HASSNS Folding Stem Double Handlebar Compatibility Features
This innovative stem accepts both 25.4mm and 31.8mm diameter handlebars through a dual-clamp design, making it compatible with vintage BMX models and modern mountain bikes in a single component. The lightweight aluminum rod construction weighs under 120 grams, critical for riders who frequently transport bikes between locations. The double folding mechanism rotates the handlebar attachment point downward, reducing overall frame height by up to 200mm when fully collapsed. Engineers positioned the adjustment points for intuitive one-handed operation so you can modify your setup without tools during trail breaks. The compact storage design preserves full lateral rigidity in riding position, ensuring no performance compromise despite the adjustable architecture.
AliExpress Shopper –
Magnificent, super quality 😍
E***c –
Hello, good quality, well received.
P***i –
Some stores seem to have images of an L-shaped 90-degree option, but it’s only available in three straight steps, so there’s no mistake.
I installed the handlebar on the front of an electric folding bike where it’s unusually far away, contrary to what it should be. As a result, this product is sturdy in construction, so it is possible.
Also, it can be installed on handlebars with auxiliary bars like mine because it is a split type.
However, if the handlebar post is fixed with a quick-release handlebar, if you leave this product floating without attaching it anywhere, it might rotate.
In that case, after locking with a quick release, you can additionally tighten the hand screw on the back of the quick release with pliers or clamp a thin aluminum plate (two pieces of 40mm×25mm) between the pipe from above and below by clamping it from both sides. (For reference only)
w***t –
That’s really great!
AliExpress Shopper –
I purchased this to convert my folding bike to drop handlebars. Since the handlebars were too far apart, I installed this part facing forward to bring the handlebars closer. It’s comfortable. Buying such machined aluminum parts in Japan would cost around 10,000 yen, so the cost-performance ratio is excellent. Delivery was within a week.