Search found 2016 matches

by Voltron
Apr 16 2020 11:01am
Forum: E-Bike Technical
Topic: An Unplanned Motor/Wheel assembly Test Stand
Replies: 10
Views: 966

Re: An Unplanned Motor/Wheel assembly Test Stand

Wait a minute, what's this 'Optical tach?' Looks like a fascinating setup if we learn how it really works. What are you supposing the peak rpm will be under load, don't forget Re the tach, its not set up to give full time reading like to a dashboard... You have to pick up the unit and aim it at the...
by Voltron
Apr 16 2020 10:52am
Forum: E-Bike Technical
Topic: An Unplanned Motor/Wheel assembly Test Stand
Replies: 10
Views: 966

Re: An Unplanned Motor/Wheel assembly Test Stand

Maybe fab up something like this.. It's a 2 motor rim drive friction setup as a ebike conversion,so you could use the motors for load and metering without needing a tire. His flip away from the wheel when turned off, but you wouldn't need anything fancy like that, just some width adjustment. images ...
by Voltron
Apr 15 2020 3:28pm
Forum: E-Bike Technical
Topic: Opening a hub motor - FAQ
Replies: 40
Views: 11272

Re: Opening a hub motor - FAQ

And silicone should be fine for that...
by Voltron
Apr 15 2020 3:26pm
Forum: E-Bike Technical
Topic: Opening a hub motor - FAQ
Replies: 40
Views: 11272

Re: Opening a hub motor - FAQ

Do you have a continuity meter for testing to make sure they're not either broken somewhere besides the obvious cut, or shorting before final reassembly?
by Voltron
Apr 15 2020 3:24pm
Forum: E-Bike Technical
Topic: Opening a hub motor - FAQ
Replies: 40
Views: 11272

Re: Opening a hub motor - FAQ

:thumb:
by Voltron
Apr 15 2020 3:21pm
Forum: E-Bike Technical
Topic: Opening a hub motor - FAQ
Replies: 40
Views: 11272

Re: Opening a hub motor - FAQ

If you cut the zip tie, you can usually pull just enough slack out the axle end to repair them... But some times the repair is too bulky to want to go back in very far. If you pull it in the other way, you have to pull a lot more thru, and same thing with not sliding back out, and then maybe the oth...
by Voltron
Apr 15 2020 3:06pm
Forum: E-Bike Technical
Topic: What am i doing wrong? Help please
Replies: 19
Views: 455

Re: What am i doing wrong? Help please

Have you considered backpack battery? I use one on a couple of my mountain bikes... It's a really noticable difference getting the weight off, and some people don't like the underboard ones on a longboard because of changing the flex during carving. Some of the fancy production ones have integrated ...
by Voltron
Apr 11 2020 3:18pm
Forum: E-Bike Technical
Topic: What am i doing wrong? Help please
Replies: 19
Views: 455

Re: What am i doing wrong? Help please

That is why I wrote theoretically... I almost added "or about 180wh if you go by the nominal voltage." Thanks for stepping up... And pretty quick with the ban hammer... Social distancing getting to you? 🤣
by Voltron
Apr 11 2020 3:08pm
Forum: E-Bike Technical
Topic: Bike modification.
Replies: 9
Views: 327

Re: Bike modification.

Well, we sure have opposite opinions about things Balmorhea! 🤣 I find it to be the exact other way.... in the cities I ride in, being able to go about 30 on the top end is much safer! I've learned to dread test rides on customers 23-ish mph bikes. It seems that drivers really hate to be behind a bik...
by Voltron
Apr 11 2020 2:39pm
Forum: E-Bike Technical
Topic: What am i doing wrong? Help please
Replies: 19
Views: 455

Re: What am i doing wrong? Help please

As for the watts, with your setup, maybe something like one of these from a RC shop.
Screenshot_20200411-123755.png
Screenshot_20200411-123755.png (484.8 KiB) Viewed 220 times
by Voltron
Apr 11 2020 1:54pm
Forum: E-Bike Technical
Topic: What am i doing wrong? Help please
Replies: 19
Views: 455

Re: What am i doing wrong? Help please

That looks badass...

And watt hour calculation is easy.. It's the volts times the amp hours. So at full charge of 42v, times 5ah is theoretically 210 watt hours. When you series the packs up, it's doubling the voltage, but it's still 5ah.
by Voltron
Apr 09 2020 1:04am
Forum: E-Bike Technical
Topic: Xtracycle rear cassette problem
Replies: 6
Views: 178

Re: Xtracycle rear cassette problem

You need to add one or more of these... index.jpg to the axle, until they stick out past the rotating part of the freewheel. You can use something like this.... img528store.jpg if it needs a lot of spacing, but it should have the flat sided hole kind in there first.. Round hole ones sometimes push o...
by Voltron
Apr 08 2020 11:37pm
Forum: E-Bike Technical
Topic: Bike modification.
Replies: 9
Views: 327

Re: Bike modification.

