SCOTT E-Venture

[o00scorpion00o]

My Girlfriend's Dad has a lot of hills and is thinking about getting one of these ?

I'm curious about the batteries but being Bosch I'm sure they will last a long enough time ? anyone know the chemistry ?

The other thing is the 250 watts but being a bb drive it would probably be enough ?

http://www.scott-sports.com/at/en/c.../;jsessionid=4DF1E37376228967D6A8615FFA976491

 

[dogman dan]

BB drive is great, but I'd want more than 250w for steep hills. It's not the equivilant of 250w of power measured at the pedals for a regular cyclist. Lots of losses from the battery to the rubber.

250w of assist in a very low gear will of course be very welcome on hills. A lot depends on if he's already a strong pedaler or not. If not, then he wants more power. With the bb drive, and low enough gearing, he'd just about make it up anything. But at speeds similar to just pedaling, 3 mph, not 20 mph.

The typical mistake many make with through the chain motors, is getting suckered into using too high a gear. Then they kill the motor just like it was a hubmotor. Gotta keep that thing spinning fast, and climb slower than most think. Gas engines can take it, but electrics not.

Not sure which one you are looking at, but I just peeked at the 20, and saw no front derailur. So not THAT low geared for real hills. I'm sure it would tackle 5% with no problems though.

 

[o00scorpion00o]

Thanks fot the reply dogman.

Well the problem this being Europe, you can't legally buy anything more than 250 watts.

I did tell him he'd have to put in a lot more effort than he thinks. If the unlimited power becomes law, I told him to wait until then.

I told him the best way would be to convert his existing bike but he wants it to be as much like a bicycle as possible so hubs are out of the question and everything has to be plug and play and the battery needs to be easy attach, charge etc.

How about modding the controller for around 500 watts ?

 

[Miles]

The 250 Watts EU limit applies to the continuously sustainable output of the motor (so, exclusive of motor losses). Peak output is likely to be around 400 Watts.

 

[dogman dan]

Yeah, a ready to ride bike will be legal. I've seen very fit riders having a great time on such bikes in videos. But they aren't doing it no pedaling with 3000w like I can.

Like I said, 250w is plenty for hills we'd call steep if you just pedaled them, up to 5% will be fine. But if he wants to no pedal it up steeper, it will take more power.

No telling what gets torn up if you hot rod one, but I suspect they could handle 36v 20 amps controllers if not ridden like your freinds borrowed bike.

 

[o00scorpion00o]

He wants to put effort into peddling but wants to take the pain out of it, as miles said its peak is more likely to be around 400.

Maybe he can test one out.

 

[Miles]

It's not the equivilant of 250w of power measured at the pedals for a regular cyclist. Lots of losses from the battery to the rubber.

I was just clarifying this. It is pretty much the equivalent of 250 Watts at the pedals. No regulation I've ever seen is based on input power to the motor..... In practice the EU testing procedure sort of measures power at the wheel, in a roundabout way.....