Search found 7218 matches

by MadRhino
May 13 2021 4:17am
Forum: EBike General Discussion
Topic: When you make bonehead errors when lacing a NuVinci for use with BBSHD
Replies: 7
Views: 138

Re: When you make bonehead errors when lacing a NuVinci for use with BBSHD

I wonder why they drilled the rim 72h. I see no reason for that, other than confusing you into lacing a wrong pattern.
by MadRhino
May 12 2021 10:24pm
Forum: EBike General Discussion
Topic: is torque a good predictor of how easy it will feel to go uphill?
Replies: 5
Views: 250

Re: is torque a good predictor of how easy it will feel to go uphill?

So yeah it's all about torque for hills, and torque comes directly from amps. Well, we are talking about torque at the wheel. Torque can be produced by gearing down too. So lower Amps are required for equal torque, only slower. That is why climbing speed is also related to motor power produced, for...
by MadRhino
May 12 2021 2:46pm
Forum: EBike General Discussion
Topic: Help with choosing the right battery for powerful motor
Replies: 22
Views: 586

Re: Help with choosing the right battery for powerful motor

I would look into used leaf cells or other automotive grade cells that will fit. Sounds like a great idea, I did some research, do you know if the wiring has to be changed or just used leaf battery can be easily connected to sabvoton controller? You’d have to make your own battery with used Leaf ce...
by MadRhino
May 11 2021 4:47pm
Forum: EBike General Discussion
Topic: speed relationship between wheel and bike
Replies: 12
Views: 296

Re: speed relationship between wheel and bike

There can’t be a formula that will be exact. First you bother about meaningless factors like steering angle and camber, because bikes don’t need steering to turn or, if little of it they ever do, it is a slight counter steering that initiate the turn. Bikes need steering to turn, only at very low sp...
by MadRhino
May 11 2021 3:45pm
Forum: EBike General Discussion
Topic: 2 Speed Xiongda hubmotor
Replies: 1698
Views: 228063

Re: 2 Speed Xiongda hubmotor

Available now DT Swiss HX 531 29er 36h at wheelbuilder.com. It is a UST lightweight mtb racing rim. It is very stiff but thin hard alloy 30mm wide, meaning it is very resistant to dent or deform, but it could crack on a hard hit. I believe the Stans no Tube MK3 rim is also available now in 29er 36h....
by MadRhino
May 10 2021 3:08pm
Forum: EBike General Discussion
Topic: 2 Speed Xiongda hubmotor
Replies: 1698
Views: 228063

Re: 2 Speed Xiongda hubmotor

My experience is that tubeless is an advantage only with foam inserts (see Cush Core). And yeah, shop for rims. You don’t want to buy complete wheels, with hubs that you won’t use, spokes that will be the wrong length, and a lacing job that you will have to dismantle. All this can pay for much bette...
by MadRhino
May 10 2021 2:23pm
Forum: EBike General Discussion
Topic: KT controllers, can you configure watts delivered at various levels?
Replies: 7
Views: 227

Re: KT controllers, can you configure watts delivered at various levels?

The 3 speed function on those controllers can’t be programmed for power, only speed limitations. But, riding slower does consume lesser average power. Still, even when set to slower top speed, the motor will pull all the current that a controller can feed when motion resistance is hard enough.
by MadRhino
May 09 2021 5:41pm
Forum: EBike General Discussion
Topic: is torque a good predictor of how easy it will feel to go uphill?
Replies: 5
Views: 250

Re: is torque a good predictor of how easy it will feel to go uphill?

Those BB drives are slow climbers but yes, gear ratio does make them climb easily. Torque does make acceleration, and/or climbing ability of course. Yet it is the total watts that are making the true power, thus a better measure of the speed that a motor can attain up a hill. Low power with proper g...
by MadRhino
May 05 2021 9:37pm
Forum: EBike General Discussion
Topic: E-bike mid-drive motors hardly outperforms hub motors
Replies: 37
Views: 888

Re: E-bike mid-drive motors hardly outperforms hub motors

Well, riders who don’t care about efficiency and beat the crap off their bikes day after day, are much better with hubs because mid drives are making them more time tempering than riding.
by MadRhino
May 05 2021 9:28pm
Forum: EBike General Discussion
Topic: Help me choose the best / right controller ?
Replies: 3
Views: 955

Re: Help me choose the best / right controller ?

