Search found 3348 matches

by motomech
Nov 13 2019 7:38pm
Forum: Motor Technology
Topic: 2WD (2 Controllers + 1 LCD) Setup - Advice?
Replies: 2
Views: 109

Re: 2WD (2 Controllers + 1 LCD) Setup - Advice?

For a 2WD Bike that is running 2 of the same controllers, can the wires from the LCD be "spliced" into 1 feed? That way to give the pedal assist evenly to each wheel and whatnot? I think not. If you are talking about the "KT" style sine wave controllers, the display is intergral to the operation of...
by motomech
Nov 13 2019 6:57pm
Forum: E-Bike General Discussion
Topic: How to remove a stuck pivot bolt
Replies: 21
Views: 477

Re: How to remove a stuck pivot bolt

Air hammer?
They are cheap at Harbor Freight, but you need a compressor.
by motomech
Nov 12 2019 8:50pm
Forum: E-Bike General Discussion
Topic: Convert 2 Classic MTBs to eBikes
Replies: 3
Views: 192

Re: Convert 2 Classic MTBs to eBikes

I agree with all of the above. In fact, I would say you need a better donor bike to start with. Since you haven't filled out your profile, we don't know where you are, but out West Craigslist usually has plenty of 2003 and up used MXB's to look at. Bikes in these years are new enough to have disc br...
by motomech
Nov 12 2019 8:14pm
Forum: E-Bike Technical
Topic: PAS Issue on Q100C motor
Replies: 4
Views: 104

Re: PAS Issue on Q100C motor

Turn the sensor around 180 degrees. With the supplied bracket, it's possible to line up one of the screws. And like all the PAS systems I've installed, the sensor has to be very close to the disc.
by motomech
Nov 08 2019 9:37pm
Forum: Battery Technology
Topic: Lipo slightly puffy
Replies: 29
Views: 765

Re: Lipo slightly puffy

I'm glad I'm getting replies that basically say not to be too concerned. There are so many horror stories of lipos catching fire, exploding, etc., that when I see mine begin to puff slightly, I think the worst. Not that I'm afraid of burning my house down--as I mentioned before, I keep them stored ...
by motomech
Nov 08 2019 9:24pm
Forum: E-Bike Technical
Topic: Direct Drive Vs Geared Hub at 48V possible replacement
Replies: 31
Views: 712

Re: Direct Drive Vs Geared Hub at 48V possible replacement

Right now I have a 7 Speed freewheel on the hub motor though the gearing is 9 speed. The reason for this is that with such a big motor only a 7 speed would fit. If I get the Q128C would a 9 speed cassette fit? I haven't used the Q128 (I'd like to), but from what I've read, it seems like a Q100 on s...
by motomech
Nov 06 2019 11:16pm
Forum: E-Bike General Discussion
Topic: Upgrade controller and display info.
Replies: 12
Views: 226

Re: Upgrade controller and display info.

Speed is about 19mph using throttle and 24mph when a single grey wire accidentally unplugged. I'm not sure how dis-connecting one wire can boost the top speed 5 mph, but 24 mph is unbelievably fast for a sm. wheel bike on 48 Volts! Those motor spampings are still a mystery of the East, but it does ...
by motomech
Nov 06 2019 7:46pm
Forum: E-Bike General Discussion
Topic: Upgrade controller and display info.
Replies: 12
Views: 226

Re: Upgrade controller and display info.

Leave it alone, the controller and display are the same as every other budget sine wave "Torque Imitation" system out there and they all have 5 levels of PAS. And neither the controller nor display will add to the top speed, that is batt. Volts and you don't want to mess w/ that either. You might in...
by motomech
Nov 06 2019 2:16pm
Forum: E-Bike Technical
Topic: Q100CST and Top Speed
Replies: 35
Views: 883

Re: Q100CST and Top Speed

Thank you for a reasoned and logical explanation. Now I understand why the 17A on my Q100C is fine. However on my DD 1000w a 14 amp controller may be too low perhaps? Its ok as I was thinking of replacing the whole system anyway as I only need occasional trailer pulling. Id much rather trade the 6k...
by motomech
Nov 05 2019 1:42pm
Forum: E-Bike Technical
Topic: Q100CST and Top Speed
Replies: 35
Views: 883

Re: Q100CST and Top Speed

First thing, you can't think about electric motors like they are gas engines, so forget everything you know about ICE's. In very simple terms, the motor, controller and batt. are a system and should be thought of as such. The controller responses to the demand it "sees" from the motor, think electri...
by motomech
Nov 05 2019 12:02am
Forum: E-Bike General Discussion
Topic: Best rear tire for 26" DD hub motor
Replies: 26
Views: 624

Re: Best rear tire for 26" DD hub motor

I still think the Crazy Bob is the best street / light dirt tire in the 24" size, 24" X 2.4" to be exact. Maxxis Hookworm 24 X 2.5" is surely a worthy rival, then. Both of them are good quality, robust tires without any special anti-puncture belts built in. They rely on thickness and strength to do...
by motomech
Nov 04 2019 9:28pm
Forum: E-Bike General Discussion
Topic: Best rear tire for 26" DD hub motor
Replies: 26
Views: 624

Re: Best rear tire for 26" DD hub motor

What about the SuperMoto X with GreenGuard 26 x 2.4 ?: https://www.schwalbetires.com/bike_tires/road_tires/super-moto-x That was going to be my choice over the Big Ben Plus but the SuperMotoX didn't come in 24" I still think the Crazy Bob is the best street / light dirt tire in the 24" size, 24" X ...
by motomech
Nov 04 2019 6:53pm
Forum: E-Bike Technical
Topic: Q100CST and Top Speed
Replies: 35
Views: 883

