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When a worn or undersized sprocket causes chain skip, premature wear, or misalignment in your drive system, finding an exact-fit replacement matters. Whether you are a maker building a custom go-kart, a technician repairing light conveyor equipment, or a hobbyist assembling a bicycle-derived drivetrain, the right tooth count and bore size are non-negotiable. These 04C chain drive sprockets are engineered specifically for #25 (04C) roller chain and cover the full practical range from 9T to 50T in a single product line.
Each sprocket is machined from carbon steel with a hardened tooth surface for extended service life. The pitch diameter ranges from approximately 21.5 mm (0.85 in) on the 9T variant up to 63.5 mm (2.50 in) on the 50T variant, with bore dimensions varying by tooth count — see variant options for exact bore specs. The #25 chain pitch is 6.35 mm (0.25 in), and all sprockets conform to ANSI #25 / ISO 04C chain standards.
Typical applications include small go-kart and mini-bike final drives, light-duty conveyor and indexing mechanisms, robotics and automation prototype builds, and replacement sprockets for garden equipment with #25 chain drives. Long-tail use cases such as "#25 chain sprocket replacement for go-kart" and "04C roller chain drive sprocket 9 tooth to 50 tooth" are all covered within this single listing.
A single listing covers 9T through 50T, letting you dial in your exact gear ratio without sourcing from multiple suppliers.
Tooth profile and pitch are machined to ANSI #25 chain tolerances, ensuring smooth engagement and minimal chain wear.
Tooth surfaces are hardened for resistance to wear and deformation under cyclic loading in drive applications.
Pitch diameters span 21.5 mm (0.85 in) to 63.5 mm (2.50 in) across the range, with each variant machined to consistent dimensional tolerances.
Suited for go-karts, mini-bikes, light conveyors, robotics prototypes, and garden equipment — anywhere #25 chain is the drive standard.
Each unit is sold as a single sprocket, so you order exactly the quantity you need — no forced multi-packs.
| Chain Standard | ANSI #25 / ISO 04C |
|---|---|
| Chain Pitch | 6.35 mm (0.25 in / 1/4 in) |
| Tooth Count Range | 9T – 50T (select variant) |
| Pitch Diameter Range | 21.5 mm – 63.5 mm (0.85 in – 2.50 in) |
| Material | Carbon steel, hardened tooth surface |
| Bore Diameter | See variant options |
| Hub Style | See variant options |
| Finish | See variant options |
| Packing Quantity | 1 pc |
Your gear ratio is determined by dividing the driven sprocket tooth count by the drive sprocket tooth count. For example, a 9T drive sprocket paired with a 36T driven sprocket gives a 4:1 reduction. Measure your existing sprocket's tooth count and pitch diameter, or calculate the ratio you need, then select the matching variant from the Size dropdown above.
Yes — all sprockets in this listing are machined for ANSI #25 / ISO 04C roller chain with a 6.35 mm (1/4 in) pitch. They are not compatible with #35 (9.525 mm pitch), #40 (12.7 mm pitch), or any other chain size. Verify your chain's pitch before ordering.
Bore diameter varies by tooth count. Please refer to the variant detail page or contact us to confirm the bore size for your specific tooth count before ordering, especially if you need a precise shaft fit.
The sprockets are made from carbon steel with hardened tooth surfaces, which provides solid resistance to tooth deformation and wear under the cyclic loads typical of go-kart, mini-bike, and light conveyor drives. For exact load ratings, contact us with your application details.
Carbon steel sprockets offer moderate corrosion resistance suitable for indoor and dry outdoor environments. For wet or corrosive environments, we recommend applying a chain lubricant regularly and considering a protective coating. If your application demands higher corrosion resistance, contact us to discuss material options.
Yes — #25 chain drive sprockets are a standard choice for go-kart and mini-bike final drives. Select the tooth count that matches your desired top speed and torque ratio. Common go-kart setups use a small drive sprocket (9T–12T) on the engine and a larger driven sprocket (30T–50T) on the rear axle.
Larger tooth-count sprockets require more material and machining time, which is reflected in the higher price for 45T–50T variants. The 9T–30T range is priced lower per unit. Select your tooth count above to see the exact price for each variant.
