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by MadRhino
May 17 2019 10:12am
Forum: E-Bike General Discussion
Topic: 12 turn Hub-motor vs Mid-drive for hill climbing ??
Replies: 20
Views: 715

Re: 12 turn Hub-motor vs Mid-drive for hill climbing ??

Geared hubs have gears that are weaker than a typical bicycle chain, so it is better to use a BB drive then, and have the benefit of a gear set that can be shifted.. Big DD hubs are hard to beat, when they are heavy enough to shed the heat, and ridden in their efficiency zone. They make a faster bik...
by MadRhino
May 15 2019 5:44pm
Forum: E-Bike General Discussion
Topic: 12 turn Hub-motor vs Mid-drive for hill climbing ??
Replies: 20
Views: 715

Re: 12 turn Hub-motor vs Mid-drive for hill climbing ??

Theory says mid drives are best, because you can change gears for the task. Yet, practice says hubs last longer and require less maintenance. At both end of power requirements, driving the chain has an advantage: very low power or very high power. In the middle, hubs are winning in all aspects of ma...
by MadRhino
May 14 2019 4:09pm
Forum: E-Bike General Discussion
Topic: Inter-Bike Communication
Replies: 8
Views: 208

Re: Inter-Bike Communication

Does your cell phone plan charge for phone calls between you and your wife? Most carriers in the US include free calling within the same carrier, so... Helmet comm systems are using Bluetooth nowadays. Since every cell phone has Bluetooth, I guess it could be used for this purpose, with the need to...
by MadRhino
May 14 2019 2:12am
Forum: E-Bike General Discussion
Topic: Advice on MXUS Turbo build
Replies: 42
Views: 722

Re: Advice on MXUS Turbo build

Yep. 3mOhm is what to expect for such a cell rated 25C
Its resistance will change with temperature, so it does need to be measured at various temp to have a realistic figure.
by MadRhino
May 13 2019 9:31pm
Forum: E-Bike General Discussion
Topic: Advice on MXUS Turbo build
Replies: 42
Views: 722

Re: Advice on MXUS Turbo build

29.9 mOhm seem too high for any lico prismatic cell. It would be rated 2C continuous with such resistance.

Mine that are rated 25C are ten times lower resistance than that. My 75C are 1.2 mOhm.
by MadRhino
May 12 2019 5:23pm
Forum: E-Bike General Discussion
Topic: Lyen 18FET + MXUS3000 V3 cogging, regen issue, cut off
Replies: 2
Views: 89

Re: Lyen 18FET + MXUS3000 V3 cogging, regen issue, cut off

I would first check all connection, then battery. The ebike tester is not good for that. You need to check, not only that connections have continuity, but also that they are not weak. Battery or BMS could be the cause either, for those controllers are cutting/intermittent when the battery does fail ...
by MadRhino
May 11 2019 8:38pm
Forum: E-Bike General Discussion
Topic: Advice on MXUS Turbo build
Replies: 42
Views: 722

Re: Advice on MXUS Turbo build

People used to be told that round cells are safer, but that was when they were made with safer chemistry. Now that so many round cells are lico chemistry, this is not true anymore. It is quite the opposite, and that is why we have seen so many explosive fires in all sort of toys lately. At the same...
by MadRhino
May 11 2019 5:05pm
Forum: E-Bike General Discussion
Topic: Geared VS Direct Drive: Pros & Cons?
Replies: 18
Views: 532

Re: Geared VS Direct Drive: Pros & Cons?

