GoldenMotor.com Forum
General Category => Electric Motorcycle Conversion => Topic started by: MickMick on March 10, 2018, 08:37:06 AM
-
What sprocket /tooth ratios are people using? I currently have 11T to 33T on the 10kw motor but having issues with setting off. Getting a klunking/judder until moving.
-
Without knowing the outer diameter of your rear tyre it is difficult to say how high you gearing actually is, but I suspect that your 3:1 ratio is probably a bit too high. I roughly estimate the calculated top speed at maximum motor rpm to be around 120mph, and 10kW is not sufficient power to achieve that sort of speed with the amount of aerodynamic drag your bike will produce.
I would suggest that a 5:1 ratio would be a much better option (55T rear sprocket) as it would give a maximum calculated speed of around 70mph with the added benefit of 66% more torque at the wheel.
Check out this video (https://www.youtube.com/watch?v=o70j1I_WkZU&index=16&list=PLmHss3DBZUin2XgGB3vvhxPkLKW0b_mfk) for some useful information on gear ratios.
Alan
-
Funny you should say that. He 55t sprocket just arrived today for me to try. Lol
-
Update. Got the 55T rear sprocket on with the 11T front and its running a lot better. Reduced top speed not to 55MPH but I am happy with that for the time being.