4110 mosfets are rated 100v, and I run them with 24s lipo reliably. Yet, the controllers often need some work to make them reliable running high power 24s: Beefing the traces, better capacitors, bigger wires.
by MadRhino
May 05 2021 1:54pm
Forum: EBike General Discussion
Topic: E-bike mid-drive motors hardly outperforms hub motors
Replies: 37
Views: 888

Re: E-bike mid-drive motors hardly outperforms hub motors

Yep. Hubs are simple, efficient, durable, and easy to build. Mid drives are for extreme requiremrnts Extremely low or extremely high power Extremely light weight Extreme terrain So many bike manufacturers are building with BB drives nowadays because of the low power legal limitations and the light-w...
by MadRhino
May 05 2021 12:50am
Forum: EBike General Discussion
Topic: building chopper e-bike
Replies: 7
Views: 236

Re: building chopper e-bike

Choppers are custom work. You can buy a kit, but you still need to build custom wheels, and to choose a controller for the voltage/wattage that you want to feed. Then you need to assemble a battery in the shape to match the frame. I believe that you should start with showing us the frame that you wa...
by MadRhino
May 04 2021 6:41pm
Forum: EBike General Discussion
Topic: Maximum allowable size disc rotor on NuVinci N171 hub?
Replies: 5
Views: 147

Re: Maximum allowable size disc rotor on NuVinci N171 hub?

You don’t need braking power on the rear, so you can use a smaller rotor. But, braking modulation precision is most important on the rear because it is easy to lock the rear wheel. Thus, your best choice would be a smaller rotor and hydro caliper, in order to prevent applying brutal braking kicks to...
by MadRhino
May 04 2021 6:20pm
Forum: EBike General Discussion
Topic: E-bike mid-drive motors hardly outperforms hub motors
Replies: 37
Views: 888

Re: E-bike mid-drive motors hardly outperforms hub motors

I don’t know where your comparison come from, but I assure you that the acceleration of a 250w hub is desperately lame as compared to a 250w BB drive on the low cog. There must be some problem with his simulation, then. It's in the article he links to. We should bear in mind that your kind of bicyc...
by MadRhino
May 04 2021 2:50pm
Forum: EBike General Discussion
Topic: E-bike mid-drive motors hardly outperforms hub motors
Replies: 37
Views: 888

Re: E-bike mid-drive motors hardly outperforms hub motors

I mean, if you are building a low power bike, a mid drive does let you build it much lighter and still give it good torque. Would you consider his "250W" motor to be "low power"? He uses the same motor for both, in the simulation, and the theoretical advantage appears in the res...
by MadRhino
May 04 2021 11:21am
Forum: EBike General Discussion
Topic: E-bike mid-drive motors hardly outperforms hub motors
Replies: 37
Views: 888

Re: E-bike mid-drive motors hardly outperforms hub motors

Mid drives are best at both ends of performance scale, but disadvantaged in the middle. I mean, if you are building a low power bike, a mid drive does let you build it much lighter and still give it good torque. And, if you want to build a motorcycle, only mid drives can give it competitive performa...
by MadRhino
May 03 2021 4:10pm
Forum: EBike General Discussion
Topic: Help with choosing the right battery for powerful motor
Replies: 22
Views: 586

Re: Help with choosing the right battery for powerful motor

Motors are damaged by heat. Yet, it is pretty uncommon to overheat a big DD hub. You need to be unconscious to do that. Now most big hubs are equipped with a temp probe, and many controllers have a temp cut-off setting. Even without any temp protection or monitoring, big hubs need to be abused badly...
by MadRhino
May 01 2021 5:38pm
Forum: EBike General Discussion
Topic: Where can I get the type of xt60 connectors that don't melt (fake/real?)
Replies: 8
Views: 268

Re: Where can I get the type of xt60 connectors that don't melt (fake/real?)

