So, just how big a motor do I need?
04-04-18, 10:27 PM
#1
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So, just how big a motor do I need?
Hi Folks
I'm 5'8" about 210lbs..Don't consider myself fat and in pretty good shape. I'm wondering how big a motor do I need to propel me along and perhaps some single track hills. I'm looking at this bike; 2018 CUBE Access Hybrid Race 500 29 Black Mint. 500watt motor.
I've also been looking at Biktrix Juggernaut which is 1000watt engine. Unfortunately about 6 hours away from where I live so going in for repairs would be a pain. Cube is local..
Up in Calgary.
Any feedback would be greatly appreciated
Cheers
Al
I'm 5'8" about 210lbs..Don't consider myself fat and in pretty good shape. I'm wondering how big a motor do I need to propel me along and perhaps some single track hills. I'm looking at this bike; 2018 CUBE Access Hybrid Race 500 29 Black Mint. 500watt motor.
I've also been looking at Biktrix Juggernaut which is 1000watt engine. Unfortunately about 6 hours away from where I live so going in for repairs would be a pain. Cube is local..
Up in Calgary.
Any feedback would be greatly appreciated
Cheers
Al
04-10-18, 01:37 PM
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Its a good question. A rider in good shape can do about 250 watts. So, putting a 250 watt motor on my bike is rather like riding a tandem with my brother (without his extra weight).
Most people are of the mind - the more the better. 1000 watts seems to be a good target without things getting too complicated or too expensive. That is kind of like a moped with a very very small motor, or kinda like a golf cart (not that I golf). Power = voltage x current. 500 vs 1000 watts is usually more current - which in effect is more torque. To be safe you can get a 1000 watt motor and run it at 500 watts giving you extra capacity when you need it. The benefit of a lower power motor is cost, weight, and of course it encourages you to share the work by pedalling. at 1000 watts and over - many people don't feel the need to pedal at all.
Most people are of the mind - the more the better. 1000 watts seems to be a good target without things getting too complicated or too expensive. That is kind of like a moped with a very very small motor, or kinda like a golf cart (not that I golf). Power = voltage x current. 500 vs 1000 watts is usually more current - which in effect is more torque. To be safe you can get a 1000 watt motor and run it at 500 watts giving you extra capacity when you need it. The benefit of a lower power motor is cost, weight, and of course it encourages you to share the work by pedalling. at 1000 watts and over - many people don't feel the need to pedal at all.
04-11-18, 12:39 AM
#5
Senior Member
Even 250W constant power creates such a massive amount of force that you can jumpstart with it as well as outreaching 90% of the cars the first meters on an traffic light.
The Bosch motors deliver 75 Nm, which can even let you climb 20% elevation with >10kmph.
https://www.bosch-ebike.com/en/produ...?setLanguage=1
The Bosch motors deliver 75 Nm, which can even let you climb 20% elevation with >10kmph.
https://www.bosch-ebike.com/en/produ...?setLanguage=1
04-15-18, 06:56 PM
#6
Cycleway town
30-75 depending on model, but this is easily misinterpreted - that figure is geared, it's at 1:1 ratio which is extremely slow!
Once you gear up the derailleur your wheel torque is slashed to a fraction of that. It's not a figure to compare to a hub motor when hubs are figured at wheel torque.
That said, the Bosch systems are said to be excellent, as far as low power mid drive systems go.
Once you gear up the derailleur your wheel torque is slashed to a fraction of that. It's not a figure to compare to a hub motor when hubs are figured at wheel torque.
That said, the Bosch systems are said to be excellent, as far as low power mid drive systems go.