...There is a reason Zero bikes, Harley, Lighting bikes all have mid drives. Weight is the reason. Driving the chain has a neat advantage at both extremes of the power requirement. Very low power, very light weight bikes. Very high power, very heavy bikes. In the middle, in the power range of big D...
by MadRhino
May 11 2019 2:57pm
Forum: E-Bike General Discussion
Topic: Advice on MXUS Turbo build
Replies: 42
Views: 722

Re: Advice on MXUS Turbo build

Many ebike frames are made with the space to fit a lot of round cells and a BMS, but round cells are not a good solution for high power and most end up using RC lipo after some time. Abusing round cells is calling for failure, or dramatic chain reaction fire. The low C rate of round cells is making ...
by MadRhino
May 10 2019 1:08pm
Forum: E-Bike General Discussion
Topic: Advice on MXUS Turbo build
Replies: 42
Views: 722

Re: Advice on MXUS Turbo build

tolkaNo wrote:
May 10 2019 9:22am
Weird build, everything is way heavy and overkill and expensive for 60kmh

Look at getting leaf 1500w, 24" bicycle rims and 18 fet infineon
True. That is what a conscious builder would do for 60 kmh. Yet, building for serious off road has no limit. I was building 10k$ DH bikes without a motor.
by MadRhino
May 10 2019 8:42am
Forum: E-Bike General Discussion
Topic: Advice on MXUS Turbo build
Replies: 42
Views: 722

Re: Advice on MXUS Turbo build

With the weight of motorcycle wheels an tires, no motor is too big. Most builders are not conscious of the performance penalty of motorcycle wheels on an ebike. Heavy wheels are consuming a lot in acceleration, making for the need of a bigger battery. They also have higher cynetic energy, making for...
by MadRhino
May 10 2019 5:37am
Forum: E-Bike General Discussion
Topic: Advice on MXUS Turbo build
Replies: 42
Views: 722

Re: Advice on MXUS Turbo build

In mountain trails, you need the bike compact. 50 inch wheelbase is the max I would like. I don’t like to build with motorcycle wheels. It is a compromise some have to live with, for reliability when the terrain and conditions are too hard on bicycle wheels, and tires especially. I have no thorns or...
by MadRhino
May 09 2019 8:48pm
Forum: E-Bike General Discussion
Topic: Advice on MXUS Turbo build
Replies: 42
Views: 722

Re: Advice on MXUS Turbo build

To ride the streets with high power, stretch the wheelbase to 51 or 52 inches. That is very compact already for a street bike but still, it will make it possible to use the power in acceleration. If it is too short, you will have to stand and lean over the handlebar to keep the bike from backflippin...
by MadRhino
May 09 2019 6:10pm
Forum: E-Bike General Discussion
Topic: Advice on MXUS Turbo build
Replies: 42
Views: 722

Re: Advice on MXUS Turbo build

At 200nm, a DH bike is a back flipper. :twisted: No game for a newbie rider. I suggest that you make your custom clamping dropouts with integrated brake mount on the left, and chain tensioner mount on the right, so you can make them longer to stretch the wheelbase 2 or 3 inches. That would give the ...
by MadRhino
May 07 2019 7:00pm
Forum: E-Bike General Discussion
Topic: ‘net-neutral load’ electric powered trailer
Replies: 6
Views: 183

Re: ‘net-neutral load’ electric powered trailer

A trailer when loaded can be heavier than the riding weight of the bike it’s hooked on, especially if it is motorized and has some battery capacity. In that situation, I would definitely prefer the power on the bike instead. I don’t like the idea of being hooked to a trailer heavier and more powerfu...
by MadRhino
May 07 2019 6:52pm
Forum: E-Bike General Discussion
Topic: Anyone using a Sabvoton 96V120A controller? SVMC96120
Replies: 11
Views: 228

Re: Anyone using a Sabvoton 96V120A controller? SVMC96120

I’d say the power of the 72200 will get you higher avg speed in adverse conditions: climbing, strong wind, repeated acceleration.. Yet, in ideal conditions the 2s extra with the 96120 will be a little faster. To have true advantage of the 96120, you’d have to run 30s. I don’t believe regular torque ...
by MadRhino
May 07 2019 8:32am
Forum: E-Bike General Discussion
Topic: Anyone using a Sabvoton 96V120A controller? SVMC96120
Replies: 11
Views: 228

