Aerozine Titanium have a background in aerospace engineering which means they know a thing or to about making things light, a forty quid stem weighing just 104g (110mm) for instance.
The XS7's stem body and faceplates are forged from 7050 aluminium alloy with a bit of CNC machining at the steerer clamp to remove weight. It is designed for oversize 31.8mm bars and a 1 1/8in steerer as you'd expect these days and comes in 10mm length increments form a diddy 50mm to 130mm which I'm guessing will cover pretty much everybody on the planet except for a handful of pro sprinters.
Rather than go for a single faceplate the XS7 uses two strips to clamp your handlebar. It makes things a lot easier to set up and adjust and thanks to the slight flaring in profile at the centre section you're aren't loosing much in the way of clamping surface. There certainly aren't any issues with it holding the bar tightly.
The hardware is all titanium which sheds a little bit of weight and on the aesthetics side of things rusty bolts won't be an issue through the winter months.
Once clamped to the bike it feels stiff without being harsh and does everything a stem should. With the low weight I was expecting to feel a little bit of flex when climbing or sprinting but I certainly couldn't detect anything untoward.
The XS7 has a +/- 6° angle which is a little on the shallow side if you prefer a deep saddle-to-bar drop but it works well if all day comfort is your thing. The logos are reversible to so it won't look out of place whichever way up you run it.
Finish wise there are a couple of options if the standard black is a bit too sedate for you. Gloss white or red are the shouty options both of which come with black faceplates rather than the polished alloy.
Overall the XS7 is a cool looking bit of kit especially when paired with the matching XB1.2 handlebar. The early reservations I had about the light weight weren't borne out by any noticeable flex but there is just enough there to absorb the road buzz as its pretty comfortable for an alloy stem. It's cracking value for money as well.
Plenty of stiffness and good secure clamps, cheap for its weight and titanium bling too.
road.cc test report
Make and model: Aerozine XS7 SUPERLIGHT Alloy Stem With Titanium Bolts
Size tested: 110mm length - black
Tell us what the product is for, and who it's aimed at. What do the manufacturers say about it? How does that compare to your own feelings about it?
It's a geneeral-use stem designed for road, cross-country and all-mountain use. We think that means anything but downhill racing and its variants. It's light for an alloy stem of its price.
Tell us some more about the technical aspects of the product?
Material AL-7050 3D Forged Stem
steerer height 42mm
Angle 84 / 6°
Bolt Titanium bolts (4 x M5*16 & 2 x M5*18)
Length 50, 60, 80, 90, 100, 110, 120, 130mm
Colors Black , Painting White , Painting Red
Tell us how the product performed overall when used for its designed purpose
Its a very good entry level stem that is both stiff and shock absorbing
Tell us what you particularly liked about the product
The stiffness and weight.
Tell us what you particularly disliked about the product
The shallow angle being the only option.
Did you enjoy using the product? Yes.
Would you consider buying the product? Yes.
Would you recommend the product to a friend? Yes.
About the tester
Age: 35 Height: 180cm Weight: 76kg
I usually ride: Whatever needs testing or Genesis Flyer, fixed of course! My best bike is: Kinesis T2 with full Centaur Red
I've been riding for: 10-20 years I ride: Every day I would class myself as: Expert
I regularly do the following types of riding: time trialling, commuting, club rides, sportives, fixed/singlespeed,
Stu knocked out his first road.cc review back in 2009 and since then he's chucked the best part of seventy test bikes around the West Country, a couple of them quite literally! With three alloy and two steel bikes in his fleet he's definitely a metal man (that'll be the engineering background) but is slowly warming to that modern carbon fibre stuff along with fat tyres & disc brakes.
It's not all nostalgia though, after spending the last few years in product design Stu keeps banging on about how 3D printing is going to be the next big thing and he's a sucker for a beautiful paint job too.