Keep your drive chain properly tensioned and your rear wheel centered with this Universal Parts 12mm Axle Adjuster Set. Sold as a pair with integrated washers and lock nuts, these zinc-plated steel adjusters are a heavy-duty upgrade over the thin factory tensioners found on many mini bikes, pocket bikes, and pit bikes. The M6x1.0 threaded rod gives you fine, repeatable adjustment — turn each side equally to keep the axle square in the swingarm.
Key Features
Zinc-plated steel — corrosion resistant, threads stay smooth after mud and rain exposure
12.4mm inner diameter — smooth slide-on fit over standard 12mm axles without binding
M6 x 1.0 threaded rod — fine pitch for precise, repeatable chain tension adjustment
Includes washers and lock nuts — complete hardware, settings won’t vibrate loose
Sold as a set of 2 (left and right)
Specifications
Axle Compatibility: 12mm
Inner Diameter: 12.4mm
Overall Length: 68.4mm
Thread Pitch: M6 x 1.0
Finish: Zinc-plated steel
Quantity: Set of 2 (left & right)
SKU: 103-32 | MPN: 4948
Compatibility
Vehicle Type
Compatible Models
Mini Bikes
Mega Moto 80/105, MotoVox MBX10, Monster Moto 80cc, Coleman CT100U
Pocket Bikes
47cc/49cc MTA1 (Cagliari), MTA2, Lucky 7 Series
Dirt / Pit Bikes
Coolster, Roketa, TaoTao 70cc–125cc models with 12mm axles
Electric Scooters
Razor MX500/MX650 rear axle and similar e-moto platforms
Installation tip: Aim for 15–20mm of vertical play at the center of the chain. Turn each adjuster an equal number of turns to keep the rear wheel centered in the swingarm.
California Prop 65 Warning: www.p65warnings.ca.gov
