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  1. M

    Kepler Bottom Bracket Friction Drive For Sale (Finally)

    Still watching this in the hope I have a suitable bike at some point (I'm thinking of a stealth single speed ebike that looked low key enough to safely lock up in a big city without getting knicked). A question: are there any build threads around? I know all about Kepler's results, but I'd like...
  2. M

    Lightweight/discrete Q128c commuter build on a road bike

    Thanks for the reply motomech. I always knew it would be a risk to run the 328rpm motor in a 700cc wheel, however the trigger for my problems was nearly doubling the highest sustained power I'd ever run it at. I checked the wiring (I assume you meant between the controller and the motor) and...
  3. M

    Lightweight/discrete Q128c commuter build on a road bike

    So after ~1500kms of reliable service I managed to damage the Q100C motor by pushing a bit too much power into it. Normally I would never run the motor at sustained powers in excess of 450watts, however I was running late and so ran it at ~900watts for 10 minutes or so. In hindsight this was a...
  4. M

    Lightweight/discrete Q128c commuter build on a road bike

    This thing is tiny! For now I just wedged the temperature probe between some of the fins on the controller, with the lcd mounted on the handlebars. I see this as a temporary setup, really just to give me a feeling about whether the controller has any chance of overheating under my typical...
  5. M

    Lightweight/discrete Q128c commuter build on a road bike

    Yes having excess battery capacity isn't really a problem, much better than the alternative anyway! I have been charging to 90%, and since I only work one in two days (vs 5 in 7 for people doing 9-5), I think my battery is going to provide many years of service. It is the 52v 721wh battery by...
  6. M

    Lightweight/discrete Q128c commuter build on a road bike

    Thanks for the continued interest and replies. I'm also running the large s12s controller (part of the reason things only barely fit in the bag!). I've now done my commute three times, most recently averaging 330watts at the motor. This pushed my average speed (over the whole commute inc stop...
  7. M

    Lightweight/discrete Q128c commuter build on a road bike

    Must be time for a photo! Here's how things currently stand: My goals for this build were for a lightweight/discrete commuting bike that could assist me to increase my average speed. Is it lightweight? Total added weight was 7kg, so I hesitate to give myself a pass there, although it doesn't...
  8. M

    Lightweight/discrete Q128c commuter build on a road bike

    Update: loosening off the nuts has mostly eliminated the click. Now it is faint and only heard when I'm on the bike and peddling (can't hear it coasting anymore, or if I peddle it unloaded). Based on the above I think I'll just monitor it and get it looked at if it's still occurring after a few...
  9. M

    Lightweight/discrete Q128c commuter build on a road bike

    Thank you for the ongoing help, it really is appreciated. I feel like it's so close to working! Some other data points: The first time I installed the wheel I didn't put the washers in that go inside the dropout. Still clicked, but it fit perfectly with no need to spread the dropouts. It stops...
  10. M

    Lightweight/discrete Q128c commuter build on a road bike

    So pulling the wheel out and taking the cassette off led to the noise disappearing when I spun it, so I put it back all together. When I only did the axle nuts up loosely there was no click. When I tightened them right up however the click came back! Loosening off one nut (hand tight still) led...
  11. M

    Lightweight/discrete Q128c commuter build on a road bike

    Thanks heaps for the reply. It's nothing external contacting the wheel, but it could be a piece of debris somewhere around the cassette (best case scenario!). I suppose there's a fair chance the fault is inside the motor case, so I suppose I better do some research on disassembling it.. It's so...
  12. M

    Lightweight/discrete Q128c commuter build on a road bike

    Ok so everything is now installed and working based on a test ride. Now though I can hear a faint clicking sound or 'tic' sound when the wheel rotates. It is happening only once a rotation, and independently of whether I'm coasting, peddling, running the motor, and with or without weight on the...
  13. M

    Lightweight/discrete Q128c commuter build on a road bike

    Yes that did the trick! Unfortunately my battery/controller mounting plan and my backup plan haven't panned out satisfactorily. I think I will be buying a rear rack now.
  14. M

