### Author Topic: Twists extremely simple guide to calculating gear ratios...  (Read 2555 times)

#### Twist

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##### Twists extremely simple guide to calculating gear ratios...
« on: December 04, 2015, 11:18:23 AM »

Calculating gear ratio: for this formula you will need to count the teeth specified. Sector out/ spur in * spur out/ bevel in * bevel out/ pinion in = Your exact ratio : 1. For a visual example here are the calculations from a standard 18:1 gearset. 32/20 * 39/10 * 30/10 = 18,72 ~ 18:1

Estimating RPS changes due to ratio changes: with this formula you will be able to create a theoretical estaminet on how your RPS will change if you ONLY switch your gears (NOTE: shimming DOES affect this calculation). This one is a bit different to explain so I'm going to use an example using standard 18:1's as the subject. So let's say that you are currently obtaining 20 RPS on your stock 18:1's, you would take your exact ratio 18,72 X 20 = 374,4 / second. Now you decide you want to switch to 16:1's ==>; 374,4 / 16 = 23,40 RPS, so theoretically you are obtaining an increase of 3,40 RPS with your new gears.

I hope that this guide helped some of you new comer tech's!
« Last Edit: December 04, 2015, 11:25:39 AM by Twist »