Search found 7729 matches

by Chalo
May 08 2021 11:43am
Forum: EBike Technical
Topic: Does a TSDZ2 fit on a Surly Ogre?
Replies: 3
Views: 92

Re: Does a TSDZ2 fit on a Surly Ogre?

Surly bikes are top notch, no problem there. TSDZ2 uses a smaller diameter bottom bracket spindle than anyone else in the bicycle industry, makes it from low strength material, and includes a snap ring groove at the point of highest stress. Compared to that design blunder, their electronics and soft...
by Chalo
May 08 2021 11:38am
Forum: EBike Technical
Topic: Brake lever replacement
Replies: 3
Views: 129

Re: Brake lever replacement

stanleyrbennett wrote:
May 08 2021 11:14am
The motor cut-off cable is my question. I will just cut and splice those wires. Does polarity matter?
No, it's only a switch. Whether the switch is normally open or normally closed does matter, though. Most are normally open.
by Chalo
May 08 2021 10:43am
Forum: EScooters/EMotorcycles
Topic: Build
Replies: 26
Views: 622

Re: Build

Exactly, now why is the rear brake on the foot on gas bikes? Is it because the cockpit is full with clutch and front brake? Why aren't the clutch and front brakes on the feet? Both those things take more finesse and coordination than you have in your feet. When I rode a motorcycle for daily transpo...
by Chalo
May 08 2021 10:25am
Forum: EBike Technical
Topic: Does a TSDZ2 fit on a Surly Ogre?
Replies: 3
Views: 92

Re: Does a TSDZ2 fit on a Surly Ogre?

Those things break, you know.
by Chalo
May 08 2021 10:13am
Forum: EBike Troubleshooting
Topic: Dual hub motor issue
Replies: 2
Views: 81

Re: Dual hub motor issue

Use one throttle. Split the signal and ground wires and connect to both controllers, but use the +5V wire from only one controller.

Are you using a second battery for your second motor?
by Chalo
May 08 2021 10:08am
Forum: Items Wanted
Topic: Looking bob crazy tires
Replies: 1
Views: 71

Re: Looking bob crazy tires

mark 324 wrote:
May 08 2021 9:26am
Hi any know maybe where I can get bob crazy tires?or site where to buy?thanks
Schwalbe Crazy Bob? What size are you looking for? They make a bunch of them.
by Chalo
May 08 2021 10:07am
Forum: EBike General Discussion
Topic: 2 Speed Xiongda hubmotor
Replies: 1698
Views: 228063

Re: 2 Speed Xiongda hubmotor

What are the odds that the Xiongda 2-speed is really intended for use with normal wheels, like 26" to 700C/29" ? It's a parameter I have wondered about - manufacturers are usually silent on the subject of the internal gear ratio, am I right? Reduction gear ratios are usually 1:5 or close ...
by Chalo
May 07 2021 10:21pm
Forum: EBike General Discussion
Topic: 2 Speed Xiongda hubmotor
Replies: 1698
Views: 228063

Re: 2 Speed Xiongda hubmotor

A lightweight, low power hub motor is not a good match for 29 inch wheels. hi why is that ? plz insert what your opinion is based on tx Lightweight means small diameter. Low power and small diameter means low torque. Low torque in a large wheel means low thrust and low rpm. Low rpm means low motor ...
by Chalo
May 07 2021 1:52pm
Forum: EBike General Discussion
Topic: DIY candidates
Replies: 11
Views: 290

Re: DIY candidates

Aside from what Chalo said, where would you mount a battery on those bikes? Under the downtube? There's a limited amount of space there, or in a handlebar bag. You could mount a conventional rear rack on the red bike. The green bike can only have a seatpost rack (which doesn't support much weight) ...
by Chalo
May 07 2021 12:38pm
Forum: EBike General Discussion
Topic: DIY candidates
Replies: 11
Views: 290

Re: DIY candidates

Spend more time researching and getting your expectations better aligned with reality. 20 mph is plenty fast for a regular bicycle. 30 mph is a risky and uncomfortable speed for a regular bicycle, and to go faster you should start with a motorbike or a sophisticated and very expensive fully suspende...
by Chalo
May 07 2021 11:44am
Forum: EBike General Discussion
Topic: 2 Speed Xiongda hubmotor
Replies: 1698
Views: 228063

Re: 2 Speed Xiongda hubmotor

A lightweight, low power hub motor is not a good match for 29 inch wheels.
by Chalo
May 07 2021 10:24am
Forum: EBike Build Threads
Topic: Xtracycle Build Log
Replies: 67
Views: 5819

Re: Xtracycle Build Log

30% difference in efficiency between your two bikes probably indicates one of two things: either a major difference in aerodynamic qualities (mainly riding position), or a difference in average speed. I'm not entirely sure it's aero, as I tuck when I go over 25 on both vehicles. Note that moving th...
by Chalo
May 07 2021 10:19am
Forum: Motor Technology
Topic: Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?
Replies: 109
Views: 3342

Re: Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?

Once you succeed at making e-bikes leaky and smelly, you can move on to figuring out how to make them emit toxic fumes and obnoxious noise.
by Chalo
May 07 2021 10:08am
Forum: Battery Technology
Topic: Nickel welding strips - current capability ??
Replies: 17
Views: 7135

Re: Nickel welding strips - current capability ??

