Search found 5524 matches

by MadRhino
Jan 12 2019 3:36am
Forum: E-Bike General Discussion
Topic: Controllers, Torque and heat
Replies: 9
Views: 325

Re: Controllers, Torque and heat

The controller can’t alter motor physical properties. If you want to produce more torque, you have to feed the motor more watts. A motor has a limit of watts that it can transform into torque, that is saturation point. The windings of a motor has a resistance (impedance) that defines the loss, energ...
by MadRhino
Jan 11 2019 10:56pm
Forum: E-Bike General Discussion
Topic: Banshee Scream downhill MTB conversion
Replies: 27
Views: 568

Re: Banshee Scream downhill MTB conversion

For a powerful bike that will ride 40 mph, a DH fork is not overkill. A Monster T is too much for the street, too big and heavy for the task. Many DH forks are much lighter, and stiff enough for the task. It doesn’t mean that some single crown forks are not able, but you’d need one of the best and p...
by MadRhino
Jan 11 2019 5:00pm
Forum: E-Bike General Discussion
Topic: Banshee Scream downhill MTB conversion
Replies: 27
Views: 568

Re: Banshee Scream downhill MTB conversion

With a heavy hub motor on a bicycle frame , I would have some custom made torque arms for each side, long enough to go far up the chain stays so as to lessen the torque loads on a bicycle's small , thin, drop outs. The droputs of the Banshee Sream are huge and half inch thick. Tight fit torque plat...
by MadRhino
Jan 11 2019 4:40pm
Forum: E-Bike General Discussion
Topic: 40-50 mph 75 mile range
Replies: 52
Views: 1448

Re: 40-50 mph 75 mile range

Many are coming with no clue about what can or can’t be done. We are not here to judge their motivations, only to tell them the facts and help those who are willing to find some realistic compromise.
by MadRhino
Jan 10 2019 2:37pm
Forum: E-Bike General Discussion
Topic: Building a Powerful Ebike
Replies: 52
Views: 1354

Re: Building a Powerful Ebike

First, dead weight added to the bike doesn’t need to be 100 lbs. I do it with 50 lbs max, even less with short range lipo pack. Agreed - but if the goal is "a powerful ebike" you're going to be tending towards heavier batteries. (And he said he wants a large battery.) Second, many DH riders are 200...
by MadRhino
Jan 10 2019 8:35am
Forum: E-Bike General Discussion
Topic: Statorade vs generic Ferrofluid?
Replies: 6
Views: 241

Re: Statorade vs generic Ferrofluid?

Ferrofluids are not all the same. Many factors are affecting ferrofluid performance: weight, density... quantity, type and size of magnetic metal particles. You can make your own pretty cheap. Receipts are simple. Test and class their magnetic and fluidity properties, then compare their heat dissipa...
by MadRhino
Jan 10 2019 2:57am
Forum: E-Bike General Discussion
Topic: 40-50 mph 75 mile range
Replies: 52
Views: 1448

Re: 40-50 mph 75 mile range

30p is horrible battery configuration IMO.

I would consider big prismatic cells a must, for a long range bike.
by MadRhino
Jan 10 2019 2:36am
Forum: E-Bike General Discussion
Topic: Banshee Scream downhill MTB conversion
Replies: 27
Views: 568

Re: Banshee Scream downhill MTB conversion

I suggest this one: QS205 50H v3 It is a big hub, about 28lbs 150mm wide It is available in a large variety of windings, to match wheel size/voltage to your desired top speed http://www.cnqsmotor.com/en/article_read/QS205%20V3%20QS%20Motor%20205%2050H%20V3%20Motor%203000W%20Electric%20High%20Power%2...
by MadRhino
Jan 09 2019 8:43pm
Forum: E-Bike General Discussion
Topic: 40-50 mph 75 mile range
Replies: 52
Views: 1448

Re: 40-50 mph 75 mile range

75 miles range at 50 mph does require too much batteries to fit on a bicycle and make a good ride, except if you do it non stop. Every stop and start, acceleration to 50 Mph, does consume a lot.
by MadRhino
Jan 09 2019 8:24pm
Forum: E-Bike General Discussion
Topic: Building a Powerful Ebike
Replies: 52
Views: 1354

Re: Building a Powerful Ebike

Good DH frames are made to ride that speed, down wild mountain trails. Absolutely - with a live load (a ~180lb rider using his legs as part of his suspension) they do very well. Taking those impacts with ~100lbs of dead weight affixed rigidly to the frame (i.e. a battery, controller, motor) is a wh...
by MadRhino
Jan 09 2019 7:39am
Forum: E-Bike General Discussion
Topic: Building a Powerful Ebike
Replies: 52
Views: 1354

Re: Building a Powerful Ebike

Whatever you do, get the thickest spokes you can, or use moped wheels. BC eventually at some point you'll rip the spokes out of the rim.. Cheers. Thin spokes and rim washers are doing much better. Big spokes need heavy rims, heavy rims need heavy tires, heavy wheels need heavy suspension, heavy bik...
by MadRhino
Jan 09 2019 4:11am
Forum: E-Bike General Discussion
Topic: Banshee Scream downhill MTB conversion
Replies: 27
Views: 568

Re: Banshee Scream downhill MTB conversion

Front hub definitely won't work, rear hub is questionable if you care about off road performance. A mid drive would be best. Realistically $1000 won't cut it unless you get creative/lucky. Fair point. I have looked at the Bafang BBSHD. Do you think that would be compatible? BB is ISIS 118mm fully s...
by MadRhino
Jan 09 2019 3:15am
Forum: E-Bike General Discussion
Topic: Building a Powerful Ebike
Replies: 52
Views: 1354

