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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

    Well, I thought I was wrapping things up here, since no further comments had been made for quite some time. And now, some new input. Thanks for the additional information docw009 and John and Cecil, and especially for the link to an alternative kit.
  3. W

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

    With the aim of wrapping up this discussion I should mention that I finally ran across this thread: https://endless-sphere.com/forums/viewtopic.php?f=28&t=79788&hilit=Tsdz2 . That's a pretty lengthy discussion of the very kit I asked about in my second contribution to the current thread. I guess...
  4. W

    Help me turn my touring bike into a car replacement

    Here's a metric that is somewhat relevant but does not address your situation directly. I have a recumbent tandem trike (delta) to which I added electric assist a few years ago, using help gotten from this forum. My set-up has a range approximately close to what you're aiming for: when I first...
  5. W

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

    Thanks for your input, wturber. The bike will actually be located and used in the state of MI. I'm not sure what are the regulations there. But I'm pretty sure my friend's logic in prefering a lower-power assist has to do with the fact that he would like for his grandson to be more physically...
  6. W

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

    Anyone have experience with the Tongsheng TSDZ2 Mid Drive kit (https://www.amazon.com/TSDZ-Version-Tongsheng-Conversion-Torque/dp/B01MYRB6Q6)? That's the one we're looking at. Looks like it could be readily adapted to this bike: https://www.rei.com/product/851140/electra-townie-7d-bike. Bottom...
  7. 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...
  8. 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...
  9. W

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

    Yeah, the crankarm issue on tandems carries its own set of complications when it comes to mid-drives. But I was actually more curious about how you mounted the motor to the frame: the downtube on the standard upright bikes these mounting kits are made for is pretty much absent on a delta trike...
  10. W

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

    Thanks for your response, Rassy. Do you ever have misgivings about your storage strategy, given that storing these batteries at full charge is said to cause them to degrade? (see the recent thread "Is mantaining a cell at 3.6V overcharging?," where I specifically asked about advisability of...
  11. W

    My excellent adventure through some battery builds

    Interesting thread. Not working in IT, I don't have a source for free, cast-off laptop batteries. I'm also not real well versed in electronics. But I like the concept of, not just free, but of making good use of materials others just want to get rid of. Yet my main question in posting here is...
  12. W

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

    Sorry, but I really cannot understand what you are trying to say in your latest response, 999zip999. Something(s?) crucial to deciphering your meaning seems to be missing there. I'm trying to resolve discussion in this thread regarding battery balancing into some prescriptive advice I can...
  13. W

    Triple chainrings: a flawed concept/design?

    I've never had a problem shifting onto the large chainring on any of these bikes (well, except for an isolated incident where I had misadjusted the derailleur and wound up overshifting [chain fell off the crank arm side]). Another factor all these bikes have in common is, of course, chain...
  14. W

    Triple chainrings: a flawed concept/design?

    Yes, none of the three will shift to the small chainring when the chain is under the tension of climbing a hill. On the first tandem I thought maybe there was some misadjustment so I took it to the shop where I'd bought it. They worked on it and supposedly adjusted it, but it never worked...
  15. W

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

    Yes, I finally got all LED's to come on by leaving the charger connected for about 14 hours. After the latest charging cycle, fresh off the charger, all cells tested at between 3.56 and 3.60 volts. So it looks like the maximum capacity of this battery is going to be 42.7 volts or so. I still get...
  16. W

    Triple chainrings: a flawed concept/design?

    I believe Sram/Shimano components--I'd have to double check to give particulars. I've actually got 3 recumbent tandems, all with slightly differing components, and the shifting problem referenced applies to all 3. If the subtle pedal-cadence adjustment you speak of is the solution, that will be...
  17. 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...
  18. W

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

    Thanks for the further input and explanations, Rassy. I have another, perhaps daft question, regarding the lighted LED's we're discussing. They're all on now, and have been since I connected the battery last night and got the "charge complete" message from the CS. So when you say "the actual...
  19. W

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

    Appearances can be deceiving :). If "on top" you mean I am pretty close to having, or maybe even already have, all my cells balanced, you may be right. I think I'll try one more charging cycle using a standard LiFePO profile to test that. But the reason I don't feel on top of much of anything is...
  20. W

    Is mantaining a cell at 3.6V overcharging?

    With apologies if I am side-trackiing this thread, I would really like to know, as someone with a very limited comprehension of issues like battery chemistries and even electronics in general, to what level I should be discharging my LiFePO4 battery for winter storage. Sometime within the next...
  21. W

    Is mantaining a cell at 3.6V overcharging?

    But: So did teklektik not nail it on this point but did on others? I stored my LiFePO4 battery for over a year at full charge (had a bike maintenence issue that took me forever to get around to fixing) and am now putting the battery back in service so am wondering whether it might have degraded...
  22. W

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

    I'm not completely understanding your remarks, 999zip999, though the part about leaving the battery hooked to the charger for 24 hours (and maybe more?) is more or less clear. So I'm learning some things about battery balancing. I left the battery hooked to the charger yesterday for 14 hours...
  23. W

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

    I consulted with my more electronics-savvy friend about this. He said the right way to do it would be to touch the red probe of the volt meter to the contact on the back of the header to which the small black wire leads, and the black probe of the volt meter to the large black wire soldered to...
  24. W

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

    Thanks so much for the additional tips and graphics, Gregory and cell_man. At this point though I'm having a bit of trouble--due to my own rudimentary understanding of electronics--comprehending what I should be doing to get a voltage reading from the 12th cell. Let me describe in my own...
  25. W

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

    Thanks for the great tips and even photos! I was suspecting that might be where I could check, but was uncertain where to poke the probes. Using those tips, I was able to get voltages that appear to be close to what individual cells should be (all in the 3.31-3.32 volts range). At least for 11...
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