Electric Bikes Conversion Kits EMTBS eRoad/Commuting What's New?

Polaris - DuoDrive ? Not seen this 2 speed crank drive before

KirstinS

KirstinS

Esteemed Pedelecer
Apr 5, 2011
3,224
899
Brighton
Polaris jumps into the electric bike market - Images

Not sure about styling of the hardtail and I appreciate these are 450w so for the US market

Still, I was intruiged by the DuoDrive crank drive and its ability to switch between highspeed and high torque. I'm no engineer but this seemed like a more efficient use of power ? At very least you seem to get the best of both worlds in getting a high speed for flats and high torque on the hills.

Have I just be sold the marketing gumpf ?! Is this revolutionary ? Is is just bolted on chinese junk ? Anyone know anymore about these drives ?
 
E

eddieo

Banned
Jul 7, 2008
5,070
6
Frame a bit OTT for my tastes.....I dont want to stand out and draw attention on London roads.

It does not look like junk and has a throttle so one to watch......fingers crossed. Maybe its the new Kudos crankdrive:p

as for the duo drive, more complexity means more inherent unreliability I think, and possibly more weight. On an S class bike it might work but pointless on a legal one.
 
flecc

flecc

Member
Oct 25, 2006
53,216
30,617
It's probably just electrical mode switching, we've had hub motors with this sort of facility in the past. They are usually very greedy for current in the high torque mode, meaning it must be used sparingly or the range suffers badly. Team Hybrid used to sell one with a warning about it's potential current drain and effect on range. Just using the bike's gears effectively on a crank drive bike is far more efficient.
 
M

muckymits

Esteemed Pedelecer
May 31, 2011
419
2
The frame has a huge gap from the seat post to the back wheel and yet it has a carrier mounted battery, it never looks right in my mind.
 
E

eddieo

Banned
Jul 7, 2008
5,070
6
muckymits said:
The frame has a huge gap from the seat post to the back wheel and yet it has a carrier mounted battery, it never looks right in my mind.
Click to expand...
Thats China for you...clueless;)
 
M

mike killay

Esteemed Pedelecer
Feb 17, 2011
3,012
1,629
From Wiki
Polaris Industries is a manufacturer of snowmobiles, ATV, and neighborhood electric vehicles. Polaris is based in Medina, Minnesota, USA. The company also manufactures motorcycles through its Victory Motorcycles subsidiary and through the Indian Motorcycle subsidiary which it purchased in April 2011.[2] Polaris no longer produces watercraft.
 
G

GaRRy

Esteemed Pedelecer
May 18, 2012
1,019
3
Tamworth
mike killay said:
From Wiki
Polaris Industries is a manufacturer of snowmobiles, ATV, and neighborhood electric vehicles. Polaris is based in Medina, Minnesota, USA. The company also manufactures motorcycles through its Victory Motorcycles subsidiary and through the Indian Motorcycle subsidiary which it purchased in April 2011.[2] Polaris no longer produces watercraft.
Click to expand...
Eddie

PMSL :D:D:D

mind you clueless yanks is probably just as appropriate :rolleyes:.
 
D

Deleted member 4366

Guest
There seems to be a big hub in the bottom bracket that must be more than a torque sensor. You can see it from the right-hand side. Maybe it has two motors: one in the crank and one in the hub - hence the name Duodrive. His explanation was very poor. He only said that the power could be varied from 60w to 450w, which you can do with any motor with a thing called a controller. Somebody's going to have to buy one, and then we'll know whether it's hype or technology.

There was a guy claiming that he had modified Bafang BPMs to a dual power system, but nobody could confirm what he'd done if anything and there was a manufacturer that claimed the same thing for their bikes, which used his motors.
Endless-sphere.com • View topic - EBay seller claims to have hub motor w/Nuvinci type gearing
8FUN HE 700 watt 48 volt CVP geared E Bike Motor (runs 52 volts)
http://www.busettii.com/info.html
In the description, Busetti say, ".....600 watt 52 volt 3 phase HE DC motor running 900 watts in phase 2 and 1400 watts in phase 3. Max. output is 1390 watts at 550 RPM & 27 amps constant with a torque reading of 59 ft.lbs. Auto phase shifting with hill sensor activation for phase 2 & 3 output."
 
Last edited by a moderator:
B

Blew it

Esteemed Pedelecer
Jun 8, 2008
1,472
97
Swindon, Wiltshire
Oops, you're right!...There appears to be a second motor mounted to the rear of the bottom bracket, and driving the pedal shaft. which explains the huge gap between the seat-tube and rear wheel.

Now that makes it a VERY interesting bike.
 
You must log in or register to reply here.

Related Articles

View more

Advertisers

Top Bottom