alswiseowl

hi there,
i have a couple of questions,for any one who can answer.i would greatly appreciate
i live in a semi hilly area,but quite flat.
i plan on getting either a (48v 20amp 500watt rear wheel drive brushless hub kit)
or a (48v 20amp 1000watt rear wheel drive brushless hub kit)my only question is which one would be more powerful & by how much in mph wise.knowing the pros & cons of the 2 would be great.

secondly.if i placed a 24inch rear hub motor wheel on my mountain bike keeping a 26inch standard bicycle wheel on the front of my bicycle.by doing so would this give me better torque for more hilly areas
or would i be better of just getting a standard 26inch wheel kit..any info would be great

also the kit i will be purchasing is from golden motors.
has anyone delt with g.m before and knows there motors and sevice of the company.if they are good or bad.or if any one recommends any good suppliers,please let me know.
the last thing i want to do,just like any one else.is buy a dodgy product
anyway once again i would appreciate any advice towards my questions
thanks
al
syd,australia

cerewa

48v * 20amp = 960watt

in other words, if the specifications you gave for amps and volts are correct, then both motors will use the same number of watts (power). One possibility is that what you're calling "amps" was really meant to refer to "amp hours" which is a measure of battery capacity (which helps you determine range, but not power).

If you meant to say you were considering the 36v (500w) or 48v (1000w) kit on their website, then the 48v kit is faster by 25% or 30%. The motor is the same, by the way, but it runs faster with higher voltage (assuming you have enough watts (amps*volts) to go that fast).

As far as I know the 36v kit is designed to go about 18-20 miles per hour and the 48v kit is designed to go about 25 mph.

cerewa

Oh, and yes, you can use a 24" rear wheel instead of a 26" wheel, but

your torque will be improved by only 8.3%
your bike's handling will be a little bit strange, especially if your battery is mounted in the back
your top speed will be lower
you won't be able to use a rim brake on the smaller rim

SeizeTech

If you want to build a serious hill climber, then I'd look into a conversion like Karma has. His motor conects to a freeweeling crank, so he can utilize the bicycle's gears to climb hills.

alswiseowl

hi there,
first of all,thank you for your info.
the way you have explained how the power,volts & amp hours works,makes it alot easier to understand.
actually you have already helped me save about $200.00 or so.& i appreciate that.
also,i would of never of thought about the rim brakes problem,with the 24inch wheel idea.
so i will stick with a standard 26inch wheel.
once again thanks for sharing your knowlegde.
alex.

alswiseowl

thanks,
now that ive seen karma's ebike where he uses the bicycles gears makes sense.if only there was a karma close to where i live here in (sydney australia) would be great.
he definatly seems to know what he is doing..

anyway im not exactly shore how much a bicycle's chain & gears can take.how ever
i wonder if running the power thru a bigger chain & sprockets similar to motor bikes size ones
would be more durable..or even possible.as im not that mechanically minded.

well thanks for mentioning
karmas ebike design..
ive put my plans on hold for now,with the hub kit.
hopefully get some advice from karma on how to build one my self would be ideal
once again thanks for the info..
al

wasp

as much as i like karma and his builds it was luc's ideal
check out currie 1000w on google vid or youtube

SeizeTech

there's a website store from Abbotsford BC Canada that sells a conversion kit for a mid mount motor that uses the gears. I book marked it on one of my computers. and will post it for you in the next few days.

Shipping to Australia shouldnt be that bad.

alswiseowl

cool,
thanks.

SeizeTech

Hi, i looked tonight but couldn't find the link. but I'll keep looking.
Regards
Tyler

alswiseowl

thanks for your effort
if you dont mind,check out tncscooters.com
thay have a 450watt 36v gearedmotor plus a mounting plate for the left hand side rearwheel mount.
it looks similar to ezip set up,how to you think this motor would perform on hills at 36v.
but would it work on a normal mountainbike or are these replacement parts and upgrades for the ezip or currie ebikes.
i like karmas set up,similar to cyclones kit.
but im worried about quick wear and tear on the bikes gears.+safety in a case where the chain comes of and locks up some where along the drive train.could be dangerous..what do you think

or if the same senario happened with the ezip type set up,i dont think it would be as dangerous if it happened,,what do you think about these senarios happening with chain drive systems..

anyway once again thank for your effort
alex

SeizeTech

Performance wise, I think my Schwinn with a 24V 450W motor and a fixed gear ratio is NOT suitable for off roading or hill climing. But it would handle many flat, dry, paved or dirt trails.

I dont have any direct experience with a system that is able to use the bicycle's gears. To me, it would make sense that a motor hooked up to a granny gear would handle hills every bit as good as human power. But, alas, I don't have the experience to confirm that.

Hower, there are others that have lots of experience in this matter. Perhaps one will come along and give us some insight. It is definitely an area of great interest for me.

best of wishes to you
Tyler

alswiseowl

hi there
im ordering a 450watt 36v motor + parts from tncscooters..they are cheap+quick to response to emails...its pretty much exact to curries mongoose ebike set up....well this is my first ebike build
so it wont be fancy..(i dont really count my 36v front wheel drive hub motor kit a build).that was
to easy........

ive got a question for you or any one with experience in ebike modifications
i need to know the what to do,& what not to do..in over volting systems
at some time in the future i might want to overvolt the 36v set up to 48v..just to see the
difference between them..
anyway take care tyler & the rest of you from this forum

alex