My total length is 30" of nickel per layer. There is never less than 2 nickel sections per group of 5 cells. I did the math based on 100 amps draw and across both layers of 20S5P. I will see 19.8 watts of heat in the nickel. That's hardly worth mentioning really. The nickel strip is one thing;...
by Chalo
May 07 2021 9:50am
Forum: EBike Build Threads
Topic: Xtracycle Build Log
Replies: 67
Views: 5819

Re: Xtracycle Build Log

I notice significantly higher spinning resistance (push wheel with a finger and see how long it takes to stop) than my RBF Cruiser as well... what causes might this point to? Too-tight axle bearings, or a dragging brake pad. In neither case would it make a difference in Wh/mi efficiency, but in bot...
by Chalo
May 06 2021 2:54pm
Forum: Battery Technology
Topic: Ebike Battery stored for a long time
Replies: 23
Views: 652

Re: Ebike Battery stored for a long tome

I can't help but ask about these revival methods I've seen on YouTube where folks open them, fill the cells with distilled water, and then trickle charge them with constant current/low amperage chargers. Does that actually work? I've never tried it. Most bike SLAs are absorbed glass mat type cells,...
by Chalo
May 06 2021 1:31pm
Forum: EBike Technical
Topic: Do some motors have more/less torque with the same power levels?
Replies: 36
Views: 861

Re: Do some motors have more/less torque with the same power levels?

RTLSHIP wrote:
May 04 2021 12:33pm
A smaller wheel diameter should give you more torque
No. Torque is independent of wheel diameter. What you're talking about is mechanical advantage, tractive effort, "thrust"-- but definitely not torque.
by Chalo
May 06 2021 1:26pm
Forum: E-Vehicles General Discussion
Topic: Circumference and speed ?
Replies: 5
Views: 140

Re: Circumference and speed ?

Convert the tire circumference difference into a percentage, and that percentage will also be the change in speed, with RPM's being the same. A smaller diameter wheel will usually be able to spin up to a higher percentage of its free speed. So the difference in top speed is likely to be a little bi...
by Chalo
May 06 2021 1:04pm
Forum: EBike Troubleshooting
Topic: My hubmotor studders when starting.
Replies: 3
Views: 130

Re: My hubmotor studders when starting.

If your motor plugs into the controller with 8 wires (3 large, 5 small), then chances are you have a broken or iffy connection on one of the small wires. You paid your money and you took your chances. Certainly you weren't spending enough to get anything but bottom shelf goods (which might turn out ...
by Chalo
May 06 2021 12:46pm
Forum: EScooter/EMotorcycle Build Threads
Topic: Left drive freewheel sprocket
Replies: 1
Views: 104

Re: Left drive freewheel sprocket

Is there a UK supplier which sells a left drive freewheel 16T or 18T sprocket for either #410 or #420 chain, to fit a motor (MY1018) with shaft size 11mm. Information about an overseas supplier would also be welcome. Ken Get a regular left hand threaded freewheel and mount it on a 1.37" x 24 t...
by Chalo
May 06 2021 11:54am
Forum: Battery Technology
Topic: Ebike Battery stored for a long time
Replies: 23
Views: 652

Re: Ebike Battery stored for a long tome

I don't want to commandeer the thread but I have a similar situation and a similar question. I also bought an ebike from someone who claims it had not been used for years, but the difference between the OP's situation and mine is, the 24 volt battery is compromised of two 12 volt 10amh SLA batterie...
by Chalo
May 05 2021 7:34pm
Forum: EScooters/EMotorcycles
Topic: special pleading
Replies: 70
Views: 1942

Re: special pleading

Electrical regenerative braking is the wrong kind of braking for mobility scooters and powerchairs. The most important braking for those machines is for getting a hard, precisely located full stop, and firm positioning to keep the scooter from moving when it's stopped or parked. E-braking is bad at ...
by Chalo
May 05 2021 11:27am
Forum: EBike Troubleshooting
Topic: Wilderness energy motor has additional drag.
Replies: 3
Views: 106

Re: Wilderness energy motor has additional drag.

Any suggestions on bearing? The bearings usually come out from the inside of the hub side covers. If there's a lot of rust, you might have an adventure getting the side covers off. The seals of the bearings will say what size they are, e.g. "6904" or "6002". Go to VXB or The Big...
by Chalo
May 05 2021 10:28am
Forum: Bike Mechanical & Structural
Topic: Welding down a torque arm
Replies: 42
Views: 787

Re: Welding down a torque arm

-Regen adds range, it's like getting 5% or more of free battery. Using 5% or more additional battery is cheaper and easier for most folks than making and installing clamping dropouts. It's much less likely to end your ride, your bike, and/or your face than using regen braking without clamping dropo...
by Chalo
May 05 2021 10:22am
Forum: Bike Mechanical & Structural
Topic: Welding down a torque arm
Replies: 42
Views: 787

Re: Welding down a torque arm

The forks are strong. They are Chromoly. The tips are solid 5 mm or 1/4" as you can see. No squashed tips. Well, either they're smashed into shape from the tube ends (like an old Huffy), or they're styled to look as if they were. I have never seen a chromoly fork with that treatment, but in pr...