FIFTY-FIFTY Aluminum Alloy Mountain Bike Stem 35mm - Super Light

In this review the FIFTY-FIFTY Aluminum Alloy Mountain Bike Stem is evaluated as a short 35mm stem aimed at riders who want a lighter, stiffer front end for all-mountain, downhill and freeride use. The single biggest reason to consider it is weight savings combined with a precise fit: at only 132g and machined from 6061T6 aluminum, it offers a noticeable reduction over many stock stems without sacrificing a secure four-bolt clamp. This review focuses on fit, finish, installation and on-trail performance for riders upgrading from heavier or generic stems.

Key Features

• Material: Fully CNC machined 6061T6 aluminum provides a durable, stiff body that resists flex under hard riding.
• Weight: At 132g the stem reduces rotating mass and contributes to a more responsive front end on technical trails.
• Fit: Designed for a 28.6mm (1-1/8') steerer and 31.8mm handlebar, it offers a direct replacement for common modern MTB setups.
• Length & Rise: The short 35mm length with 0-degree rise keeps the rider in a compact, aggressive position suited to downhill and freeride.
• Installation: The close-gap face plate and four-bolt clamp simplify bar installation and help achieve even torque without slippage.
• Finish: Machined finish and tidy edges make for a clean look that customers described as high quality.

Who It's For

The stem is best for all-mountain, downhill and freeride riders who want to trim grams and sharpen handling while keeping a strong, reliable clamp interface. Riders upgrading from heavier stock stems will notice a tangible difference in front-end feel and a compact cockpit suited to technical descents.

It is less appropriate for riders who need a long reach or any rise, those running nonstandard bar or steerer sizes, or riders seeking an adjustable-angle stem. If you need more than 35mm length or positive/negative rise, look elsewhere.

Pros & Cons

Pros

• Exceptionally light at 132g, improving responsiveness without major cost.
• Solid CNC machining and finish, customers praise the build quality and appearance.
• Secure four-bolt clamp and close-gap face plate make installation straightforward and reliable.
• Direct fit for common 31.8mm bars and 1-1/8' steerers, making upgrades simple.

Cons

• Short 35mm length and 0-degree rise limit fit options for riders who need more reach or a different cockpit height.
• Specification focused; riders requiring integrated spacers or proprietary fitments must source separately.

Specifications

Our Verdict

The FIFTY-FIFTY 35mm aluminum stem is a practical, lightweight upgrade for riders focused on downhill and freeride performance who use standard 31.8mm bars and 1-1/8' steerers. It pairs excellent machining and a secure four-bolt clamp with low mass, delivering clear handling gains for its price and making it good value for riders replacing heavier stock stems.

Frequently Asked Questions

Will this fit my bike with a 1-1/8' steerer?
Yes, the stem is designed for a 28.6mm (1-1/8') steerer and will fit standard forks using that diameter.

Is the 35mm length suitable for downhill use?
Yes, the short 35mm length and 0-degree rise suit an aggressive, compact position preferred for downhill and technical riding.

How easy is installation?
The close-gap face plate and four-bolt clamp simplify installation and allow even torque across the bar for a secure fit when tightened to the correct spec.