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by MadRhino
Jan 13 2021 8:41pm
Forum: E-Bike General Discussion
Topic: Sur Ron and Larger Riders
Replies: 11
Views: 198

Re: Sur Ron and Larger Riders

Yep, you can find a 7 ft clown riding a kids BMX. Doesn’t make it a good ride.
by MadRhino
Jan 13 2021 8:36pm
Forum: E-Bike General Discussion
Topic: I need a light enduro frame for next build....
Replies: 23
Views: 751

Re: I need a light enduro frame for next build....

At any place, you are better with bicycle looks and high power, than motorcycle looks and legal power.
by MadRhino
Jan 13 2021 8:16pm
Forum: E-Bike General Discussion
Topic: Sabvoton controller help?
Replies: 13
Views: 150

Re: Sabvoton controller help?

... there is a recent thread where a BMS was advertised as a particular current rating, but it does not shut off even at several times that current. Well, this is comforting me with the decision to avoid using any BMS, and monitor batteries by myself. Still, the power cut-off of a BMS should be obv...
by MadRhino
Jan 13 2021 6:23pm
Forum: E-Bike General Discussion
Topic: Sabvoton controller help?
Replies: 13
Views: 150

Re: Sabvoton controller help?

Of course it is useless to set the controller above battery limits. A controller software breakdown has nothing to do with it though. This is a problem that is usually caused by communication interface, that this controller is known for, occasionally.
by MadRhino
Jan 13 2021 3:16pm
Forum: E-Bike General Discussion
Topic: Sur Ron and Larger Riders
Replies: 11
Views: 198

Re: Sur Ron and Larger Riders

Yep. It is fundamentally a junior bike. Those who are riding them around here are teenagers. I am 5 ft 10 and when I stood by one, I was not even tempted to try it. Most of all it is very slow, by my standards at least. Still, I like the frame and would probably be tempted to buy one to upgrade if i...
by MadRhino
Jan 13 2021 3:09pm
Forum: E-Bike General Discussion
Topic: Sabvoton controller help?
Replies: 13
Views: 150

Re: Sabvoton controller help?

A BMS is safe by definition, because it will cut off power if you ask too much. So you can play with you controller settings without worrying about damaging the battery.
by MadRhino
Jan 13 2021 12:40am
Forum: E-Bike General Discussion
Topic: Sur Ron and Larger Riders
Replies: 11
Views: 198

Re: Sur Ron and Larger Riders

You will not find much feedback from tall riders about the Surron, simply because it is a small bike that tall riders usually avoid. The frame should have been made in 3 sizes, maybe they will in the future, but for now they are offering it small only. I am average size and even though I like the bi...
by MadRhino
Jan 12 2021 6:22pm
Forum: E-Bike General Discussion
Topic: I need a light enduro frame for next build....
Replies: 23
Views: 751

Re: I need a light enduro frame for next build....

In MTB bicycle frames, a light enduro is 8 lbs including hardware, shock and BB. And, it does ride damn good as compared to a box frame.

Image
by MadRhino
Jan 12 2021 5:46am
Forum: E-Bike General Discussion
Topic: Middrive e bike v. car drag race
Replies: 103
Views: 2239

Re: Middrive e bike v. car drag race

Riders sure don’t have the habit of talking to their cell phone or tuning the radio at 60 mph. Then, for someone building on steel frames, thinking that suspension and hydro brakes are fetishism, 60 mph on a bicycle must feel janky. I did it on a 19 lbs road bike, and I was happy that the hill pavem...
by MadRhino
Jan 11 2021 6:57pm
Forum: E-Bike General Discussion
Topic: Middrive e bike v. car drag race
Replies: 103
Views: 2239

Re: Middrive e bike v. car drag race

Only here on ES we are well over a hundred to beat that speed building exclusively with bicycle components. Over a hundred! Holy mackerel! That must be just about everyone there is! I suggest that you have a look at how many members we have on ES. :D Only in my neighborhood we are 3 with fast ebike...
by MadRhino
Jan 11 2021 6:47pm
Forum: E-Bike General Discussion
Topic: Middrive e bike v. car drag race
Replies: 103
Views: 2239

Re: Middrive e bike v. car drag race

@Chalo Braking short is a matter of modulation, and good hydro brakes have the best tunable modulation, operated using one finger. I just don’t like using both hands on a brake lever to slow down my bike before cornering downhill, and I hate a rim brake when the rim is not perfect, wet, or the wheel...
by MadRhino
Jan 11 2021 6:15pm
Forum: E-Bike General Discussion
Topic: Middrive e bike v. car drag race
Replies: 103
Views: 2239

Re: Middrive e bike v. car drag race

Some just can’t figure out what it is to brake a bike from 60 mph in emergency situation. Anyone who needs to worry about braking from 60 MPH, needs to be looking beyond bicycle technology (including apparel.) Come on! I have been riding a bicycle 60 mph long before ebikes. A 60 mph top speed is no...
by MadRhino
Jan 11 2021 1:23pm
Forum: E-Bike General Discussion
Topic: Rear wheel & rim size, what is the best moto rim width to go for? QS205, 25kW
Replies: 19
Views: 463

Re: Rear wheel & rim size, what is the best moto rim width to go for? QS205, 25kW