Re: Anyone using a Sabvoton 96V120A controller? SVMC96120

The Muxxus 3000 is 135mm? I believed it was 146mm with single freewheel. Anyway, It is not much of a problem. When you feed that kind of power, custom dropouts or torque plates are a must, so you can fit even a 150mm if needed so. The controllers that have a high voltage limitation must be mod at so...
by MadRhino
May 07 2019 5:14am
Forum: E-Bike General Discussion
Topic: Anyone using a Sabvoton 96V120A controller? SVMC96120
Replies: 11
Views: 228

Re: Anyone using a Sabvoton 96V120A controller? SVMC96120

I prefer the 72200, so I would run 22s and use a motor with faster winding. I would work on the mod to run it 24s, for it is the most convenient with lipo bricks that are common 6s.
by MadRhino
May 07 2019 3:29am
Forum: E-Bike General Discussion
Topic: Anyone using a Sabvoton 96V120A controller? SVMC96120
Replies: 11
Views: 228

Re: Anyone using a Sabvoton 96V120A controller? SVMC96120

It has mosfets that could take 100v, but for safety the software is set with 90v high voltage cut off. That is common with many controllers. So it is limited to 22s, unless this high voltage cut off is removed, or tricked. Of course, when we feed the mosfets their very limit, we are making the contr...
by MadRhino
May 06 2019 6:30pm
Forum: E-Bike General Discussion
Topic: Anyone using a Sabvoton 96V120A controller? SVMC96120
Replies: 11
Views: 228

Re: Anyone using a Sabvoton 96V120A controller? SVMC96120

It is the largest, but not the most powerful. The 72200 can feed 450A phase current and can be powered with 22s lipo without any mod. Mosfets rated above 100v are higher resistance, so for max power you are better with a faster motor and running 24s or lower.
by MadRhino
May 05 2019 8:19pm
Forum: E-Bike General Discussion
Topic: Will this controller work with ebike
Replies: 6
Views: 168

Re: Will this controller work with ebike

‘Wheelie easy’ is a matter of geometry. There is a limit to the power you can feed those small geared hubs, before they start stripping gears and damage clutch. Work on the balance of the bike. Buy a laid back seat post, DM stem... shifting your cockpit 2 inches to the rear will make your bike much ...
by MadRhino
May 03 2019 9:33pm
Forum: E-Bike General Discussion
Topic: Offset mount for IS disc caliper
Replies: 15
Views: 300

Re: Offset mount for IS disc caliper

Stretching the frame with one or two washers is a common solution. Using a larger rotor is a good solution to gain some space between the rotor and the motor. It does also make some distance from the IS mount, making it possible to fabricate an offset adapter. It is easier to fit a post mount calipe...
by MadRhino
May 03 2019 5:54pm
Forum: E-Bike General Discussion
Topic: Archer D1X Wireless gear shifter
Replies: 5
Views: 134

Re: Archer D1X Wireless gear shifter

I don’t like wireless remote shifters and suspension adjustment. They don’t work any better, so the only difference is that you have one more thing that can fail. Cable guides are now available glue-on and very solid. That is not considering that an ebike has a complete wiring routed fr to rr normal...
by MadRhino
May 03 2019 2:40pm
Forum: E-Bike General Discussion
Topic: first electric bike build, lots of questions
Replies: 19
Views: 656

Re: first electric bike build, lots of questions

Thomsontouring wrote:
May 03 2019 1:04pm
I wouldn't categorically say that a mid-drive install is more difficult...
BB drives are simple. All plug and play as you say.

Bigger, powerful mid drives are a lot of work for most.
by MadRhino
May 03 2019 4:49am
Forum: E-Bike General Discussion
Topic: Switzerland
Replies: 25
Views: 538

Re: Switzerland

Troubles are coming when you ride like a jerk, and you don’t need much power for that.

If you behave, no one cares how much power that your bike is capable of.