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  1. Q

    'lightest.bike' 1.7kg 1000w mid drive

    Interesting reply: You went for the friction issue, while I had rather weight and overall number of components in mind. My point is: if you already have the component, you might use it for gearing as well. Keeping system complexity as low as possible seems always a smart move. BTW $30 is also...
  2. Q

    'lightest.bike' 1.7kg 1000w mid drive

    If the mid drive is intented for the maxarya, an IGH would habe been redundant, since that bike requires a rear chain tensioner anyway. The true benefits of IGHs only makes sense if you have horizontal or sliding dropouts in my opinion, since a chain tensioner is basically a derailleur...
  3. Q

    'lightest.bike' 1.7kg 1000w mid drive

    This one's easy. You can find them in the dealer's manuals. Here a link to a dealer that listed some of the most common hubs. Though the values are way too conservative in my opinion, so it won't help you much. I'd put my two favorite shimanos the nexus 3 and the alfine 8 at 120 n.m-2 and 80...
  4. Q

    'lightest.bike' 1.7kg 1000w mid drive

    What data do you need ? I have plenty of shimano docs laying around...
  5. Q

    'lightest.bike' 1.7kg 1000w mid drive

    So it's the same study. Too bad Oehler did not include the best shimano ( 3 speed and alfine 8) and older sachs/sram hubs.
  6. Q

    'lightest.bike' 1.7kg 1000w mid drive

    Where did you get that from ? Here in Europe, there is a german study widely spread around. While it's true that under ideal conditions a new clean derailleur will beat any IGH, those conditions are very rarely met, so that in most everyday scenarios, efficiency between a good IGH and a...
  7. Q

    'lightest.bike' 1.7kg 1000w mid drive

    Chain wear depends little on quality and a lot on maintenance/use: a long chain rolling over large sprockets will distribute forces better and hence resist to wearing/elongation longer than a short chain on small cogs. But this becomes irrelevant is the chain is constantly full of dirt, as the...
  8. Q

    'lightest.bike' 1.7kg 1000w mid drive

    I have some experience with IGHs. Only one able to take full power of 1kw mid drives are 3 speeds, though shimano and legacy sachs / srams are way better then SA since the takeover by sunrace. The newer shimano 5 speed has supposedly been developped with middrives in mind and comes with an...
  9. Q

    Tire Concentricity

    Schwalbe advise to use lube all around the tire seat. Then slightly overpressure and the tire will jump right into the correct position. Only works with new tires and flanged rims.
  10. Q

    Spreadsheet of mid drives available in 2024

    Nice. Missing cyclone kits though, and a few others less known, like the yalu kit.
  11. Q

    Bms refitting info..

    Usually bms allow for some sort balanced charging, which means they try to avoid the explosion of one series group while the others are barely charged. Do do that, the board needs to be connected to each cells groups, as shown on this simple pic of 3 cells in series. On a sidenote: it's usually...
  12. Q

    New Fat Tire BBSHD Build From Scratch! Need HELP Selecting Components!

    This should probably go into the Ebike Build Threads subsection...
  13. Q

    6 Bolts or Splined adapter for Bottom Brackets ?

    Interesting reply. I'm not sure how I would fit a belt sprocket on a bmx crank, but the trial crank thread could work. Do you know if the threading is the same as for one of those 6 bolts adapters ?
  14. Q

    6 Bolts or Splined adapter for Bottom Brackets ?

    Good idea, but also not easy. Tandem chain usually go from crank to crank. Those using left side drive up front need freewheel adapters with much larger sprockets than mine. I guess machining is the only real option. Not that hard either: I just need a cheap crank with a sprocket pressed in that...
  15. Q

    BBS02 loud noise once per pinion rotation

    Can't see the vid.
  16. Q

    Rad Power Batteries are now UL certified and fully potted

    Why would anyone pot a battery ? In all batteries I've seen, repaired, corrosion problems occur wayyyy after one of the cells, the bms ... or just the plug holder failed!
  17. Q

    6 Bolts or Splined adapter for Bottom Brackets ?

    Thank you for your reply. Finding sprockets is no the issue - the tricky part is to mount them onto the BB:
  18. Q

    Heinzmann CargoPower RN 111 Motor

    I've been tracking that motor for over 4 years. The current status is that the cargo power system is available but Heinzmann won't sell to end customers - only bike manufacturers. There is one german bike store that plans on carrying it, but they are waiting for Heinzmann to release the motor -...
  19. Q

    6 Bolts or Splined adapter for Bottom Brackets ?

    Hello, I want to use a standart BB (tapered, isis - doesn't matter) as jagshaft. This would require a way to mount sprockets on both sides - unfortunately, cranks only come with 104 odr 130mm bcds, which is too large for small sprockets. So milling a crank is not really an option (besides...
  20. Q

    Converting a hubmotor to a middrivemotor

    Interesting build - thanks for sharing it!
  21. Q

    Converting a hubmotor to a middrivemotor

    Hello, 12 Years after the start of this thread, are there still people doing hub motors to mid drive conversions ? I understand it's quite hassle if you want to build a proper heat bridge and a solid cog mount, but my semi recumbent project happens to be one of the few situations where this...
  22. Q

    Drum and Roller brakes

    Looking for a good alternative alternative to disc brakes. They do the job and stop wheels on all our bikes, include the heavy cargo, but at what cost: I find myself constantly readjusting wheels and bending back rotors because they keep grinding on the pads. It seems one hard break a full power...
  23. Q

    High performance & durability Cannondale Semi Recumbent

    Do you have a drawing ? Would be interesting to see if it can be built. I have the sx1 up front on my utopia an can confirm that handling improves up to a certain rack load and/or slope steepness. Than it starts slipping. It works better than expected though, especially in terms of battery...
  24. Q

    High performance & durability Cannondale Semi Recumbent

    I wouldn't be so quick to dismiss it. The guy building them has been doing so since 1986. He won multiple prices for the fastest and sturdiest semi-recumbent. Here is the classic model with less aggressive steering: Front fork is hand welded cromoly with elastomer suspension. Apparently it's...
  25. Q

    For those that miss the sound of a gas engine..

    Made my evening - lol! Crazy frenchies...
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