OTK Rear Hub D50 x 77mm Magnesium

The OTK Rear Hub D50 x 77mm Magnesium is a genuine OTK magnesium rear wheel hub designed for compatible OTK-based kart chassis using a 50mm rear axle. This shorter 77mm magnesium hub is used to mount the rear wheel to the axle and is a popular choice for chassis setup, race preparation and replacement use. Sold individually as a genuine OTK spare part.

Rear hub length and material are both relevant factors in kart chassis setup. The length of the rear hub affects how rigidly the rear wheel is positioned relative to the axle, which in turn influences how the rear of the kart behaves on track. A shorter rear hub such as this 77mm option is often selected when track conditions offer higher grip levels, or when the driver wants to free up the rear of the kart and improve rotation through corners. Magnesium hubs are widely used in karting for their combination of strength and low weight, making them a practical choice for race setup, fine-tuning and replacement across a range of engine classes and track conditions.

Key features:

• Genuine OTK spare part
• OTK part number: 0046.E0
• Magnesium construction for strength and low weight
• 50mm diameter — designed for 50mm rear axles
• 77mm length — short rear hub option
• Rear wheel hub for mounting the rear wheel to the axle
• Suitable for compatible OTK-based chassis using a 50mm rear axle
• Sold individually

Product details:

• Brand: OTK
• Part number: 0046.E0
• Type: Rear wheel hub
• Material: Magnesium
• Axle diameter: 50mm
• Hub length: 77mm
• Design: Short rear hub
• Quantity: Sold individually
• Wheel nuts, wheel, tyre, axle, axle key and fixings are not included

Setup note:

Rear hub length is a tuning variable used by mechanics and drivers to adjust how the rear of the kart behaves. A shorter hub such as this 77mm option reduces the lateral stiffness at the rear wheel, which can help free up the rear of the kart and improve rotation, particularly on higher grip tracks or in conditions where the rear is overworking. Hub length selection should always be considered alongside other setup variables including axle stiffness, tyre choice and track conditions. If you are unsure which hub length is correct for your setup, consult your mechanic or chassis documentation.

Fitment note:

This rear hub is designed for compatible OTK-based kart chassis using a 50mm rear axle. Before ordering, customers must verify the following:

• Chassis model and manufacturer
• Rear axle diameter (50mm required)
• Required hub length for your setup
• Axle keyway specification
• Wheel fitment and bore compatibility
• Class regulations and technical requirements

This part is not suitable for every kart. It is intended for compatible OTK-based chassis where part number 0046.E0 and the 50mm x 77mm specification are confirmed correct.

Ideal for:

• Tony Kart chassis using a 50mm rear axle
• Kosmic chassis using a 50mm rear axle
• Exprit chassis using a 50mm rear axle
• LN Kart chassis using a 50mm rear axle
• Redspeed chassis using a 50mm rear axle
• EOS chassis using a 50mm rear axle
• Gillard chassis using a 50mm rear axle
• CS55 chassis using a 50mm rear axle
• Drivers and mechanics looking to tune rear grip and rotation using hub length
• Race preparation, testing and replacement use on compatible OTK-based chassis
• Any compatible OTK-based chassis where part number 0046.E0 and the 50mm x 77mm specification are confirmed correct

If you are unsure whether this hub is correct for your chassis or setup, check your existing rear hub part number or consult your chassis documentation before ordering.