fastest hub motor for bicycle

[jimmyhackers]

im currently doing 35 to 40 mph on a 9c ebay clone hub motor running at 72volts 20amps.

and i want more speed.... 50 - 60 mph.

so is there a bicycle hub motor out there that will do that kind of speed?

if so, what volts/amps does my battery have to be able to chuck out to run it at that speed?

 

[amberwolf]

You might want to play with the http://ebikes.ca/simulator as it has a number of available motors there, that you can setup with different controllers and batteries, etc., and see what it will take to get the speed you're after without melting the motor..

 

[wesnewell]

24s rc lipo on a mxus 3000 3t with an 80A controller will get you there on a 24 or 26" wheel.

 

[dogman dan]

Yep, 3000w muxus a good choice. 24s lipo should be plenty of volts to go fast as you dare on a bicycle. Match the lipo to the controller. If you want 80 amps, might be worth it to buy better lipo than 20c stuff.

100+ volts, times 80 amps, that's the 8000watt ballpark. But it's far from the max, I saw Doc Bass's drag bike at Interbike. 16000 watts per hub. OMG!

 

[spinningmagnets]

Anything over 30-MPH (48 km/h) will get a measurable benefit from fairings...at 50-MPH (80 km/h), the benefit would be huge. Higher top-speed and lower watt-consumption.

 

[jimmyhackers]

thanks for the replies.

fair point about the "fairings" i do notice about 1 to 2 extra MPH's when i tuck in tight to the bike.

i think for my next frame im going to go even lower and narrower. see if i cant minimise my profile some more.

8000 - 16000w is a bit excessive. 24 cell (96v) and 80 amps seems excessive.......

mines currently aroun 72v x 20amps so some 1440watts..... and i get 40mph

i was hoping for somewhere more like 3000watts making 60mph... is there not a hub that does the 60mph for that kind of wattage....

my battery should be able to give double (40amps) continuous making for the 3000ish watt figure...

 

[John in CR]

My ebike based on a Cannondale SuperV has no fairing, and I've had it over 100mph on flat roads on every occasion that I've held it at WOT for more than about 15 seconds. It will do over 80mph up at 6% grade into a headwind without even being in my best aero tuck. The cargo bike I built in 2008 still does right at 60mph, so that speed is a matter of simplicity. I do suggest low and long for any high speed ebike. The only time I've had a regular upright ebike, I didn't feel as safe at 30mph as I do on my SuperV with a custom extended swingarm at 70-80mph due to the high CG on a short wheelbase of a normal bicycle.

 

[dogman dan]

The modifications you made to your bike sound well worth it to me!

They allow the use of scooter or motorcycle motors, vs bike stuff.

The smart guys running the 3000w muxus, or the cromotor, are not using bike tires and rims. They really are making flyweight motorcycles.

At some point, bike tires become incredibly dangerous. They just aren't made for more than a few miles of 60 mph use.