we’ve reported on three suspension stems this year alone. Suspension is one thing, but adjustable length, does any cyclist really want that in a stem? 

- Suspension stems are back! 

The AIM is three-position adjustable stem, and can be adjusted while you’re in motion, using a handlebar mounted lever. It’s a 120mm stem with a -20-degree angle in its most stretched out position, shortening to 95mm and -7 degrees in the middle, and 55mm and +6 degrees at its shortest.

The company makes some bold claims for the advantages of the stem over conventional fixed stems.

aim adjustable stem 1.jpeg

“The 3FStech adjustable stem will be an evolution in mountain bike racing. It will provide better performance and more versatility because the bike can be adjusted as the rider’s environment changes,” states the company.

The stem isn’t the prettiest thing in the world, and nor is it light - it’s claimed weight is 350g, plus an extra 50g for the remote lever. A lightweight 120mm stem is more like 160g, so it’s a considerable weight penalty. We'd also be concerned about the stiffness and durability as well -the last thing you want is your handlebars sliding forward unexpectedly on a steep descent.

The company hopes to raise €25,000 of funding through the Kickstarter campaign that launched this week. If the Kickstarter campaign is successful, it aims to go into production in December with a first manufacturing run of 2,000 units. It’s not cheap, though, it’ll cost you €175 to get your hands on an early bird stem, but they do throw in a free t-shirt. It’s only compatible with 1 1/8in steerer tubes and 31.8mm handlebars.

Check it out now at


David worked on the tech team from 2012-2020. Previously he was editor of and before that staff writer at RCUK. He's a seasoned cyclist of all disciplines, from road to mountain biking, touring to cyclo-cross, he only wishes he had time to ride them all. He's mildly competitive, though he'll never admit it, and is a frequent road racer but is too lazy to do really well. He currently resides in the Cotswolds, and you can now find him over on his own YouTube channel David Arthur - Just Ride Bikes

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KiwiMike | 8 years ago

If you think this idea is good, wait till you see my next Kickstarter.





Airzound | 8 years ago

For £175 it should be adjustable for angle as well.

Dr. Ko | 8 years ago

175 quid is rather steep. Yes, I do see some potential for bike fitting like the other readers. Otherwise a duo of two steems (115/120 and 130/135) should do for me, if I lend a bike to a friend a third one around 100 may be added. (My bikes are 570-580 mm top tube, so anything shorter than a hundred seems rather useless to me.) My theorie: Change the stem in app. 10 mm steps and do so fine adjustments with the saddle position.

jollygoodvelo | 8 years ago

Can see it being useful for bike fitting, static bikes e.g. Wattbike and spinning etc, but surely this is unnecessary on a 'real' bike?

pj | 8 years ago

adjustable (length) stems used to be de rigeur in the olden days. I'm sure cinelli made a few. 

cat1commuter | 8 years ago

I think an adjustable length road bike stem would be useful for experimenting with bike fit. Would not need to be adjustable on the fly.

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