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Gear Ratios For your Electric skate/longboard

electric-skateboard
gearing

#1

So I am making my first electric skateboard and I am wondering what kind of gear ratio I should use. I have an “Outrunner Brushless Motor 6354 Kv200” and 76mm abec11 flywheels.I havent bought any of the electronics yet (if that matters). I plan on running a single motor set up. I only weigh about 115 but I still want my board to be able to carry heavier people (friends). The terrain will be the San Francisco hilly terrain, but I plan on going up milder hills. I want to get the gear ratios into my CAD of my board so I can see how everything fits up. Also, does anyone have a CAD of the 76 mm Abec 11 flywheels? That would be super helpful!
Cheers,
Dominic


#2

Typically, 12T 13T 14T 15T 16T and a 36T pulley is the standard and should be fine.

I ride in SF and if you plan on climbing hills and want a reliable commuter. I would suggest going dual motor for more reliability.

You can find some pulleys on thingiverse.


#3

Calculate


#4

107mm - 44 tooth
97mm - 40 tooth
90mm - 36-37 tooth
83mm - 34 tooth
76mm is too small for eboarding IMO but it can work.

These are calculations based on sane ERPM values below 60k and a 24 to 26 mph top speed paired with commonly used motor pulleys.


#5

Is this erpm calculation correct? ERPM= (voltage)x(kv rating)x(7 pole pairs, for most 50-63mm motors)

If it is hows gearing affecting erpm calculations?


#6

Yes that is a correct. If your erpm is very high and your gear ratio is very low it is possible to overrun the erpm when coasting down a steep hill.


#7

Hey chaka do u have those 107mm flywheels for sale? How much are they? Do u have pulleys for them? Will the fit in a caliber ii fifty 10"?


#8

I had a few sets but I sold them already. I can get more when I restock if you want a set. They are not cheap, $140. Let me know if you want a set. Space is limited on common trucks you want to use a really wide setup with them.


#9

Got to agree on limited truck real estate to fit the 107mm as they are centerset and massive contact patch. Was able to cram them onto caliber 2 with psychotiller mounts and enertions but only 9mm belt and pulleys.


#10

Do you expect you’ll be stocking 83mm versions at some stage?


#11

Yes, we plan on stocking them soon.


#12

U think the will fit on a caliber ii fifty with a single motor and 12mm pulley? Im using tb mount


#13

You might need to file away some of the hanger to get them to fit.


#14

U got pulleys for them?