One tooth can make a large change.
Changing the countershaft sprocket often makes a bigger gearing move than changing the rear by one tooth. It also requires careful clearance and front pattern verification.
Motocross Gearing Chart
Front and rear sprocket ratios for 520 chain setups.
Use this chart to understand how front sprocket and rear sprocket tooth counts change final drive ratio before moving into Langbiang Gravity fitment verification.
Ratio Reference
Dirt bike gearing chart.
Final drive ratio is calculated by dividing rear sprocket teeth by front sprocket teeth. Higher ratios usually feel shorter and stronger off the bottom. Lower ratios usually feel taller and calmer at speed.
This is a ratio reference only. It does not confirm fitment, chain length, clearance, or production compatibility for Honda CRF, Yamaha YZ, Kawasaki KX, KTM SX-F, Suzuki RM-Z, or other motocross models.
| Front | Rear | Ratio | Gearing feel |
|---|---|---|---|
| 12T | 50T | 4.17 | Very short drive |
| 13T | 48T | 3.69 | Balanced baseline |
| 13T | 49T | 3.77 | More pull |
| 13T | 50T | 3.85 | Stronger drive |
| 13T | 51T | 3.92 | Shorter response |
| 14T | 50T | 3.57 | Taller roll |
| 14T | 52T | 3.71 | Smooth track drive |
Fine tune drive, torque, and track response.
Rear sprocket tooth count is useful for tuning corner exit, starts, and gear spacing. The rear hub interface, bolt circle, center bore, and chain pitch still need to match.
Pitch is the first lock.
A 520 chain motocross sprocket must match the chain pitch first, then the front or rear fitment pattern, tooth count, and model-year guidance.
Find Your Sprocket
Use the chart, then verify the bike.
Search by make, model, year, and model type in the dedicated Langbiang Gravity sprocket finder. Public LBG SKU guidance helps the conversation; private geometry stays protected in the fitment workflow.
Fitment Notes
Compatibility still comes before production.
How is a motocross sprocket ratio calculated?
Divide rear sprocket teeth by front sprocket teeth. Example: 50 rear teeth / 13 front teeth = 3.85.
Does a larger rear sprocket improve acceleration?
Usually yes. A larger rear sprocket makes the gearing shorter, which can increase drive feel and reduce top speed in that gear.
Can this chart confirm fitment?
No. Final sprocket compatibility must be verified before production or purchase, including chain pitch, front or rear geometry, clearance, and model-year application.