# Max-Speed vs. Hill-Climb Charts

The Evolve-Guy made a video going up a 30-35% hill with a Carbon GT

He used 80mm wheels and the 38t Drive-Gear to get max torque. With this setup the max speed of the board is reduced to below 30 km/h. I made a few charts to show how much of a hill you can go up with different gearing und what power is needed:

Watt is the power the drive-drain have to handle at your hill-climb-speed (huge amp draw), not max motor power at full RPM

And the next time you see a random chinese board claiming insane precs, throw them against these charts to prove them wrong

Calculation is done with this:

the Evolve-Video:

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This is, in fact, the steepest hill in the world. Located in New Zealand. I watched the video. They went up the steepest hill by moving curb to curb near the top of the hill. Thatâ€™s not the same as going in a straight path.

Edit 1: OP has a typo. What do you mean 30-30% hill grade? Baldwin street has a 35% grade.

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Nice info you have compiledâ€¦

Takes a bit of time to understand itâ€¦ but after a while it gets somewhat reasonable I thinkâ€¦

Someone know could take a vesc monitor app and do some field tests with this dataâ€¦

though 3-4kw for reasonable speed and hill climb sounds reasonable.

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yes, this is pure theoretical, verifying this with real data would be great

Good post. You mentioned, â€ś38t Drive-Gear to get max torque.â€ť This is a topic I wish more e-skateboard makers would include and talk about. Where can I find more information and learn about â€śdrive gear ratioâ€ť?

It should be noted a personâ€™s setup to get max torque will be a result of a battery pack, motor, and wheels chosen.

An automotive book about gear ratio and final drive ratio should give you a basic understanding although itâ€™s complex. The important point is taking what you learn about choosing gears for higher Top End or higher Acceleration/Low End Torque.