Finding the proper gear ratio will allow you to also increase or decrease the go-karts output torque and top speed. Understanding the importance of optimal great ratios will enable you to maximize the efficiency and power output of your go-kart. Example:Ī go-kart with an engine/clutch sprocket (12 teeth) and a rear axle sprocket (75 teeth) has a gear ratio of 6.25 or 6.25:1. In order to find the gear ratio, locate both the number of teeth on the top and the left most column and trace the ratio accordingly. The first column on the left indicates the number of teeth on the rear axle sprocket. If you’re using a clutch, you’ll need to refer to the clutch sprocket instead. The top row refers to the amount of teeth on the engine sprocket of your go-kart. Reading the gear ratio chart is relatively simple. This chart shows the gear ratio for engine sprocket sizes from 8 – 20 teeth and axle sprocket sizes from 50 – 110 teeth. Here’s a comprehensive go-kart gear ratio chart that accounts for the most common sprocket sizes. Optional Values: Jackshaft Input Sprocket (Teeth) - The number of teeth on the input sprocket of your jackshaft (leading from the engine to the jackshaft) - Optional Jackshaft Output Sprocket (Teeth) - The number of teeth on the output sprocket of your jackshaft (leading out of the jackshaft to the rear axle) - Optional For more information, read the guide on how to read go-kart tire sizes. Tire Height (Diameter) - The height of your go-kart tires (Take the first number, for example: 11 x 6.00 - 5). If you’re running a clutch, use the number of teeth on the clutch sprocket instead.Īxle Sprocket (Teeth) - The number of teeth on the sprocket that is located on your rear axle. You’ll be able to find this value in your owner’s manual.Įngine Sprocket (Teeth) - The number of teeth on the engine/crankshaft sprocket. Required Values:Įngine RPM - The highest rpm value of the engine (for example, select 3,500 if the range is 2,800 to 3,500). You can refer to the description below for further reference. Two optional values are required if you have a jackshaft. There are four values that you have to input or select, in order for the calculator to determine your go-kart’s top speed and gear ratio. – How to Use the Gear Ratio and Speed Calculator There’s also an option to enable a jackshaft if you’re running a torque converter instead of a clutch. You can easily calculate your desired gear ratio and top speed of your go-kart by entering the engine speed, engine sprocket teeth, axle sprocket teeth and tire height. ![]() I’ve also included guides and tips, so that you can find the optimal gear ratio for your go-kart. To help you with that, I’ve created a go-kart gear ratio chart and speed calculator. However, finding the optimal gear ratio may not always be that easy and you’ll definitely need some tools. The gear ratio has a direct effect on the acceleration and top speed, which is a crucial element around corners and straight sections. An optimal gear ratio enables you to get the most out of your kart when racing on a track. One of the most crucial things to set up on a go-kart is an optimal gear ratio.
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