    Lightweight/discrete Q128c commuter build on a road bike

    So I have started putting it all together. First hitch: do I file out the (aluminium) dropouts to get the axle to sit all the way down? At present there is a ~1mm gap at the top/arch/crescent of each dropout with the axle. Pics attached. My hunch is the off side is sitting deep enough that it...
  15. M

    Lightweight/discrete Q128c commuter build on a road bike

    The manufacturers of the sealant recommend checking it every week, and some say it should be replaced as often as every three months in hot climates. Since I haven't had a flat for months with a tube setup and the tyres I can get locally are cheaper I'll stick with tubes for now.
  16. M

    Lightweight/discrete Q128c commuter build on a road bike

    Everything is more expensive in Australia for various reasons. I probably could have saved $150 with a cheaper rim and thinner spokes, but I went with the advice of the shop. I think next time I'll have a go of building it myself, but this time I paid the premium for a professionals work and a...
  17. M

    Lightweight/discrete Q128c commuter build on a road bike

    So bits and pieces have been arriving in the mail, specifically the q100c 328rpm 36v motor, s12 controller etc. I'd read that ordering the motor built into a wheel from bmsbattery could be hit and miss so instead I got a local place to build a wheel, and since I wanted to avoid flats I've also...
  18. M

    Lightweight/discrete Q128c commuter build on a road bike

    Thanks again for all the input, it is all appreciated. I'm now settling on the 328RPM@36V q100c paired with a 48v battery or a 52v battery (unloaded rpm of 455 with 50% unloaded speed of 23kph) from em3ev. Looking back over my ride data I'm confident I can keep the bike over 23kph for 90+% of...
  19. M

    Lightweight/discrete Q128c commuter build on a road bike

    I have read all the replies with great interest (and checked out the simulator!) and now my head is well and truly spinning. For the record, my commute is long, flat, and quiet - some days the only time my feet touch the ground are when I set off and when I arrive. Thus aside from my 4 hills...
  20. M

    Lightweight/discrete Q128c commuter build on a road bike

    Ok cool, thanks for clarifying the noise situation, it sounds like it shouldn't factor in to my decision. In MonkeyWrench's build it looks like he is using 2x 6s lipos. Does that then equal 2x22.2v = 44.4v? Does that mean his motors unloaded rpm is (44.4/36) * 328 = 404rpm? If I was to go for...
  21. M

    Lightweight/discrete Q128c commuter build on a road bike

    Thanks so much for the continued help and advice, I really appreciate it. Based on the last few months of commuting I find I always have good power in my legs for at least one leg of the commute, with the post nightshift rides the ones where I struggle a bit (average speed drops to around...
  22. M

    Carbon Cyclocross Drop Bar Commuter Q100C

    Awesome bike and post, very helpful and inspiring! Looks like you more than met your design goals. As you know I'm looking at doing a very similar build. One question that may fit here best: what do you think the likely pros and cons are of going with the q128c, all else being equal (ie same...
  23. M

    Lightweight/discrete Q128c commuter build on a road bike

    25kph is my average speed including lights, stop signs, hills etc - just the total distance divided by the total time as reported by my trip computer. If I really push I can sustain 35-38kph on the flat in good conditions, bringing my average trip speed up to around 27kph. I only bring that up...
  24. M

    Lightweight/discrete Q128c commuter build on a road bike

    Sounds like my commute is pretty flat in comparison (130m or 400ft elevation gain, 100m or 300ft loss, split over about 4 hills over the 16kms or 10 miles). Also I ride about 10kms on smooth dedicated bike paths, and probably only have a dozen roads where I have to yield (although there's...
  25. M

    Lightweight/discrete Q128c commuter build on a road bike

    Thanks mate, I appreciate the thoughtful response, I hadn't really thought through the real world energy requirements. Charging at work would be problematic unfortunately, so I need to have a battery sized for a return trip. I've seen a few comments around Endless Sphere that imply an active...
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