How to Choose 6301-2RS Motorcycle Bearings for Brazil's Honda CG Market

The 6301-2RS is the single highest-volume motorcycle bearing in Brazil — front wheel hub for Honda CG125/CG150/CG160 Titan. Here is exactly what dimensions, seal, clearance, and grease fill to verify before paying.

Walk into any motorcycle parts shop from São Paulo's Brás district to a small town in Minas Gerais and ask for a front wheel bearing for a Honda CG. The shopkeeper will almost always reach for the same code: 6301-2RS. It is the most-stocked motorcycle bearing in Brazil for one simple reason — it fits the front wheel of the Honda CG125 Titan, CG150 Titan, and CG160 Start, the three best-selling motorcycles in the country for the past 30 years.

Because the SKU is so common, it is also the SKU most commonly counterfeited. Before you place a 1,000+ pcs order, run through the following checks.

Dimensions — what you actually pay for:

6301-2RS dimensions are fixed by ISO 15: bore 12mm, outer diameter 37mm, width 12mm. Tolerance class P0 (or 'normal') is the standard for motorcycle wheels. Cheaper bearings sometimes ship at P0 tolerance on paper but +20–30μm out of spec in practice. Ask your supplier for the dimensional inspection report on a sample lot — bore, OD, width measured on a coordinate measuring machine, not just a caliper photo.

Seal type — why -2RS, not -ZZ, in Brazil:

Two letters after the dash matter. '-2RS' means rubber contact seal both sides (usually NBR or HNBR). '-ZZ' means metal shield both sides — no contact, no real moisture barrier. In Brazil's rainy season (December–March), and especially in the Northeast where motoboys ride through unpaved side streets, ZZ-sealed bearings fail in weeks. The 2RS rubber seal seats against the inner ring and physically stops water, mud, and brake dust from reaching the grease.

Internal clearance — CN is standard for wheels:

6301-2RS for motorcycle wheels should ship with CN clearance (the 'normal' or 'standard' radial play, typically 6–20μm for this size). Do not order C3 for wheel applications — C3 is intended for high-temperature operation (pump motors, electric motors). A C3 bearing in a wheel runs with excess play, makes a slight noise on rotation, and wears out faster. Some sellers will quote you a 'better' C3 6301 at a higher price — this is a misunderstanding, not an upgrade.

Grease fill — the silent quality variable:

Industry standard is 25–35% of the bearing's free space, filled with NLGI grade 2 lithium-complex grease. Cheap bearings often ship with 15–20% fill — visually it looks the same through the seal, but in Brazil's tropical heat the under-filled bearing runs hot, the grease drains down to the lower half, and the upper races wear unevenly within months.

Counterfeit markings to watch for in Brazil:

Counterfeit SKF, NSK, and even fake KOYO 6301-2RS circulates heavily in São Paulo's Pari district and along the BR-116 supply route. Three quick tells: (1) genuine boxes have a printed batch code that traces to the country of origin — counterfeits print a generic serial that never decodes, (2) genuine logo etching on the inner ring is laser-cut and uniform — counterfeits often show ink or shallow stamping, (3) genuine bearings spin freely with light, even resistance — counterfeits often have grit you can feel as a slight pulse during the rotation test.

Pre-order checklist before paying:

1. Dimensional inspection report on a 20-pc sample.

2. Material certificate stating GCr15 chrome steel (not carbon steel).

3. Grease fill confirmation in writing (target 28–32%, NLGI 2 lithium-complex).

4. Batch number on every carton — same batch, single shipment.

5. ISO 9001 reference number for the manufacturing source.

6. Photos of the actual cartons you will receive, with batch code visible — not stock photos.

FULI's 6301-2RS standard specification: GCr15 chrome steel, P0 tolerance with dimensional check, CN clearance, NBR -2RS double seal, 28–32% grease fill, NLGI 2 lithium-complex grease, batch-traceable. Sample kit (10 pcs) available before bulk order. WhatsApp +86 152 6352 1305 for Brazilian-Portuguese spec sheet.