Re: Q100CST and Top Speed

Motomech is back on the forum. BTW ... Donde diablos esta Punta Cana , Mexico ? Es 25 miles sur de ensenada, baja california I live next to one of the few roads in Latin Amer. that has nice wide shoulders, so hopefuly I won't get mowed down when riding. Weather is like San diego, but a little coole...
by motomech
Nov 03 2019 10:23am
Forum: E-Bike General Discussion
Topic: Small hub motor
Replies: 18
Views: 662

Re: Small hub motor

Regarding front / rear, I am fine with unnatural (at least unless I end up having to accept low level pedal assist after more test riding) because of when I am looking to engage the motor. A frt. mounted mini is not particularly "unnatural" feeling if the system power is low, say below 1000 Watts. ...
by motomech
Nov 03 2019 10:02am
Forum: E-Bike General Discussion
Topic: Small hub motor
Replies: 18
Views: 662

Re: Small hub motor

Coming back, the Q* ones had looked on point, but had seemed.problematic from a quality perspective...am I dismissing them to quickly? Yes you are. Motors, irregardless of make or type are the most reliable component in the system and you are more likely to have a problem w/ the controller, wiring ...
by motomech
Nov 02 2019 11:38pm
Forum: E-Bike Technical
Topic: How to Use a Watt Meter
Replies: 9
Views: 304

Re: How to Use a Watt Meter

On a recent trip I came back and measured the voltage drop. 54.1V to 50.8 Volts at 8.4 miles. It's an eleven amp hour battery. I thought it would tell me how many amp hours I have left. How can I calculate it? You have "range anxiety". I've found it much easier to mount a Voltmeter that can be seen...
by motomech
Nov 02 2019 11:23pm
Forum: E-Bike Technical
Topic: Q100CST and Top Speed
Replies: 35
Views: 883

Re: Q100CST and Top Speed

I had a 201 q 100 cst , in a 700c wheel with 25mm road tire and in the real world ... on flat ground , with no head wind , and with a fully charged 52 volt pack ( 14s ) that was close to 58.8 volts fully charged. I could only get between 20-21 mph and rarely 22 mph if a little down slope. As the ba...
by motomech
Nov 02 2019 10:56pm
Forum: E-Bike General Discussion
Topic: Small hub motor
Replies: 18
Views: 662

Re: Small hub motor

Besides, I think carrying a pack, no matter how small it is, is a little fanatical. I really think for folks that are happy in the low 20's MPH range, don't have any huge hills and want a good workout with a minimum of ebike fuss, the tried and true combo of shark batt., KT sine wave controller and ...
by motomech
Nov 02 2019 10:28pm
Forum: E-Bike General Discussion
Topic: Small hub motor
Replies: 18
Views: 662

Re: Small hub motor

A few of the guys who built lightweight road bikes carry the battery in a backpack with a quick release electrical connection of some kind. They seem to think it is a valid concept. I guess that all depends on the person. My reply, lacking much O.P. rider info, is geared towards the majority that m...
by motomech
Nov 02 2019 1:28pm
Forum: E-Bike General Discussion
Topic: Small hub motor
Replies: 18
Views: 662

Re: Small hub motor

I am looking to augment with a small motor to give it an occasional boost (throttle only), but intend to ride it 99% of the time on pedal only. If this is truely your intent, then forget the electric system and put your money in a better road bike. The idea of pedaling around w/ a motor installed a...
by motomech
Oct 30 2019 4:49pm
Forum: Battery Technology
Topic: Monitoring 13s lipo pack
Replies: 13
Views: 451

Re: Monitoring 13s lipo pack

Storage charge to no more than 3.90V.
Top charge before using.
by motomech
Oct 27 2019 10:43am
Forum: E-Bike Technical
Topic: how to protect hub for winter and salt and water
Replies: 9
Views: 391

Re: how to protect hub for winter and salt and water

One trick we learned here from D8vh is to wear a large rain poncho and drape it over the controller, connections and battery when riding.
by motomech
Oct 27 2019 4:55am
Forum: Battery Technology
Topic: Monitoring 13s lipo pack
Replies: 13
Views: 451

Re: Monitoring 13s lipo pack

What dogman said. Who watches their cells when riding? Watch them when you are charging if you want to get to know them. The only thing you need to know when riding is when to stop and you only need look at whatever tap on the pack you want to use (Just one alarm). You should know if the is any weak...
by motomech
Oct 27 2019 4:30am
Forum: E-Bike Technical
Topic: how to protect hub for winter and salt and water
Replies: 9
Views: 391

Re: how to protect hub for winter and salt and water

Water ingress is going to happen on common hub motors. In reasonable conditions(Water not up to the axel), motor heat can evaporate out a lot of it that didn't drain out. Salt, dirt and other particulates can build up, more than rust, not that much will rust, and probably the best thing to do is to ...
by motomech
Oct 16 2019 8:36pm
Forum: E-Bike Technical
Topic: Completely fried a Bafang 250w motor
Replies: 3
Views: 261

Re: Completely fried a Bafang 250w motor

It's junk. Geared mini motors are not particularly expensive. The easiest way to replace it would be to get another with the same diameter (spoke hole to spoke hole) and swap out the core, meaning the wheel would stay intact. That probably means Bafang (or Bafang clone) and there probably are a coup...