Promax SL-1 Stem Lock
Best durable steering stabilizer for serious BMX racers.
Ditch the finicky star nut for a rock-solid connection that keeps your headset tension locked in place. It’s a simple, mechanical upgrade that trades the frustration of constant adjustments for a front end that stays tight and responsive, no matter how hard you ride.
$29.95
at
J&R Bicycles
More SL-1 options
Who it's for
- BMX riders seeking extra safety during high-impact landings
- Home mechanics wanting a more stable front-end setup
- Weight-conscious racers requiring reliable and long-lasting hardware
Who should skip it
- Cyclists with solid or non-standard tapered steer tubes
- Casual users preferring a simple plug-and-play component
- Extreme weight-weenies prioritizing every gram of weight savings
Performance breakdown
Steering Stability
Locks the headset firmly to eliminate unwanted play during aggressive riding.
Installation Simplicity
Straightforward design makes replacing traditional star nuts a hassle-free upgrade.
Build Durability
Robust construction ensures long-term reliability under consistent front-end stress.
Tension Consistency
Maintains precise headset preload far better than standard compression systems.
Compatibility Range
Strictly limited to 1-inch steerer tubes, restricting use on modern bikes.
Weight Penalty
At 227 grams, it adds noticeable heft compared to lightweight alternatives.
Steering Stability
Locks the headset firmly to eliminate unwanted front-end play.
Installation Simplicity
Straightforward design makes upgrading from star nuts quick and painless.
Build Durability
Robust construction ensures long-term reliability under intense riding conditions.
Tension Consistency
Maintains precise headset preload far better than traditional compression systems.
Weight Penalty
At 227 grams, it adds noticeable mass compared to lightweight alternatives.
Compatibility Range
Strictly limited to 1-inch steerer tubes, excluding modern tapered standards.
Key Specs
Weight
227 grams
Material
7075 Aluminum Alloy
Construction
Cold forged and CNC-machined
Steerer Tube Diameter
1 inch (25.4 mm)
Steerer Tube Clamp Diameter
25.4 mm
Compatibility
1 inch and 1-1/8 inch steerer tubes
Mounting Type
Stem
Know before you buy
Still have a question?
Ask Metto anything about the Promax SL-1 Stem Lock before you decide.