Pictures of the actual connectors help a lot... Sometimes you have to be ready for chopping a few connectors and wiring on ones that match... Or sometimes just swapping everything except the motor and battery... Once you getting it going faster though, you sometimes realize the battery can't handle ...
by Voltron
Apr 08 2020 8:13pm
Forum: E-Bike Technical
Topic: What am i doing wrong? Help please
Replies: 19
Views: 455

Re: What am i doing wrong? Help please

I don't know vesc settings, but I know saggy cells... It wouldn't be unusual to see maybe .4 or .5 sag under high load, esp as it's a pretty small pack. When a pack is the same voltage but more amp hour, it usually has more cells in each group, so they share the load, and don't sag as much. Small ah...
by Voltron
Apr 08 2020 8:01pm
Forum: E-Bike Technical
Topic: Rear wheel 8 to 7 speed
Replies: 24
Views: 441

Re: Rear wheel 8 to 7 speed

And john61ct, yes, if you really want to pedal along, more gears is usually better. But the steps between the gears is important too, depending on how fast you like to accelerate. On one of my hub motor bikes, it has a triple on the front, and 8 rear, but when going thru a series of stop signs in th...
by Voltron
Apr 08 2020 7:45pm
Forum: General Discussion
Topic: Why do 1/2" pedal taps exist?
Replies: 18
Views: 572

Re: Why do 1/2" pedal taps exist?

someone screws up ~2-3 turns of threads and the shop uses a tap to clear that out I've done that, I think it's called "thread chasing" / "chasing the threads"? makes sense... And usually done from the inside end of the pedal hole and chasing it outward as it makes the initial alignment of the tap e...
by Voltron
Apr 08 2020 6:46pm
Forum: E-Bike Technical
Topic: What am i doing wrong? Help please
Replies: 19
Views: 455

Re: What am i doing wrong? Help please

What BVH was saying is the voltage will sag from the load while you're riding to under 3.6v, but then bounce back up to 3.8v as soon as the motor stops.
by Voltron
Apr 08 2020 5:50pm
Forum: E-Bike Technical
Topic: Rear wheel 8 to 7 speed
Replies: 24
Views: 441

Re: Rear wheel 8 to 7 speed

And it's not like I'm the one calling it 6-7-8 speed chain.. That's what the two biggest bike chain manufacturers sell it as...
Shimano-CN-HG50-6-7-8-Speed-Chain-MTB-Bicycle-bike-chain-6s-7s-8s-HG50.jpg
Shimano-CN-HG50-6-7-8-Speed-Chain-MTB-Bicycle-bike-chain-6s-7s-8s-HG50.jpg (69.83 KiB) Viewed 175 times
by Voltron
Apr 08 2020 5:46pm
Forum: E-Bike Technical
Topic: Rear wheel 8 to 7 speed
Replies: 24
Views: 441

Re: Rear wheel 8 to 7 speed

I'm just going from my own experience where it hasn't been a problem.
by Voltron
Apr 08 2020 5:29pm
Forum: General Discussion
Topic: Why do 1/2" pedal taps exist?
Replies: 18
Views: 572

Re: Why do 1/2" pedal taps exist?

They're not common though.
by Voltron
Apr 08 2020 5:28pm
Forum: E-Bike Technical
Topic: Rear wheel 8 to 7 speed
Replies: 24
Views: 441

Re: Rear wheel 8 to 7 speed

It's seems to work fine... Which is why they sell the same chain for 6,7 and 8.
KMC-X893-CHAIN-6-to-8-SPEED.jpg
KMC-X893-CHAIN-6-to-8-SPEED.jpg (30.27 KiB) Viewed 184 times
by Voltron
Apr 08 2020 5:26pm
Forum: General Discussion
Topic: Why do 1/2" pedal taps exist?
Replies: 18
Views: 572

Re: Why do 1/2" pedal taps exist?

Here's one...
post-792-1220000437.jpg
post-792-1220000437.jpg (352.99 KiB) Viewed 397 times
by Voltron
Apr 08 2020 5:02pm
Forum: E-Bike Technical
Topic: Rear wheel 8 to 7 speed
Replies: 24
Views: 441

Re: Rear wheel 8 to 7 speed

Converting a 9 or 10 to 7 or 8 yes, but usually 7 to 8 is just figuring out which gear or click you don't want to use as the chain width and click spacing is the same.
by Voltron
Apr 08 2020 4:57pm
Forum: General Discussion
Topic: Why do 1/2" pedal taps exist?
Replies: 18
Views: 572

Re: Why do 1/2" pedal taps exist?

And unless it's a speciality bmx crank, the only thing that uses 1/2" is one piece crank, so if it didn't look like this, it's almost guaranteed to be 9/16"
opc-chainwheel.jpg
opc-chainwheel.jpg (35.83 KiB) Viewed 406 times
by Voltron
Apr 08 2020 4:52pm
Forum: General Discussion
Topic: Why do 1/2" pedal taps exist?
Replies: 18
Views: 572

Re: Why do 1/2" pedal taps exist?

Usually the only time you use the taps in a shop is when someone had the pedal unscrew, and then rip out the last thread or two. The tap can fix that. But almost no shop will actually want to drill a bigger hole and helicoil a totally messed up pedal hole. It's incredibly hard to get the alignment j...