Promax SL-1 Stem Lock
Best simple security solution for bicycle stem protection.
This component replaces the traditional star nut, offering a more secure and adjustable way to set headset tension. It simplifies maintenance and ensures a stable, reliable steering assembly for threadless setups.
$26.00
at
Airpark Bike Co
More SL-1 options
Who it's for
- Urban cyclists seeking to deter opportunistic component thieves.
- DIY bike owners wanting an easy security upgrade.
- Commuters worried about parts being stolen from their parked bicycles.
Who should skip it
- Performance-focused riders prioritizing every gram of weight savings.
- Cyclists with unique or non-standard bicycle stem configurations.
- Individuals needing comprehensive bicycle security for their entire bike.
Performance breakdown
Installation Simplicity
Eliminates the frustration of driving star nuts into carbon steerers.
Tension Stability
Maintains consistent headset preload even under aggressive riding conditions.
Build Quality
CNC-machined aluminum offers a premium, robust feel for front-end setups.
Maintenance Ease
Removable design makes swapping stems or servicing headsets incredibly straightforward.
Weight Penalty
Heavier than a standard star nut but worth the added reliability.
Compatibility Range
Perfectly fits standard 1 1/8 inch threadless systems across most bikes.
Key Specs
Weight
113 grams
Material
Aluminum
Finish
Anodized
Construction Method
CNC Machined
Steerer Tube Clamp Diameter
28.6 mm
Compatibility
1 1/8 inch threadless steerer tubes
Stem Type
Threadless
Intended Use
Cycling, Headset Maintenance
Know before you buy
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Ask Metto anything about the Promax SL-1 Stem Lock before you decide.
