Question 1

What is a snowmobile gear ratio?

Accepted Answer

The snowmobile gear ratio is the ratio between the number of teeth on the bottom (driven) gear and the top (drive) gear in the chaincase. It determines the trade-off between the snowmobile's acceleration and its theoretical top speed.

Question 2

What does a lower gear ratio number mean?

Accepted Answer

A lower numerical ratio (e.g., 1.90) means the sled is 'geared up.' This will result in a higher theoretical top speed but slower acceleration. This is ideal for lake racing or long, flat, groomed trails.

Question 3

What does a higher gear ratio number mean?

Accepted Answer

A higher numerical ratio (e.g., 2.25) means the sled is 'geared down.' This will result in quicker acceleration and more low-end torque but a lower theoretical top speed. This setup is preferred for mountain riding, deep powder, or tight, twisty trails.

Question 4

How do I find out how many teeth are on my gears?

Accepted Answer

The tooth count is usually stamped directly onto the face of the gear. If it's not visible, you will need to remove the chaincase cover and manually count the teeth on both the top and bottom sprockets.

Question 5

Can I change my gear ratio?

Accepted Answer

Yes, changing your gear ratio is one of the most common performance modifications. You can buy aftermarket gears with different tooth counts to tune your sled's performance. You may also need a new chain. We recommend our Chain Center Distance Calculator for this.

Question 6

Does changing gears affect my speedometer?

Accepted Answer

Yes, on many models, the speedometer sensor reads the rotation of the driveshaft. Changing your gear ratio will alter its speed relative to the engine RPM, making your speedometer inaccurate unless it is recalibrated.

Question 7

What is the stock gear ratio for my snowmobile?

Accepted Answer

The stock gear ratio varies widely by make, model, and year. The best way to find it is to consult your owner's manual or look up the specifications for your specific sled online.

Question 8

What's more important: gearing or clutching?

Accepted Answer

They are both critical and work together. Your clutching determines how efficiently your engine's power is transferred, while gearing determines how that power is applied to the track. A perfectly clutched sled will still perform poorly if it's geared incorrectly for the conditions, and vice versa.

Question 9

How much does it cost to change a gear ratio?

Accepted Answer

The cost can vary, but typically a set of two high-quality gears will cost between $100 and $200. If you also need a new chain and chaincase oil, you should budget for an additional $50 to $100.

Question 10

Is a lower or higher gear ratio better for fuel economy?

Accepted Answer

Generally, a lower numerical ratio (geared for higher top speed) can lead to better fuel economy during steady cruising on flat trails, as the engine will be at a lower RPM for a given speed. However, aggressive acceleration will always consume more fuel regardless of gearing.

Question 11

What happens if I gear my sled too low (high number)?

Accepted Answer

If you gear down too much, your sled will accelerate very hard but will 'run out of gear' quickly, hitting the engine's rev limiter at a relatively low top speed. This can be frustrating on open trails.

Aspect	Higher Ratio (Geared Down)	Lower Ratio (Geared Up)
Acceleration	Excellent - Quick off the line	Slower - Takes time to build speed
Top Speed	Limited - Hits rev limiter early	Higher - Can reach full potential
Deep Snow	Excellent - Won't bog down	Poor - May struggle to climb
Fuel Economy	Higher RPM for cruising	Lower RPM for cruising

Snowmobile Gear Ratio Calculator

Understanding Your Snowmobile Gear Ratio

The Formula

Higher Ratio (e.g., 2.4)

Lower Ratio (e.g., 1.9)

How Gear Ratio Affects Performance

Choosing a Gear Ratio for Your Riding Style

Trail Riding

Mountain/Powder

Lake Racing

Popular Model Examples

Polaris RMK (Mountain)

Ski-Doo MXZ (Trail)

Arctic Cat ZR (Performance)

Yamaha Sidewinder (Turbo)

Frequently Asked Questions About Gearing