What size of bullet connectors & PP do you use? Those from Hobbyking are genuine, the XT90 that I have purchased at least. But still, I don’t like them. I prefer the big gold bullets to assemble lipo bricks, and big Andersons for power and phase connections. The smallest I ever use are 5.5mm go...
by MadRhino
May 01 2021 1:58pm
Forum: EBike General Discussion
Topic: Advice on Donor bike for rear hub conversion - Downhill Full Susp
Replies: 11
Views: 305

Re: Advice on Donor bike for rear hub conversion - Downhill Full Susp

Another, more expansive solution, is to cut and weld the alu in order to make a mount for through axle dropout plates. This kind: DB86DF90-AE35-4F77-95DC-83CFFE8D9C68.jpeg 637A5B59-5B10-4ED2-9996-F9EC4F7F0148.jpeg With the contours of the frame the OP is using, it looks like the cut and weld would ...
by MadRhino
May 01 2021 11:31am
Forum: EBike General Discussion
Topic: Advice on Donor bike for rear hub conversion - Downhill Full Susp
Replies: 11
Views: 305

Re: Advice on Donor bike for rear hub conversion - Downhill Full Susp

Powerful ebikes require custom dropouts anyway. We couldn’t care less about through axle since we need to cut them, or use them as part of the mount for custom dropout plates. It looks a bit challenging with this frame, as far as easy ways to mount the plates, but if not, it would be nice to see ho...
by MadRhino
Apr 30 2021 11:59pm
Forum: EBike General Discussion
Topic: Where can I get the type of xt60 connectors that don't melt (fake/real?)
Replies: 8
Views: 268

Re: Where can I get the type of xt60 connectors that don't melt (fake/real?)

Those from Hobbyking are genuine, the XT90 that I have purchased at least. But still, I don’t like them. I prefer the big gold bullets to assemble lipo bricks, and big Andersons for power and phase connections.
by MadRhino
Apr 30 2021 10:28pm
Forum: EBike General Discussion
Topic: Advice on Donor bike for rear hub conversion - Downhill Full Susp
Replies: 11
Views: 305

Re: Advice on Donor bike for rear hub conversion - Downhill Full Susp

The thru axle design won't work with a hub motor. Just every bike that I have built in the last 12 years were through axle, all of them built with big DD hub motors fed high power. Through axle is a standard in DH bikes for a long time. Powerful ebikes require custom dropouts anyway. We couldn’t ca...
by MadRhino
Apr 30 2021 7:54am
Forum: EBike General Discussion
Topic: Best place to buy Ebike frame in EU?
Replies: 2
Views: 165

Re: Best place to buy Ebike frame in EU?

Chinese Enduro frame, or other Chinese box frames, are not expansive. Their average price is closer to 400$ than 4k. They are not commonly available in Europe or America because there is no interesting profit to make by stocking them. Some are western made, more expansive of course, and usually bett...
by MadRhino
Apr 30 2021 7:36am
Forum: Vendor Relations Corner
Topic: EM3ev WARNING - Possible exit scam!
Replies: 23
Views: 547

Re: EM3ev - Not what I expected. Help needed.

No matter how reliable that sellers use to be, nobody can be sure that everything is going to be fine when you buy online from a foreign country. When you buy in China, it is normal to receive documentation in Chinese, or none at all. It is common to experience shipping delays and sometimes, transpo...
by MadRhino
Apr 26 2021 7:27pm
Forum: EBike General Discussion
Topic: Just license it as a motorcycle?
Replies: 15
Views: 488

Re: Just license it as a motorcycle?

I believe you’d have a hard time licencing a DIY ebike almost anywhere. It would make it easy if it was built on a moped frame that is licenced already. Anyway, what matters most is how you ride, not the power it has. The police are targeting those who behave illegally.