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  1. Bush mechanic

    Any (Preferably educated) thoughts on using Bafang G62 for a heavy cargo bike?

    Playing around with the motor simulator it seems the G62 motor actually surpasses the Mac / GMac motors in terms of hill climbing ability. I’ve been pretty impressed with the G310 in terms of build quality although sadly the bigger motors don’t use helical cut gears, so I’m starting to wonder...
  2. Bush mechanic

    FS: Yuba Monkey Bars, cargo bike carrier for two children (Australia)

    Lucia, appreciate the offer but I’m currently deployed on a military oil rig in Nigeria without phone reception and cannot leave the country until my Royal half brother finds a trustworthy stranger willing to accept and share our 10 million BTC inheritance. Would you be interested? If so can...
  3. Bush mechanic

    Suggest me a strong 26" rim ~40mm width

    Yes it’s a shame there aren’t many options. I’ve actually just ordered a pair of the pick up’s in 26x2.35 which seem like a pretty solid tyre
  4. Bush mechanic

    FS: Yuba Monkey Bars, cargo bike carrier for two children (Australia)

    Bought from Cargocycles in 2021, sat in the box for the first 18 months because I start too many projects, fitted for one ride only to find the kids had outgrown it, and now it's just taking up space! Good condition, you will see a few scratches on the telescoping section of the tubes and marks...
  5. Bush mechanic

    Replacing axle on a GMAC

    This would make the ultimate motor! I love the Bafang G310 I have on my daily commuter, it is fairly delicate of course being so small (4th set of gears I think?) but man it is quiet. Sadly I think I am a long way from having the skills to successfully do such a conversion on the GMac though! I...
  6. Bush mechanic

    Replacing axle on a GMAC

    That's an awesome write up, thank you! I'll wait to hear if i can get an axle and pencil this in as a job to do. Did you ever find a way to meaningfully reduce the noise of the GMAC? I've got a love-hate relationship with this thing. Fantastic torque for its size but I hate the noise more and...
  7. Bush mechanic

    Replacing axle on a GMAC

    Whether it is just normal wear and tear or other factors too, the axle threads on my GMAC look pretty awful. I popped the non-drive side cover off while I had it off the bike and had a quick look inside while I was at it, quite impressed actually that there is very little visible wear on the...
  8. Bush mechanic

    Spreading rear dropouts. How far is too far?

    Seriously though I would probably avoid bending ie setting aluminium as such. I've just pulled it apart on hardtail frames to fit slightly wider hubs which is easy, and I'm sure is fairly safe, but keep in mind if the metal is flexed and already stressed and then you start applying all kinds of...
  9. Bush mechanic

    Spreading rear dropouts. How far is too far?

    Oh God. Why did you have to ask about the low density metal widely used for bicycle frames. Prepare yourself for Safety Advice. They are coming.
  10. Bush mechanic

    Spreading rear dropouts. How far is too far?

    Thanks Chalo. I'll think on the idea for a while, I feel like the frame can *probably* take it. What's prompted this is seeing Grin are bringing out a fat All Axle with 45mm stack (6kg) later in the year!
  11. Bush mechanic

    Spreading rear dropouts. How far is too far?

    Thanks guys good points as always. @Chalo , is it fair to say that offset becomes less of an issue the more we increase chain length? One of the bikes I'm thinking of is a longtail Yuba Mundo, it does have a bridge, but was surprisingly easy to set at a little over 140mm when I a did that a few...
  12. Bush mechanic

    Spreading rear dropouts. How far is too far?

    How far have you spread the rear stays on a steel frame? I'm not talking about 138mm axles in 135mm dropouts here! Who has done 135mm to 150? 170? How far did you bend it to set the frame there, and has anyone had their frame fail? There are threads on techniques and individual cases, but it's...
  13. Bush mechanic

    Trying to choose an Ultrasonic cleaner that is not cheap and nasty

    Leaking tanks, lower than advertised power output, excessive audible noise, and ineffective heating seem to be the most common complaints regarding Vevor. Harbour Freight units sound OK from what I have seen but we don't have them in Australia. What concerns me is that I suspect a lot of the...
  14. Bush mechanic

    Trying to choose an Ultrasonic cleaner that is not cheap and nasty

    Not really sure where to post this, hopefully this will do. I need something with a minimum 5L capacity for tools, toys, PCB's etc. Has anyone here tried any different brands they can compare? It seems the market is flooded with the cheap 'Vevor' brand units which have fairly poor reviews if...
  15. Bush mechanic

    Dual batteries in parallel (different capacities)

    Not an engineer and never had a system exceeding 2000w, but I've done this for years without issues with much lower power packs (14s drawing 40A total), using a mix of batteries. It can work perfectly well in principle as already stated above, but I don't think what you are proposing, at least...
  16. Bush mechanic

    Electrifying a cargo bike - Mid drive or Hub?

    Unashamedly biased, but 10 years riding a heavy long tail yuba with various rear hub motor configs (26"), I would put a good rear hub into that 20" wheel without a moment's hesitation. If you can afford the outlay to get a suitable motor pre laced it's a fast, clean, and simple way to get...
  17. Bush mechanic

    1st battery build (20s2p) - collective advice?

    The main contenders I have in mind are 30T, 40T, and P42a cells. To clarify, continual discharge around 10-15A, but it's going to need to handle 20-30A for one or two minutes at least
  18. Bush mechanic

    1st battery build (20s2p) - collective advice?

    Thanks guys, as you've all mentioned it, yes I have to agree entirely, it is going to be a rough and probably shortened life, and have to admit this is a bit of a novelty or luxury. The 1p idea is intended for my around town commuter where 15a rate does go a long way. Still rough I know and...
  19. Bush mechanic

    1st battery build (20s2p) - collective advice?

    Lads, I'm hoping to gear up and start my first DIY battery build in the not too distant future. I do still need to collect the equipment needed but am keen to start soon. I am just tired of paying top dollar for what usually ends up still not being quite the right shape, capacity, cell type, and...
  20. Bush mechanic

    26" wheels in 700c frame

    Thanks for putting it into perspective, maybe not as unreasonable as I'd thought. Yes the 26x3.0 sounds good, I wish there was a high quality commuter stye tyre in this size - sadly nothing that seems on par with Big Apples or other Schwalbe offerings. I'm tending towards Kenda Flame's 26x3...
  21. Bush mechanic

    26" wheels in 700c frame

    I know it's been discussed in many places on the internet, from 96er' to 69er's and the rest, but I'm wondering if anyone here has tried 26" wheels on a 29" frame, in particular with tyres that bring those wheels up to something close to 700c? For some background, I've been eyeing off a Marin...
  22. Bush mechanic

    Suggest me a strong 26" rim ~40mm width

    Good point, not much open length, but should be OK in a 26 inch wheel. Thanks once again. Will see if I can pick one up at a good price.
  23. Bush mechanic

    Suggest me a strong 26" rim ~40mm width

    Has indeed been my method once or twice, stuck many k's from home!! Out of interest what are your thoughts on the Park TM1 spoke tension meter? I am thinking of getting one for future builds and maintenance. The three hubs I have laced from new have all held up really well but it's been done...
  24. Bush mechanic

    Electrified (vendor of ebike parts, Australia) - Has anyone used them?

    I can't speak from experience, but they are rated pretty highly from what I have read in the past, apparently have supplied NASA applications (not sure what), and popular in vape circles for high output and lifespan
  25. Bush mechanic

    Electrified (vendor of ebike parts, Australia) - Has anyone used them?

    https://ntrs.nasa.gov/citations/19880001642
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