What is gearing?
Final drive ratio is the rear sprocket's tooth count divided by the front sprocket's. A higher ratio (bigger rear or smaller front) means sharper acceleration but lower top speed. A taller ratio favours top speed over drive.
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Motorcycle gearing calculator
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12-22 teeth on modern sportbikes.
35-55 teeth on modern sportbikes.
Distance from the front sprocket axis to the rear sprocket axis. Typically 570-650 mm on a sportbike. Not to be confused with the motorcycle wheelbase.
Width / aspect / rim (e.g. 200/55 R17). ≈ 1979 mm circumference.
Results
Computed live from your setup.
Final drive ratio
2.81
Rear / front. Higher = more acceleration.
Chain links
114
Rounded up to the nearest even link.
Theoretical speeds
| Gear | at 8,000 rpm | at redline (14500 RPM) |
|---|---|---|
| Gear 1 | 63 km/h | 114 km/h |
| Gear 2 | 81 km/h | 148 km/h |
| Gear 3 | 98 km/h | 177 km/h |
| Gear 4 | 113 km/h | 204 km/h |
| Gear 5 | 127 km/h | 230 km/h |
| Gear 6 | 142 km/h | 257 km/h |
Theoretical estimates that do not account for friction losses. Expect ±3-5% against real-world speeds.
Simulate a change
Compare your current setup with a variant.
Enable comparison to see how a sprocket change affects gearing.
Practical tips
Tap a tip to apply it in the comparison.
Understand
Motorcycle gearing, made simple
Front vs rear: which to change?
- Front sprocket Small toothed wheel on the gearbox output shaft. Swapping it takes 15 minutes and costs little. One tooth less shortens the ratio by roughly 6-8%.
- Rear sprocket Large toothed wheel on the rear wheel. Changing it may require re-tensioning or adjusting chain length. One extra tooth shortens the ratio by 2-3%, perfect for fine-tuning.
- The final ratio Final drive ratio = rear ÷ front. The higher the number, the sharper the acceleration and the lower the top speed.
520, 525 or 530 chain pitch
Pitch is the distance between two consecutive chain pins. The three standards share the same axial pitch (5/8″) but differ in internal width.
520
**520** — The lightest. Common for race conversions and sportbikes up to 1,000 cc used on track.
525
**525** — A good weight / strength compromise. OEM on many modern sportbikes (Panigale V2, ZX-6R, R6).
530
**530** — The strongest, but also the heaviest. OEM on big-bore bikes (R1, ZX-10R, GSX-R1000).
Steel vs aluminium
- Steel Durable: 60-100 trackdays on the track. The default pick for road use or regular trackdays without a dedicated components budget.
- Aluminium Lighter (40% less) but roughly 2.5× shorter lifespan (20-30 trackdays on the track). Save it for race-spec setups or trackdays with a dedicated budget.
Aluminium makes sense for pure racing or weight saving with a dedicated budget. For detailed tracking of tires, brake pads, chain and other track components, Read our motorcycle components wear guide.
Gearing for the circuit
Optimal gearing depends on the layout: short and technical vs long and fast.
- Technical circuitsGo shorter (ratio ~2.9-3.1) on Lédenon, Magny-Cours Club and twisty layouts. You gain corner-exit drive without bouncing off the limiter down the straights.
- Fast circuitsGo taller (ratio ~2.5-2.7) on Paul Ricard and layouts with long straights so you don't hit the limiter in 6th gear.
Chain length calculation
Swapping the front or rear sprocket shifts the chain's resting position. The calculator estimates the chain length in links (rounded up to the nearest even) so you can buy the correct chain without doing the maths yourself.
Go further with Tarmago
Save your setups, track chain and sprocket wear, and link each gearing config to a trackday in your rider logbook.
Create my free accountMotorcycle gearing FAQ
How do you change a motorcycle's gearing?
Replace the front sprocket, the rear sprocket, or both. The front sprocket takes about 15 minutes (remove the cover, unscrew the central nut). The rear sprocket means dropping the rear wheel. Most riders adjust gearing while replacing the full chain kit.
What's the impact of one tooth more or less?
One front tooth less shortens gearing by roughly 6-8%: strong acceleration gain, noticeable top-speed loss. One extra rear tooth shortens by 2-3%: a finer adjustment, ideal for tuning the bike to a given circuit without upsetting the overall balance.
Should I replace the chain together with the rear sprocket?
Yes, in 95% of cases. A worn chain paired with a fresh rear sprocket will eat the new sprocket within a few thousand kilometres. Standard practice is to replace the full kit (chain + front + rear) together, especially on track.
Aluminium or steel rear sprocket?
Aluminium saves 300-500 g of unsprung mass — you feel it in agility and acceleration. The downside: 2-3× shorter lifespan than steel. Pick aluminium only for race-spec or trackday-dedicated bikes with an open components budget.
Is there an ideal gearing?
No. OEM gearing is a road / track compromise. On track, riders usually shorten by one or two teeth for better acceleration, then fine-tune by circuit (short and technical vs long and fast) and riding style. No setup wins for everyone.
520, 525 or 530 chain pitch — which one?
Default to your bike's OEM pitch. On track-only setups, 520 is favoured on sportbikes up to 1,000 cc for its lighter weight (less friction, less unsprung mass). 525 is the best weight / strength compromise for mixed use. 530 is reserved for big-bore road bikes.