Go-Kart Bearings

For wheels, the 6905 (25×42×9 mm) is the most widely used 25 mm kart wheel bearing, the 6905-12 (25×42×12 mm) is the original fitment in OTK / Tony Kart hubs, and the 6003 (17×35×10 mm) suits 17 mm spindles. Rear axles normally use a 50 mm insert bearing — SB208-50 (50×80 mm) or SB210-50 (50×90 mm) with set screws and C4 clearance. Engines such as ROK GP, IAME X30 and Rotax Max use a 6206 (30×62×16 mm) main crankcase bearing, and steering systems use PB8 / PB10 uniballs and COS8 (M8×1.25) rod ends. OTT makes all of these.

For competitive racing where every fraction of a second matters, open bearings (no shields or seals) provide the lowest friction and highest speed. For recreational, rental, or indoor karts that need extended maintenance intervals, sealed (2RS) bearings are recommended — they keep grease in and contaminants out. Shielded (ZZ) bearings offer a middle ground with moderate protection and lower drag than rubber seals.

The MOQ for OTT go-kart bearings is 10 pieces per model, so kart shops, racing teams and small distributors can order exactly what they need. Kart manufacturers and distributors ordering larger volumes get volume pricing — send the models and quantities for a quote.

OTT is a bearing manufacturer with its own factory, not a trading company. We control the entire production process from raw material (GCr15 bearing steel) through heat treatment, grinding, assembly, and quality testing. Our factory holds IATF 16949, ISO 14001, and ISO 45001 certifications.

Beyond standard deep groove ball bearings (6000, 6200, 6300 series), OTT manufactures rod end bearings (COS series) for tie rods, uniball bearings (PB series) for steering shafts, and insert bearings with set screws for rear axle housings. This makes OTT a one-stop source for all karting bearing needs.

Yes. OTT offers OEM branding and custom packaging for kart bearing distributors. We can laser-engrave your brand name on the bearing and provide branded packaging. Many of our distributor clients in Europe sell under their own brand with OTT manufacturing behind the product.