Blackbearing D21 47.8x56.8x6.5mm 45/45° Headset Bearing

D21 Angular Contact Bearing for Headset Replacement

Chrome Steel Construction
Low-Friction Seals
Premium Bearing Grease

₹3,050

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Delivery estimate

The BlackBearing D21 Headset Bearing is a replacement cartridge bearing designed for bicycles with a matching headset assembly. It is suitable for cyclists and mechanics replacing worn, rough-running or damaged steering bearings without changing the complete headset. Its chrome steel construction provides a durable alternative for routine headset maintenance.

Smooth Steering. The bearing uses chrome steel races and balls, supported by grease and low-friction seals. This construction helps maintain consistent steering movement while limiting contamination from dirt and moisture. Replacing a worn bearing can help restore smooth handlebar rotation and eliminate roughness caused by bearing deterioration.

Correct Compatibility. Headset bearings are not universally interchangeable. Before purchasing, compare the existing bearing's dimensions and contact angles with the replacement. Both measurements must match the headset arrangement to ensure proper seating and steering operation. Installation should be carried out carefully to avoid damaging the bearing or surrounding headset components.

Specifications

Bearing Design	Angular Contact Cartridge
Material	Chrome Steel
Seal Type	Low-Friction RS Seal
Lubrication	Premium Bearing Grease
Dimensions	47.8×56.8×6.5mm

Inner Diameter (ID)	47.8mm
Outer Diameter (OD)	56.8mm
Bearing Width	6.5mm
Contact Angle	45°/45°

Features

Chrome Steel Construction: Provides durable bearing surfaces for repeated steering movement.
Low-Friction Seals: Help prevent dirt and moisture from reaching the internal components.
Premium Bearing Grease: Supports smooth rotation and reduces internal friction.
Sealed Cartridge Design: Allows individual bearing replacement without changing the complete headset.
Angular Contact Construction: Supports steering loads when correctly seated in a compatible headset.

Warranty and support

Covered by the manufacturer's warranty. Warranty claims go through us and we deal with the brand for you.

Questions after delivery? Ask TBA Guide or WhatsApp us.

Shipping and returns

We ship across India. Shipping is free on orders above ₹2,000 and ₹99 below that. Cash on delivery is available on orders up to ₹20,000, with a COD charge that depends on the order value. For a delivery estimate, enter your pincode in the box above the add-to-cart button: it shows the courier's own estimate for your address, not a promised date. If a parcel is held up we chase the courier until it is delivered. Full shipping policy

Returns can be started within 7 days of delivery on unused items in their original condition with all tags and packaging. Apparel, helmets, gloves and similar items are returnable; wetsuits and products discounted by more than 5% are not. Compatibility questions are not grounds for a return unless our listing was wrong, so ask us before you order if you are unsure. Return shipping is arranged by you; on an accepted return you can choose an exchange, store credit or a refund after shipping and transaction charges. Orders can be cancelled only until they are processed. Full return and refund policy