markz
100 TW
Obviously the 5K MXUS or QS motors would be the "value" choice to make.
dogman dan said:My gut reaction is if your gasser is that good, why go electric? Not for legality, that's for sure.
Or maybe for legal, but that means limiting power to whatever is legal where you are, which is cheap.
Bad ass electric, as you want is never cheap. You will either spend a lot on batteries, or spend it twice. 60 mph will take a strong battery, and 15 miles range at that kind of power level means a decent size of it too. All much heavier in the end, than your gas motor.
You can do a modest, still illegally fast e bike on the cheap. Generic hub motor, 72v 40 amps controller, and 10 ah of RC type batteries.
Motor and controller well under $500, batteries close to $500, and charger can be fairly cheap. 40 mph club e bike. Now its still pretty light, since 72v 10 ah of battery is not that huge, and heavy. It will do the 15 miles at 30 mph, with 40 mph when you need it.
Stopping power goes by the SQUARE of speed. In other words, you need 4x the brake to stop a 60mph bike vs a 30mph bike. (Remember, energy is 1/2 MV^2.)miro13car said:stopping power must be proportional to speed.
dogman dan said:My gut reaction is if your gasser is that good, why go electric? Not for legality, that's for sure.
Or maybe for legal, but that means limiting power to whatever is legal where you are, which is cheap.
Bad ass electric, as you want is never cheap. You will either spend a lot on batteries, or spend it twice. 60 mph will take a strong battery, and 15 miles range at that kind of power level means a decent size of it too. All much heavier in the end, than your gas motor.
You can do a modest, still illegally fast e bike on the cheap. Generic hub motor, 72v 40 amps controller, and 10 ah of RC type batteries.
Motor and controller well under $500, batteries close to $500, and charger can be fairly cheap. 40 mph club e bike. Now its still pretty light, since 72v 10 ah of battery is not that huge, and heavy. It will do the 15 miles at 30 mph, with 40 mph when you need it.
rumme said:I think this is very dangerous and certainly does not give the rest of us ebikers a good name. Laws are already being enacted in certain states, pertaining to ebikers.....IMHO, what he wants to build, only guarantess more and more states will have to create more laws concerning ebikes. NOT GOOD !
If anyone supports this type of recklessness, then you support the future laws that crackdown on the rest of us ebikers. I think you may agree with me.
Totally, a hub motor is direct drive (unless you go with a gear motor which you can't because you need more power) and then laced into what is essentially a giant lever working against it in the form of a rim. For this reason hub motors have to produce huge amounts of torque. An external motor can take advantage of gear reduction to create more torque with less power. That said, I really like the simplicity of hub motors for road machines, and I love having the extra space on the frame for batteries. Part of the reason I went with tiny 10" scooter wheels on the Electrom was to get more torque with less watts on a hub motor.motor you linked to is rated at 3kw. Why is that motor OK to run in mid drive, but a 5kw rated motor is needed for running in the hub? Does it have something to do with being able to gear it correctly, like my gas motor?
MadRhino said:@rumme
Those who are giving ebikes a bad name, are riding stupid and careless; and perceived as a nuisance by other users of the street. It has nothing to do with speed and power. Then, no one can give YOU a bad name, but yourself. :wink:
Well, it does have _something_ to do with speed and power; you are going to be able to be a much more effective nuisance with a 50mph bike than one that can barely get to 20mph. (But yes, both bikes, when ridden by someone careless, can be a problem.)MadRhino said:Those who are giving ebikes a bad name, are riding stupid and careless; and perceived as a nuisance by other users of the street. It has nothing to do with speed and power.
For me, 20 mph is crazy fast on an old beach cruiser. :wink:Raisedeyebrows said:I gotta hand it to anybody who can ride a rigid frame Schwinn cruiser at 50 mph, no thanks, give me full suspension, just looking at those things makes my lower back ache.
My motto-I'll ride anything with brakes...................I better add and good forks too, especially over 30 mph.
Agreed. A lot of people make this mistake - take a cheap Wal-Mart MTB with rim brakes and put a 2KW motor on it. Hey, the bike isn't the important part for going fast, right? It's the motor.MadRhino said:The extra cost of a fast ebike is not only in the battery. Not for a rider who is concerned about proper handling and safety of a powerful bike that he does ride everyday. Performance has a cost in components quality and building requirements. Otherwise, you might find out pretty soon that your 60 Mph bike is a good ride at 30.
billvon said:A lot of people make this mistake - take a cheap Wal-Mart MTB with rim brakes and put a 2KW motor on it.