Finished building my 25mph Ebike
 

Gas is getting a bit much and decided to make my old mountain bike to an Ebike. After 3 weeks of searching for the cheapest options, I found a setup for $240 shipped on Ebay. I purchased a 500W 48V system and wasn't expecting much for the money. But I was suprised at the speed I got out if it. Setup doesn't come with batteries, as I was going to use either Lipo or A123. For fun I went from 15s to 20s A123 and GPS'ed a speed of 25mph today. Now I just have to buy some more pack and use the bike to commute to work.

http://i189.photobucket.com/albums/z...e/DSC03679.jpg
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http://i189.photobucket.com/albums/z...23Fujibike.jpg

1937W peak. Averaging 5.17A. Next up is 16s Lipo.

Well done. Great idea! If I did not need my truck every day to shuffle my daughter around, I would do something similar. And gas is ridiculous here on Cape Cod..us natives hate the "bridge tax". Go back over the bridge from the Cape and things are a lot cheaper. Gas is 15-20 cents more than on the mainland.

Nice! And please tell me you have some torque arms on that thing! :gasp:

Thanks peeps. My new work schedule allowed me to do this. I don't have to bring the kids to day-care anymore.

About the torque arm. What the hell is that? I've seen them on the forums and whatnot, but do I really need them? My axle has flat spots that slides the wheel in place. No twisting whatsoever. I'm a noobie on this.

If you have steel rear dropouts you might be ok, but as the power goes up the more likely you will spin out your dropouts from the torque. If they are aluminum you really need a torque arm. I would definitely get/make one at the power level you are running at, but you might be ok. Over time you might spin your hub.

http://endless-sphere.com/forums/vie...lit=torque+arm

http://endless-sphere.com/forums/vie...lit=torque+arm

Ah ok man. Thanks! I'll check it as I ride it more.

If you need something fabbed up just let me know, I have SST and mild steel at the shop.

Jeff

Cool beans man. I'll drop by your crib for you to check it out.

Not tonight, I am in San Antonio, I won't be back till Monday night. After looking at the pics of what is needed I am sure I can make some pimp reinforcements.

I maxed out at 28mph with me pedaling like a madman. Without pedaling I got 26mph at one point. So it's not worth pedaling at all when going full throttle. I use the hardcase Acepow lipo's this time. 14S done with three 4s packs and one 2s pack. Not sure if I want to try 16S and risk frying the controller.

I gained some speed today. All I did was switch over to a rear Serfas Drifter City tire. I peaked at 27mph and used 3000mah to get to work. So time wise it is the same getting to work. Only this time I don't use any gas whatsoever.

http://i189.photobucket.com/albums/z...e/IMG_0365.png

Sweet! How much pedaling did you do?

Pondering.
 

So do you take a charger to work with you, or is there enough power left to get you home round trip? Looks pretty good and seems very low profile in nature. The only obvious thing is the battery/ESC bag on the rear rack. I bet a lot of people do not even realize that it is an E-bike when they see you cruising along at 25 mph. Wondering how in the hell are you coasting so fast on level ground.

I have been pondering doing one of these for a while now, but the money is still an issue, because I would have to pull money away from something else in order to accomplish the task. I still need more time. We are about 7 miles from the US Embassy where the wife works, and so will I eventually. It would be nice to be able to drift my way to and from work on my bike without any added daily costs and without killing myself physically. THere are a few up hill stretches to deal with but nothing too demanding. Round trip would be approximately 14 to 15 miles and the traffic here is very light even during what they call rush hour, compared to just about any place we have lived so far. Rush hour in Brussels was just rediculous. It would take about two hours to get home from work by car, and was only about 3.5 miles. I only tried to do it twice and never wanted to do it again. Rush hour in Korea was not much better. I just saw an E-bike in a sports shop here in Prague and the price was in the $1300 range already built and ready to ride with dual disc brakes and a top speed of 25mph. It looks similar to the stealth bike that I saw for like $10K on the internet.

I used 3000mah in 5.5 miles, doing full throttle. The only pedaling done was the 2 seconds moving from the Green light and the first 500 feet from my house. It was cold out today, so I had to warm up a bit. I only stopped a bit to turn on the GPS and let it go for the 1.6 miles as seen in the picture.

I am using my old FMA 6s 10A charger at work. I'm allowed to bring the bike inside my lab, so no risk of anybody stealing the bike. I do use my eagletree logger to see what is going on. Waiting for the LCD screen to arrive, so I can see live data like mah used, voltage, amperage and maybe motor rpm. I could also add my eagletree gps module and see current speed.

Jerry,
the bike rides nice and worth it as long as the weather is good. 1300 bucks for a complete bike is not bad either. My bike when new was near 500 bucks after tax. Add new onroad tires, $240 motor kit and batteries and you come out to the same. Going to work in the morning is a breeze for me, but going home is a pita. Wouldn't be so bad if I drive Toyota, but with the big family SUV it is. I put 75 bucks of gas yesterday and the tank still wasn't full. Gas prices is just killer nowadays. My daily commute time is the same with the bike.

I got looks while cruizing on HP campus. Security didn't know what to think of it.