31.8mm Handlebar 35mm MTB Stem - Super Light Alloy Short Stem

In this review the FIFTY-FIFTY 35mm short stem is judged as a targeted upgrade for riders who want a lighter, stiffer cockpit without changing handlebar or steerer size. The bottom line: it is a well-machined 6061T6 aluminum stem that trims weight to just 132g while keeping a secure four-bolt clamp and a Close Gap face plate that makes installation straightforward. For trail, all-mountain or downhill riders seeking a compact, zero-degree stem that improves front-end feel, this stem delivers performance and value.

Key Features

• Material: Fully machined 6061T6 aluminum keeps the stem stiff and durable for aggressive riding while minimizing weight.
• Weight: At only 132g the stem reduces rotating mass up front, helping steering feel and overall bike responsiveness.
• Fit: Built for a 28.6mm 1-1/8 in steerer and 31.8mm bar, the stem fits common modern MTB setups without adapters.
• Length and Rise: The 35mm length with 0-degree rise gives a compact, neutral cockpit for technical trails and freeride control.
• Clamp Design: The Close Gap face plate and four-bolt bar clamp secure the handlebar firmly while making installation easier under correct torque.

Who It's For

The stem is best for mountain bikers who want a short, stiff stem for trail, downhill, freeride or all-mountain use and who already run a 1-1/8 in steerer and 31.8mm handlebar. Riders who prioritize a lightweight cockpit and sharper steering response will appreciate the 132g weight and CNC-machined build.

It is less suitable for riders needing any rise or a longer reach; those seeking adjustable rise or a longer stem for a more upright position should look at other stem lengths or rise options. Also riders with nonstandard steerer or bar diameters will require different parts or adapters.

Pros & Cons

Pros

• Excellent build quality and finish from machined 6061T6 aluminum.
• Very light at 132g, beneficial for handling and front-end feel.
• Secure four-bolt clamp and Close Gap face plate make for a tidy, solid installation.

Cons

• Zero-degree rise and 35mm length limit fit for riders who need more rise or reach.
• Made for specific diameters only, so it is not universal without adapters.

Specifications

Our Verdict

The FIFTY-FIFTY 35mm short stem is a concise, value-oriented upgrade for riders running a 1-1/8 in steerer and 31.8mm bars who want a lighter, stiffer front end. Its CNC-machined 6061T6 construction and low weight make it a smart choice for trail and downhill use, though riders needing rise or a longer reach should consider alternate lengths or models.

Frequently Asked Questions

Will this stem fit my bike?
If your steerer is 28.6mm 1-1/8 in and your handlebar is 31.8mm this stem will fit; other diameters require adapters or a different stem.

Is the stem strong enough for downhill use?
Yes, the machined 6061T6 alloy and four-bolt clamp design are intended for aggressive mountain use, including downhill and freeride.

Is installation difficult?
The Close Gap face plate and four-bolt clamp simplify installation, but correct bolt torque is important for a secure fit.