How to Calculate the Perfect Pulley Ratio

How to Calculate the Perfect Pulley Ratio & Top Speed Want to know how fast your lawn mower, go-kart, or other belt-driven project will go before buying new pulleys? In this video, I explain how to calculate pulley ratios, estimate your top speed, measure your gearbox ratio, choose the correct belt size, and select the best pulley combination using my racing lawn mower as a real-world example. Chapters 00:00 Intro 01:34 Racing Mower Gearbox 04:40 Brake Setup 05:31 Calculate Top Speed 06:38 Measure Gearbox Ratio 08:42 Easy Speed Formula 09:49 Belt Size Calculation 12:50 Test Drive Results Whether you're building a racing lawn mower, go-kart, mini bike, or any belt-driven project, these calculations can save you time, money, and a lot of trial and error. In this video you'll learn: How pulley ratios work How to calculate top speed How to measure your gearbox ratio How to choose the correct belt size How pulley swaps affect torque and speed Real examples from my racing lawn mower build 👍 If this video helped you, consider subscribing for more racing lawn mower builds, fabrication, engineering projects, and racing content!