speedy25

You can have both with the two speed hub. Sorry I forget the brand name but we have discussed it.

-SP

2old

S25; Xiongda, available at Luna Cycles, but I've never tried one so can't comment on their utility or reliability.

Dunbar

You also lose the torque sensor when you go the DIY route. A good torque sensor transforms the riding experience IMO.

powell

" cheaply imported from China"??
it really has cheap geared BAFANG motor - that's for sure.
Tens of cheap China brands use it.
Comparing this to Stromer = no comparison.
Nothing exciting.
As long as you are on flat it is OK , once you enter hill is really weak.

2old

I've been riding around on a $5,000 Stromer ST1 X for the last week; probably it's better than the $1099 Juiced Bikes Cross Current. Big surprise. By the way, I'm typing this on my cheap Chinese computer.

larcal

[QUOTE Now, if you get a big enough motor, and feed a lot of power to it, you can overcome the limitations of lower powered hub motors. Just keep in mind such systems are not street legal.
[/QUOTE]

Hi Dunbar,

Your answer is very helpful, but I am still a little murky about the above part.

Understand your initial answer that way motor is wound is the prime determiner and that torque and speed go in different directions. Normally, end of subject, but then things go south with your musing on hyperfat.

By "lower powered hub motors" do you mean motor that is wound for higher torque? If, as you say these motors are like single speed tranny then wouldn't this be like giving more gas to a car in first gear, I.e, you're not going to go any faster?

Regardless of whether I got that right, it seems to me you are actually saying that the answer to my original query as to whether one can theoretically have both high torque and speed is yes,--- by use of bigger motor and higher power flow. And in fact this is not just theoretical as evidenced by new Hyperfat.

Is it your understanding that the Hyperfat motor is wound for low torque and that it just achieves it's hill and I guess cargo ability by more power flowing to it? If so why couldn't they just control amp flow to keep legal speed but provide plenty amps for hills or heavy cargo when hill itself is enough to keep speed down?

HF already tops at 30mph I think. Just need to cut it back 2 mph.

Hyperfat is very exciting to be sure but personally the 4" wide tires not my first choice. Also only one frame size at the moment.

Want a CC type form that will do a legal 28 mph but climb and haul better then at present. Sorry if being obtuse here but would appreciate any further clarification as to why you think that's unlikely to happen, if you do.

Dunbar

Basically I'm saying that if you double the system power (as is the case of Hyper Fat vs. Cross Current) the bike will climb better. Especially if you hit the hill with momentum like in the Hyper Fat climbing video. It's the combination of slow speed and high current that is a problem for hub motors. If you want to grind up steep hills than hub motors aren't a very good option. You can seek out motors wound more for torque, and they will climb better, but it limits top speed and they still won't work as well as mid drives. For somebody who is commuting and has to deal with a couple of modest hills a hub motor can still work fine. Although on my more modestly powered Cross Current doesn't climb that well when battery is below 50% charge. Ideally you could demo some similarly powered bikes on the type of hills you will be riding on. I could type a book here but a couple of test rides would do far more to convey the advantages and limitations of these different setups.

larcal

[QUOTE=Dunbar;19545143]Basically I'm saying that if you double the system power (as is the case of Hyper Fat vs. Cross Current) the bike will climb better. Especially if you hit the hill with momentum like in the Hyper Fat climbing video. It's the combination of slow speed and high current that is a problem for hub motors. If you want to grind up steep hills than hub motors aren't a very good option. You can seek out motors wound more for torque, and they will climb better, but it limits top speed and they still won't work as well as mid drives. For somebody who is commuting and has to deal with a couple of modest hills a hub motor can still work fine. Although on my more modestly powered Cross Current doesn't climb that well when battery is below 50% charge. Ideally you could demo some similarly powered bikes on the type of hills you will be riding on. I could type a book here but a couple of test rides would do far more to convey the advantages and limitations of these different setups. [QUOTE]


Very instructive video. Got stymied here, then distracted. Unfortunately, while most riding would be paved flats and moderate hills got one problem hill need to do. Only 1/2 mile, maybe 12 degrees, but rock/dirt mix, rutted and couldn't get a running start cause of deep curve at beginning.

Remember reading that mid drives wear out chainring and chain lot faster. maybe even cassette? So feel blocked from that choice. Hundreds of miles from any dealer and even those don't carry juiced.

If anyone knows of a hub motor that is wound for more torque, as Dunbar says, would appreciate any tips on how to find that, either which bikes come that way or getting motor alone.

Liked the juiced bikes for the extra large batteries available and the throttle add on option. Didn't seem like anyone else was offering these back when was researching subject.

If anyone feels motivated to upgrade my literacy in quoting department when just want to Quote part of post I'd appreciate it. I.e, unlike other forums if you simply leave quote words and symbols beginning and end but erase words in between you get above monstrosity. My apologies.

Would love to see that hyperfat start out from a dead stop on a steep grade!