Tech Talk | Sprocket and Gearing Tips | MP1 Suspension
By Mike Parliament
SPROCKET AND GEARING TIPS
If you’re considering upgrading your bike’s drive parts, you’ll need to factor in what type of bike as well as your style of riding and racing. Generally, when upgrading or looking for an advantage focus on gearing changes as well as what type of chain best fits your bike and riding conditions. It is recommended that you change the sprockets and chain together.
Here are some tips on sprocket sizing depending on what you’re looking to accomplish with your bike:
For Faster Acceleration (more bottom end)
- Use a small front sprocket or larger rear sprocket. For every 1 tooth you change on the front, it’s the equivalent to changing 3-4 teeth on the rear.
- It creates a lower gearing ratio. This is ideal for tight trail riding or tracks without many long straight sections. A lower gear ratio works well for Arenacross as opposed to wide open outdoor tracks.
For Faster Top Speed (more top end)
- Use a larger front sprocket or smaller rear sprocket. Again, changing the front makes a larger impact to your gearing than changing the rear.
- It creates a higher gearing ratio. Higher gearing ratios work well in high speed situations such as sandy motocross tracks or anywhere that doesn’t have many tight turns.
As a general rule, for every tooth change on the front sprocket you’re changing the rear sprocket by approximately 3-4 teeth. If you’re just looking for a subtle change in your gearing, add or reduce 1-2 teeth on the rear sprocket.
To turn the rear sprocket once, the counter shaft sprocket has to spin the number of times in the “ratio” column. (see gear ratio image)
Example, a 30-tooth rear sprocket and a 10-tooth front sprocket equals a 3.00 gearing ratio or three rotations on the front for every one rotation on the rear.
If you would like more information or help with your set up, contact Mike Parliament at MP1 Suspension: firstname.lastname@example.org