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  1. W

    math problem involving gear inches: help?

    I need some help doing some mathematical calculations for my delta trike (20 inch drive wheel). It has a complex drivetrain, so calculating the gearing is not very straightforward: it has front chainrings and 2 intermediary sprockets between the chainrings and the sprocket on the rear wheel, one...
  2. W

    Recommendations wanted: mid-drive ca. 250w kit w/torque sensing

    Hi. I've got a friend who will be setting up an electric assist bike for his college-age grandson for around-town commuting. He bought the bike already. It's a bike sold by REI, the Electra Townie. What he's interested in is a fairly low-power (say, 250 watt) mid drive kit with torque sensing...
  3. W

    BMS shutoff or battery top-up/partial drain for storage?

    I'm grappling with the issue of battery storage--think over the cold, upper-midwest winter, where biking outdoors is at best unpleasant, at worst impossible: during these intervals, the battery must sit largely unused and thus in storage. My LiFePO4 battery might have to sit idle for 3 months...
  4. W

    Triple chainrings: a flawed concept/design?

    Triple chainrings are, as we know, found on all kinds of bikes, including electrified bikes like mine. But the topic I wish to broach applies equally, I think, to both categories. And it actually arises out of my biking experiences prior to doing my electrification projects. My enagement with...
  5. W

    Test cell V's in Ping LiFePO battery w/out dissecting it?

    I got a 36V 20Ah Ping LiFePO battery 3 or 4 years ago and it's been working pretty well. I actually had to take the bike out of service last year due to a maintenance issue. Well, it took me a whole year to get that maintenance issue addressed and I'm using the battery again this year. I should...
  6. W

    Your thoughts on (bicycle) disc, as opposed to rim, brakes?

    I'm kind of souring on disc brakes and am even contemplating taking the disc brakes off one of my recumbent tandems* and replacing them with v-brakes instead. What are your thoughts on the pro's and cons of the two types of brakes? In my experience disc brakes perform slightly better in stopping...
  7. W

    Hub motors vs mid-drives: is unbiased comparison possible?

    I've looked around the web for a bit now, hoping to find some more or less unbaised assessment of how hub motors compare to mid-drives. So far I've not turned up much. I have no experience with mid-drives, but do have some familiarity with hub motors. My original upgrade plan from my first DD...
  8. W

    Battery BMS disconnection queries

    I'm gearing up for the coming cycling season and even managed--finally--to get the electric-assist rig out for a ride. But I need to take it off the road again for 2-3 weeks (hopefully) while I do my spring tune-up. This first ride has sparked my memory about a question I wanted to ask about...
  9. W

    Self-healing battery

    Surprised I haven't seen anything on this recent news item here: "A self-healing silicon electrode could mean a longer battery life for your smartphone, laptop, or electric car" (or bike) Among other places, at...
  10. W

    help with wiring up my new kit?

    I got my new hub motor built into a wheel and so am ready to hook up everything to the bike. I'd like to ask for a few pointers. Bear in mind that, although I've worked a bit with electricity in some building construction and building maintenance stints and so do know some basics, I'm not real...
  11. W

    Plug-in hybrid bicycle?

    I've only done a little searching relating to this topic but have so far not turned up anything fully relevant. So, what is the topic and how did I formulate this query? To deal with the latter first, I formulated the query based on my own riding style and needs. To the point, I'm interested in...
  12. W

    wheel-building question

    I got my Bafang hub in the mail along with a rim and some spokes. I commenced to building up the wheel and have a some questions based on a couple of photos I'll include. But first, a bit about my wheel-building experience. I've built a few sets of standard bike wheels in my time. Most were...
  13. W

    electric assist acronym/abbreviation dictionary

    All manner of acronyms and abbreviations relating to electric assist get thrown around on these forums. You've got a DD motor, and your BMS on your lipo is malfunctioning, etc. Despite the fact that I have a bit of experience with electric assist and a grasp of some of the technical...
  14. W

    Cycle Analyst computer interface questions

    I've been planning to get the CA for an intended e-bike upgrade. I'm now trying to familiarize myself with its capabilities and operation. Hearing about the various functions it has, I've been wondering to myself whether it might not have some computer interface. Persuing some of the information...
  15. W

    "True assist": is anyone else doing this?

    I've been a dedicated cyclist for most of my life. I did a bit of racing (mostly amateur-level criteriums, with a few time trials and road races thrown in) in my younger years. I also did some cross-country touring back in those days, riding one year from CA to the midwest and another year from...
  16. W

    Double motor friction drive on Amazon

    Electric Vehicle Outfitters: anyone ever heard of this seller/supplier? Said to be made in USA. The Amazon page (http://www.amazon.com/Electric-Bike-Conversion-Double-Motor/dp/B00BC33QJ6/ref=sr_1_1?ie=UTF8&m=A22JUYPM35MWSN&qid=1365629771&s=generic&sr=1-1) doesn't really say much. But I did find...
  17. W

    Electric assist upgrade / DD hub drag geared hub drag

    Hi. I'm getting ready to upgrade from a direct drive hub motor. The motor has served its purpose of helping me familiarize myself with electric assist, but the drag it experiences when not under power predisposes me against DD hub motors. That, in turn, has to do with the way I ride and use...
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