This Universal Parts 12mm Axle Adjuster Set (SKU 103-32, MPN 4948) keeps your drive chain properly tensioned and your rear wheel centered in the swingarm. Sold as a left and right pair with washers and lock nuts, these zinc-plated steel adjusters are a heavy-duty upgrade over the thin factory tensioners on many mini bikes, pocket bikes, and pit bikes. The fine M6 x 1.0 thread gives precise, repeatable adjustment, so you can turn each side the same amount and keep the axle square.
Features
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Zinc-plated steel: Resists corrosion so the threads stay smooth after mud and rain.
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12.4mm bore: Slides over standard 12mm axles without binding.
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Fine-pitch thread: M6 x 1.0 rod for precise, repeatable chain tension.
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Complete hardware: Washers and lock nuts included so settings will not vibrate loose.
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Left and right pair: Sold as a set of 2.
Specifications
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Part number: 103-32
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MPN: 4948
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Axle size: 12mm
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Inner diameter: 12.4mm
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Overall length: 68.4mm
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Thread: M6 x 1.0
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Finish: Zinc-plated steel
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Quantity: Set of 2 (left and right)
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Brand: Universal Parts
Model Fitment
| 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 |
Razor MX500/MX650 rear axle and similar e-moto platforms |
Measure your rear axle before ordering. These adjusters fit 12mm axles only, with a 68.4mm overall length and M6 x 1.0 thread.
Installation Notes
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, then tighten the lock nuts.
