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SMKart
50mm Ultra Soft Axle for OTK Chassis
50mm Ultra Soft Axle for OTK Chassis
Couldn't load pickup availability
A kart axle is the solid bar that spins your rear wheels and carries the sprocket driven by the chain. This 50mm ultra soft version from SMKart flexes just the right amount under cornering loads so the tires stay planted longer, giving beginners more confidence and experts another tuning tool for quicker lap times.
Made from high-grade steel in a silver finish, the axle is a direct replacement for OTK chassis. It transfers engine power smoothly while its ultra soft stiffness lets the rear end work with the track instead of fighting it. Four-cycle or inboard brake setups use three AK003 and one AK004 inboard fasteners plus four AK003 outboard; keys are sold separately.
| Diameter | 50mm |
| Stiffness | Ultra Soft |
| Inboard Fasteners | 3x AK003 + 1x AK004 |
| Outboard Fasteners | 4x AK003 |
| Keys | Sold separately |
Racers pick this axle when they want controlled flex to improve grip on technical corners without sacrificing straight-line stability. Whether you are dialing in your first OTK rental kart or chasing tenths in a national series, the SMKart 50mm ultra soft axle delivers predictable handling you can trust.
▸ Product Highlights
- ✓Solid steel bar connects the rear wheels and carries the drive sprocket.
- ✓50 mm diameter axle is designed specifically for OTK chassis.
- ✓Ultra soft stiffness rating allows controlled flex for improved corner grip.
- ✓Silver steel finish with machined keyways for sprocket and brake rotor location.
- ✓Inboard brake or four-cycle setups require three AK003 and one AK004 fasteners.
- ✓Outboard brake setups use four AK003 fasteners.
- ✓Keys for sprocket and brake mounting are sold separately.
- ✓Direct replacement axle for standard OTK kart chassis.
- ✓Transfers engine power to the rear wheels while tuning rear grip.
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