Search found 5538 matches

by MadRhino
Mar 19 2019 9:00am
Forum: E-Bike General Discussion
Topic: Middrive Chain popping
Replies: 12
Views: 138

Re: Middrive Chain popping

Driving the chain is making some basic tuning and riding habits mandatory. Proper chainline, proper tension, matching chain/gears... and proper shifting for the load/speed.

No magic can save a bad tuning, nor a bad rider. :twisted:
by MadRhino
Mar 18 2019 2:04pm
Forum: E-Bike General Discussion
Topic: hub motors, have you broken your rim/spokes yet
Replies: 7
Views: 136

Re: hub motors, have you broken your rim/spokes yet

Every rider will have his own experience, for every rider has his own riding style, terrain, speed, wheel building skills and requirements.

The bike I ride in mountain trails has its wheels rebuilt every year, sometimes once more during the season after a crash or a square hit.
by MadRhino
Mar 18 2019 9:25am
Forum: E-Bike General Discussion
Topic: Looking for robust 24'' rim
Replies: 46
Views: 1305

Re: Looking for robust 24'' rim

You need to avoid spokes rubbing/bending on the edge of the flange, because that is forcing stress on the J-bend and eventually breaking them. That has to be considered when deciding if you lace them in or out. Some spokes have a longer J-bend, letting you use flange washers. This is making the spok...
by MadRhino
Mar 17 2019 10:31am
Forum: E-Bike General Discussion
Topic: Quality issues with Grinfineon Controllers ?
Replies: 3
Views: 135

Re: Quality issues with Grinfineon Controllers ?

This could happen, but Grin does have the very best after sale service and garantee. If you’d end up with problems because of this, they would have replaced it no question asked. I have had a CA soaked in water in a crash and then frozen hard on the way back home. I didn’t expect a free repair. Yet ...
by MadRhino
Mar 17 2019 10:03am
Forum: E-Bike General Discussion
Topic: Bicycle brakes versus motorcycle
Replies: 8
Views: 210

Re: Bicycle brakes versus motorcycle

There are two factors to consider: weight and speed. Weight can force you to build with motorcycle brakes, but speed doesn’t (not the kind of speed that most of our fast ebikes are doing). Short of 100 mph on a sub 100 lbs bike, the best of bicycle brakes are perfectly suitable and can beat the brak...
by MadRhino
Mar 16 2019 10:12am
Forum: E-Bike General Discussion
Topic: Looking for robust 24'' rim
Replies: 46
Views: 1305

Re: Looking for robust 24'' rim

[quote=hias9 post_id=1451893 time=1552679796 user_id=60030] I am going to drill smaller holes for 13ga spokes tomorrow. ... I have 13ga Sapim spokes and 4mm nipples here (cannot use 5mm nipples with this rim) What do you think? [/quote] Use nipple washers. No need to drill, and washers are making a ...
by MadRhino
Mar 16 2019 10:09am
Forum: E-Bike General Discussion
Topic: Odd thing
Replies: 4
Views: 212

Re: Odd thing

neptronix wrote:
Mar 15 2019 9:15am

... what does a bar represent, exactly? :roll: ).
:lowbatt:
14.5 psi ?
:mrgreen:
by MadRhino
Feb 27 2019 5:53pm
Forum: E-Bike General Discussion
Topic: Weight Distribution on Bikes
Replies: 16
Views: 312

Re: Weight Distribution on Bikes

Well, low mass does make a bike easy to balance with precision, while higher mass does make it quicker to shift weight. Compare Trial motorcycles and racing machines. Trial does require low mass, racing bikes are built with higher COG. The idea is that low mass does require more amplitude from the r...
by MadRhino
Feb 27 2019 5:39pm
Forum: E-Bike General Discussion
Topic: Best controller to use with qs 205?
Replies: 58
Views: 1324

Re: Best controller to use with qs 205?

The QS 205 h50 doesn’t work with square wave controllers and that is a problem for those who are seeking hard acceleration with a controller that is small, simple and cheap. It is supposed to work only with sine wave, but I have one trapezoidal wave controller that is driving the QS very hard and re...
by MadRhino
Feb 24 2019 4:07pm
Forum: E-Bike General Discussion
Topic: Best controller to use with qs 205?
Replies: 58
Views: 1324

Re: Best controller to use with qs 205?

That controller is not worthy of pushing a QS205. It's weak as shit. Hmm, maybe you didn't read the initial post regarding the flat aspect of his ride. The Phaserunner can handle 50 amps and at 72 volts that's quite a bit of power. (3500 watts) I guess the question is, do you want obscene power, or...
by MadRhino
Feb 23 2019 1:51pm
Forum: E-Bike General Discussion
Topic: Lost a new ebike off bike rack last Saturday Feb 16
Replies: 9
Views: 359

Re: Lost a new ebike off bike rack last Saturday Feb 16

Check the scrapyards. It might still be in the windshield of a scrapped small car. :mrgreen:
by MadRhino
Feb 16 2019 4:39pm
Forum: E-Bike General Discussion
Topic: MXUS 3k noname Cover Plates
Replies: 19
Views: 460

Re: MXUS 3k noname Cover Plates

I find 299 euro for that motor is not cheap. Just my opinion. How much does it sell in China?
by MadRhino
Feb 16 2019 4:23pm
Forum: E-Bike General Discussion
Topic: Tire size matter building a mid drive bike ?
Replies: 9
Views: 294

Re: Tire size matter building a mid drive bike ?

Tire size does not matter for the drive, it does matter for the speed, terrain, riding weight and style.
by MadRhino
Feb 07 2019 1:18pm
Forum: E-Bike General Discussion
Topic: VOTE: Coil or Air Spring for Front Fork on Road Bike (MTB)
Replies: 9
Views: 348

Re: VOTE: Coil or Air Spring for Front Fork on Road Bike (MTB)

Spring is cheap and easy to service. Air cartridge has a wide tuning range and long reliable service, but expansive to replace. On the street I prefer the solo air because it is never bottomed or beated on such terrain, and can easily be limited in effective travel. In the mountain trails I like a r...
by MadRhino
Jan 12 2019 3:36am
Forum: E-Bike General Discussion
Topic: Controllers, Torque and heat
Replies: 9
Views: 405

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: 714

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: 714

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: 1980

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: 58
Views: 2175

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: 311

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: 1980

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: 714

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: 1980

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: 58
Views: 2175

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: 58
Views: 2175

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...