Yep, 200 kg is definitely too heavy for an ebike, when seeking performance especially. That is something that had been discussed. I don’t like using motorcycle wheels because my bikes are in the 40-45 kg of weight. Yet I can understand that some do, for many reasons. Then I recommend building their ...
by MadRhino
Jan 11 2021 1:05pm
Forum: E-Bike General Discussion
Topic: Middrive e bike v. car drag race
Replies: 103
Views: 2239

Re: Middrive e bike v. car drag race

Hydro brakes are not motorcycle tech anymore, for quite a while. Hydro brakes are designed specifically for various cycling disciplines. I wouldn’t say that every ebike does need them, but for fast ebikes it is a major safety issue. This discussion had been recurrent on ES for over a decade, because...
by MadRhino
Jan 11 2021 12:52pm
Forum: E-Bike General Discussion
Topic: Hub motors with 10mm axles
Replies: 9
Views: 257

Re: Hub motors with 10mm axles

Almost every hub motor on the market are standard 10mm axle flats. Only very few big DD with a bigger axle have larger axle flats. Yet, filing the dropouts to fit a motor axle is not unusual, for frames typically have dropouts that are a tad narrower.
by MadRhino
Jan 11 2021 2:59am
Forum: E-Bike General Discussion
Topic: Long Travel Fork on Short-Travel Frame?
Replies: 14
Views: 665

Re: Long Travel Fork on Short-Travel Frame?

Lifting the rear is commonly done with dropouts positioning. The use of smaller wheels diameter is common and does bring back some of the height to the original frame design. Some frames that I have built are designed with dropout height and shock travel ratio adjustments, many have an excentric BB ...
by MadRhino
Jan 09 2021 12:21pm
Forum: E-Bike General Discussion
Topic: Long Travel Fork on Short-Travel Frame?
Replies: 14
Views: 665

Re: Long Travel Fork on Short-Travel Frame?

Yep, the rear can be lifted to compensate the extra travel of the front. That is especially pertinent when we are going to ride on smaller wheels than those that a frame was designed for. If limiting travel with sag, brake dive can be tempered with if the fork has a gate tuning option or more common...
by MadRhino
Jan 09 2021 12:07pm
Forum: E-Bike General Discussion
Topic: Middrive e bike v. car drag race
Replies: 103
Views: 2239

Re: Middrive e bike v. car drag race

Competition, unlike opinion, will always produce the best engineering. Show me one competitive MTB without hydraulic discs? Or (other than DH) without a dropper? Not talking about those 2 examples but in general: competition does produce the best performance oriented development, but often at the c...
by MadRhino
Jan 09 2021 11:44am
Forum: E-Bike General Discussion
Topic: Middrive e bike v. car drag race
Replies: 103
Views: 2239

Re: Middrive e bike v. car drag race

Unsprung weight approaching sprung weight is a fundamental physics problem -- it cannot be "modded and tuned" to "make good handling". A motorcycle wheels as heavy as ebike motor wheel is not an apt comparison, as such a motorcycle has much greater sprung weight, and even there,...
by MadRhino
Jan 08 2021 4:44am
Forum: E-Bike General Discussion
Topic: Rear wheel & rim size, what is the best moto rim width to go for? QS205, 25kW
Replies: 19
Views: 463

Re: Rear wheel & rim size, what is the best moto rim width to go for? QS205, 25kW

25kw would be run for a very short amount of time... It still over 8X the power rating. How many other things would you do that with? Car? Cordless tool? Coffee machine? "Hi, product support? I ran my new 60W desk lamp at 500W for a very short amount of time, and it failed. Will you replace it...
by MadRhino
Jan 08 2021 4:01am
Forum: E-Bike General Discussion
Topic: Siaecosys/QSMOTOR says QS205 3T limited to 408 phase amps!?
Replies: 10
Views: 350

Re: Siaecosys/QSMOTOR says QS205 3T limited to 408 phase amps!?

When you program the controller, you need to set a phase Amp limit. That is because when voltage supplied to the motor is low, the Amps can get much higher in order to feed the limit that had been set for battery current draw. High Amps are harder to travel through a wire than high volts, meaning th...
by MadRhino
Jan 07 2021 8:22pm
Forum: E-Bike General Discussion
Topic: Rear wheel & rim size, what is the best moto rim width to go for? QS205, 25kW
Replies: 19
Views: 463

Re: Rear wheel & rim size, what is the best moto rim width to go for? QS205, 25kW

Did you mean 2.5 kw, 25000 watts is way above the 3000W rating of the QS205, you could possibly run 2.5 kw on the QS205 with a temperature sensor and a display (cycleanalyst) to monitor the heat. Andrew 2.5 kw is only 2500 watts, which is conservative with a motor that is rated 3000 watts continuou...
by MadRhino
Jan 07 2021 6:20am
Forum: E-Bike General Discussion
Topic: Siaecosys/QSMOTOR says QS205 3T limited to 408 phase amps!?
Replies: 10
Views: 350

Re: Siaecosys/QSMOTOR says QS205 3T limited to 408 phase amps!?

I run from a 24s battery that can feed very high Amps but, I am talking watts. How many watts can be lost between those pulled from the battery and the actual power consumed by the motor is subjected to many factors, but none can be created. My settings are limiting the power from the battery side o...