Recent content by fitek

After a very long hiatus and the acquisition of a Shimano EP8 powered class 1 eMTB, I dusted off my 72v folding ebike and the Makita based battery pack is pretty well spent. It has the Shenzen Sucteam controller that was hot stuff on this forum... a decade or more ago. I used Makitas for the...

Yeh you can get a different wind in a motor. I have two 36v hub motors... one for 20" wheels and one for big 700cc wheels. But I only have 20" ebikes. I never used the one for 700cc wheels in a 700cc wheel, I just wanted something that spun slower in a 20" rim.

All right, thanks dudes. I will harvest the other usable parts (the frame is an incredibly heavy steel monstrosity) and move onto finishing my RC motor driven folding bike :) I see I need to update my sig.

It had drag when I started (with no controller). I tried shorting the phase wires in different combos and then all together. No noticeable difference. It feels almost like there's some indexing. I'm gonna guess there's a mechanical problem. Worth trying to figure out what's up with the...

It's brushless. A short sounds possible-- the stock controller was really pitiful but both of the keywin controllers I threw on it blew FETs on a phase IIRC. I swapped in FETs a couple times but then just shoved it into the back of the garage and forgot about it. Some massive torque out of...

Ok, thanks, I'll throw an ohm meter on the power wires. Been out of ebikes for many years and couldn't think what to test. My DIY orange Makita powered folding bike is still running 11 years later. Keywin 72v. So I haven't had to do much troubleshooting, but I'm moving and this Eton Eco has...

I tried to resurrect an Eton Eco folding ebike I bought off Craigslist a decade ago. Battery is toast but I ran it off a bench supply @24v w/ the original pedal first controller. The bike has a direct drive rear hub motor-- massive copper monster. I tried spinning the wheel by hand and it...

Originally I had wanted to build an RC powered bike that didn't need two stage reduction. I figured I could get close by using go kart sprockets and a small wheel. The first scooter had a very small wheel... Like six inches. The reduction wasn't much but you don't need much with a wheel that...

Yes I'm thinking I should leave this wheel alone. The bike is a Haro Pro 24 in excellent condition https://www.harobikes.com/race/bikes/2015-race/pro-24-2015 Too nice to hack up. I was going to put my RC motor on a Downtube folder (I even had mated a no.35 sprocket to the 8 spd Sturmey Archer...

This looks like a one way solution?

I have a brushless RC motor which I setup for no.25 drive on a scooter, but the first time I took it out, I broke the fork. I also happen to have a no.25 sprocket which I machined onto a 16t freewheel many years ago (I made it not freewheel anymore). I noticed my 24" bmx bike has threads on...

So I don't have time to watch all these videos, but are the components on any of these bikes good? I mean looking at Giant's 2015 offerings, they put 32mm forks on almost everything unless you spend 5k. Adding electric drive means you can abuse the bike a lot harder.

Looking good DoctorBass! I haven't been on the forums in a couple years and was glad to see one of your threads near the top :) What Giant bike did you use? I recently got into AM/freeride and picked up a Trance and Reign (not electrified).

Well, a search of mouser makes it pretty easy. Criteria: type: high AND low side. ( select all options like that in mouser filters) inverting/non-inverting (doesnt really matter. should be consistent if 2 channel to avoid driving self crazy) at least 1a drive current runs off 12v supply (so...

This has all stirred up a bunch of memories from long ago. Need 3 H bridges to drive a 3 phase brushless DC motor. An H-bridge has a high side and a low side. This connects power to the battery (high side) and then to ground (low side). Without getting into technical details, for high power...