Re: Building a Powerful Ebike

Good DH frames are made to ride that speed, down wild mountain trails. Don’t worry, the bike is capable. The rider is the only concern. Those are short events. And racers who reach such speeds don't keep running the same bike season after season. Maybe the bikes can tolerate routine motorcycle-like...
by MadRhino
Jan 09 2019 1:32am
Forum: E-Bike General Discussion
Topic: Banshee Scream downhill MTB conversion
Replies: 27
Views: 568

Re: Banshee Scream downhill MTB conversion

Climbing off road with a front motor is not a good idea, especially when it is steep. When you climb, traction is on the rear. Also, mountain trails require a properly tuned suspension, that is impossible to achieve with a motor in the fork. Front motors are suitable (not ideal but suitable) for low...
by MadRhino
Jan 09 2019 12:05am
Forum: E-Bike General Discussion
Topic: Banshee Scream downhill MTB conversion
Replies: 27
Views: 568

Re: Banshee Scream downhill MTB conversion

Liquidbarrel wrote:
Jan 08 2019 10:39pm

Front hub back hub?
Rear hub of course. Ideally a big hub, low Kv.
by MadRhino
Jan 08 2019 10:13pm
Forum: E-Bike General Discussion
Topic: Wink Bar, the connected handlebar
Replies: 3
Views: 205

Re: Wink Bar, the connected handlebar

The integrated GPS tracker is a plus, the signal lights too. For a head light, well I guess they are more like running lights made to be seen, not to see. You’d still need a proper headlight IMO.
by MadRhino
Jan 08 2019 10:07pm
Forum: E-Bike General Discussion
Topic: Torque Arm Derailleur Mount
Replies: 13
Views: 285

Re: Torque Arm Derailleur Mount

That is what I am probably going to do. I think one hole should be okay. Better be a strong bolt (high shear strength), since it'll be the only thing containing the torque of a 16kW motor. Maybe a grade 8? One hole could let it move back and forth with torque/regen hits. I always use two, sometimes...
by MadRhino
Jan 08 2019 9:59pm
Forum: E-Bike General Discussion
Topic: Banshee Scream downhill MTB conversion
Replies: 27
Views: 568

Re: Banshee Scream downhill MTB conversion

The bike has too much of a fork for the speed that you plan. Sell that Monster T and replace with a lighter fork. It does look mint, you can have a good price, for this particular late model of the Monster T is very interesting for those building fast bikes. The bike is good to build, hub or BB driv...
by MadRhino
Jan 08 2019 9:47pm
Forum: E-Bike General Discussion
Topic: Soma Sandworm fatbike discontinued
Replies: 5
Views: 202

Re: Soma Sandworm fatbike discontinued

...Its really just a matter of buying a fat fork, which I keep my eyes peeled for, but I've made a decision to weld up my own from an old suspension fork... An old Monster T dh fork, and most inverted dh forks like Shiver dc, Dorado and such, would let you fit a 4 inch fatbike tire without any mod....
by MadRhino
Jan 08 2019 9:37pm
Forum: E-Bike General Discussion
Topic: Building a Powerful Ebike
Replies: 52
Views: 1354

Re: Building a Powerful Ebike

Dude, just dont go 65mph on a fuckking bicycle man, just dont. Just because others do it, dont follow suit. Bicycles are not meant for that kind of fibration or stress. Might as well just buy a motorcycle frame and put some fake pedals on it. I doubt even them motorcycle looking ebike frames are ca...
by MadRhino
Jan 08 2019 11:24am
Forum: E-Bike General Discussion
Topic: Torque Arm Derailleur Mount
Replies: 13
Views: 285

Re: Torque Arm Derailleur Mount

You have enough surface around the dropout to drill and tap 2 screws to add a custom torque plate. Make one each side using 1/4 thick steel plate to cover the actual dropout plates, with the dropout slot longer for extra safety.
by MadRhino
Jan 08 2019 1:09am
Forum: E-Bike General Discussion
Topic: Lines erased E-Bike / E-Scooter / E Motorcycle
Replies: 247
Views: 6728

Re: Lines erased E-Bike / E-Scooter / E Motorcycle

Good regulation is a part of reducing ALL the risks to everyone You are a candid dreamer. :D There are no regulations that can make idiots and distracted drivers any better. As a rider on the street, we are potential victims of every driver who is not alert and careful. Our only safety is to develo...
by MadRhino
Jan 08 2019 12:39am
Forum: E-Bike General Discussion
Topic: Video of ebike collision - be safe out there!
Replies: 23
Views: 685

Re: Video of ebike collision - be safe out there!

(drift left before turning right) ... It always kills me when I see some Corrola or Civc driver do this... Lots of them are cornering their small cars like it is 40ft long. The worst here in the city that has insufficient parking, are those doing U turns. They know it is illegal, so they don’t sign...
by MadRhino
Jan 07 2019 11:47pm
Forum: E-Bike General Discussion
Topic: Soma Sandworm fatbike discontinued
Replies: 5
Views: 202

Re: Soma Sandworm fatbike discontinued

A do it all bike is not practical. My first 2 builds were meant for do it all, mountain sport and city commuting. They proved deficient on both terrain. Since then I build them specific and use 2 bikes. I use DH frames for both, only building and tuning them very different (geometry, wheels, suspens...
by MadRhino
Jan 07 2019 10:05pm
Forum: E-Bike General Discussion
Topic: Soma Sandworm fatbike discontinued
Replies: 5
Views: 202

Re: Soma Sandworm fatbike discontinued

Fatbike hype is over. They will keep selling, but many manufacturers will stop making them because they can't sell enough. In a few years there won't be middle market for them anymore. Major manufacturers will offer expansive models, and the Chinese crap will feed the cheap market.