Hey guys I’m new here and looking at building myself an electric longboard. I do have a bit of a history with RC cars so I get the basics with the electronics but I’m having a bit of trouble deciding on the gearing I need for the board. I understand that with the motors a lower kv rating means more torque and a higher one means more speed. I’m looking at the Turnigy Aerodrive SK3 245kv on two 3s lipos in series which I think should be pretty good for where I’m riding - no very steep hills, mainly flat but a few gradual or not too steep hills - but I’m not completely sure what ratio I should be looking at for the gearing. I know the size of the wheels on the long board do play a part in the gearing but I don’t have the board yet so I’m not sure how big the wheels are. I’ve been looking at these cheap motor mounting kits on ebay which I know won’t be the best quality but they’re cheap (http://www.ebay.com.au/itm/Pulleys-and-5065-Motor-Mount-Kit-DIY-Electric-Skateboard-Parts-For-72-70MM-Wheel-/322321348553?hash=item4b0bd977c9:g:aHgAAOSwImRYIanj). There are a few different kits you can get with different tooth pulleys for different ratios but I’m not sure which one would be best. So would someone be able to give me some ratios I should be trying to get with different size wheels (i.e what ratio for 60mm, 70mm, 80mm)? Or even what max speed I should get with that battery and that motor on 6s and then I can use the speed calculator on this site to work out my ratio and wheel size?
Thanks heaps -Jacob