eBikes

[Rod Smith]

What is motivating you to do this? Fuel cost? Food IS more expensive than electricity. Time saving? Remember to factor in the health benefits of human powered transportation. Dominating the slacker team’s leaderboard? Go for it!

[TwoWheelsDC]

Maybe some day the Copenhagen Wheel will be real…

https://www.superpedestrian.com

[jabberwocky]

I’d look at the radpower ( http://www.radpowerbikes.com ) bikes. They are very reasonably priced for what you get and are geared towards being useful commuters (integrated rack, come with fenders and such).

[jnva]

For conversion kits, take a look at em3ev.com. I’m happy with the stuff I’ve bought from them.

[Dewey]

@rcannon100 148859 wrote:

Any thoughts on conversion kits? If you do a conversion, front tire versus rear tire?

Neither, consider a mid-drive kit to leverage the bike gears to get up hills. Weight distribution is affected by motor and battery placement on the bike frame, bottom bracket mounted motor with a bottle cage or frame-bag mounted battery provide low and central weight distribution. A mid-drive motor can mean you lose the front derailleur how much does this matter or are you OK compensating with a wide range rear cassette and smaller front chain ring combo to narrow the gear range? If you want to keep your front derailleur gears a wheel hub motor will let you, motors are heavy though so if you’re seeking more power you might like to buy the motor, checking that it works with your bike disk or V brakes, and have a custom wheel built with eyeletted rims, 12 gauge stainless steel spokes and brass nipples. Don’t put a front wheel hub motor on aluminum or carbon forks as they can’t take the torque and will break, steel forks work best and add a torque arm (or two) to prevent the axle spinning out. This article is a couple of years old but the pros and cons advice about mid-drive motors hold true and it covers kits for the DIY ebike builder. Changing gears under load with a mid-drive motor will crunch and wear your chain and rear cassette so work arounds include a gear sensor or kill switch you can use like a clutch. This article by a UK writer describes mostly mid-drive motors used by ebike manufacturers that build a frame around the motor. How comfortable are you doing DIY electrical soldering, removing the bottom bracket, etc? I reccomend the excellent 3-part series about how to install a mid-drive kit on this website – in my case I had to teach myself to solder, it’s common in the DIY ebike world for owners to purchase kit from one manufacturer and battery from another which results in motors and batteries with different/incompatible connectors – there are local bike shops in the DC area who will do the conversion for you, however DIY feels great when it works plus you built it yourself so you can troubleshoot when things go wrong. You can use your local bike shop to do some of the harder tasks eg I had my LBS remove the bottom bracket and fit a new rear cassette.

Do you want throttle or pedelec-only control, or both? Cheaper pedelec kits use a pedal cadence sensor which works well enough. You can get a torque sensor that plugs into the Cycle Analyst bike computer, but as that goes in the bottom bracket you have to use a wheel hub kit. How much power do you want/need? Do you want an insurable ebike – your home/auto insurance will not extend liability, and Markel cover only manufactured ebikes or kit adapted bicycles that fall under the CPSC definition <750W peak power, <20mph that eliminates most but not all kits. Remember kit manufacturers only give out nominal power ratings - you need to calculate peak power using the formula battery voltage multiplied by the ampage of the motor controller e.g. for a 250W BBS01 kit peak power is 36V (battery) X 15A (controller amps) = 540 Watts, whereas for a 750W BBS02 kit peak power is 48V X 25A = 1200 Watts. You should preferably decide at the outset in advance of ordering any kit what you need/want because the cost of shipping a lithium battery yourself e.g. in case of return to seller is remarkably expensive if you later change your mind e.g. $80 via Fed-Ex ground hazardous material from Arlington, VA to California. Peruse this trusted vendors list, I’ve had good experiences with several US based vendors on this list.

Familiarise yourself with the byzantine world of ebike law, here’s a comparison of state laws but also consult the regulations’s for VA, DC, MD plus local jurisdiction bylaws e.g. Arlington, DC, etc.

A couple of ebike discussion forums I have found useful are Endless Sphere, and Pedelecs (UK). Ebike journalist Court Rye maintains a reviews website. An industry perspective is provided by Electric Bike Report.

All that said many ebike wheel hub conversion kits are plug and play like this Dillenger front wheel kit, so it’s only as complicated as you want to make it, but I hope this gives an overview if you go down the DIY route. Good luck with your build!

[Author]

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