polygon

I'm intrigued what the best hub motor is.

Yeah the Mycle offerings look decent, smaller range of accessories, though, and ultimately I don't think we need a cargo bike that heavy duty. We live so near to a supermarket now that I'll be getting the weekly shop. Only 1 kid and no plans for more. The major positive for the Tern is that it can adjust to me and my wife, and I think will be nimble enough to make her want to ride it. Being quite petite, I think she'd find a big long tail like the Mycle or GSD too unwieldy, though this is based on nothing but speculation currently. I was quite interested in the RADwagon before they withdrew from the UK.

I've found a Tern HSD locally with 1100 miles on the clock for £1.9k. I've wanted one of these for a while due to the potential for my wife to use it and carry our child around on her day off, rather than always taking the car. The other 4 days of the working week I'd be committing on it, 5 miles each way with child drop-off after a mile. Going back and forth on whether to DIY the Genesis Vagabond frame sitting in my garage. Obviously the wife wouldn't be able to use this, higher centre of gravity, no dedicated accessory range like the Tern has. Positives: Far smaller initial outlay, probably less than half the cost of the Tern, probably a slightly better ride due to the bigger wheels. Anyone been through the same debate and have anything to offer either way?

On what wheel size are we talking? Not sure what you mean by over-specifying, I'm mainly just trying to not buy new components. Fair point about going without the TS though, I keep forgetting that's an option!

I was very close to pulling the trigger on the Woosh BBTS/DWG22C kit but I'm getting myself tied in knots in regards to gear ratios and chainline. I understand chainline isn't so critical on an assisted bike, but I'm struggling to understand how some of these numbers are workable. Currently waiting on some answers from Woosh, here's what I don't know: Whether I can use the BBTS with my current cranks (Middleburn R01 W/ RX7 Narrow Wide 32t chainring). They said I could in an email but I saw someone from Woosh say that it wasn't possible using 3rd part cranks with the BBTS on another thread here. What Chainline is achieved using the stock cracks with the BBTS They've told me that the spindle on the BBts is 144mm, currently I get 50mm chainline with the Middleburns on a 113mm BB, so looking at c.65mm using the BBTS which just sounds crazy. Will have to wait and see what they say the stock cranks chainline is. At 50mm my biggest sprocket is a touch noisy but perfectly usable, at 65mm I don't imagine the lowest few gears will be usable, which may not be a problem as I understand grinding up 20% inclines is not great for a hub gear anyway. I built the drivetrain with gravel/mountain biking in mind: 32t chainring and 11-42 10 speed cassette. Now I'm planning to use the bike for commuting and child transport. It'll be roughly 10miles 4 days a week with an elevation gain on the way home with gradients between 1 and 5%. My best guess is that with assist the gearing will generally be too low, though the Sheldon brown calculator says in top gear I'll be hitting 20mph @80rpn so I guess I'll not be outrun by the motor. Worst case I won't be using the low gears at all. The other limiting factor is my chainstays clearance. They flare out steeply from the BB above roughly 34t I'm going to have to bring the chainline out beyond 50mm anyway. Something like a 48t would probably have to be 55mm or more to completely clear the chainstays as this will be beyond the diameter of the indent in the chainstay. In this way the 144mm spindle of the BBTS might not be so bad. If I can use the Middleburns and I did want to bring the chainline back in a bit they do an offset spider designed for use on their external BB cranks. Can't find exact details but I think it's offset about 8mm inboard as , probably bringing be too about 55mm. If I get the double 130bcd spider this gives a bit more leeway either side. This is all just speculation. I just need to get on and order the kit really and see how it works out then make adjustments to suit. Just writing this out for my own purposes more than anything.

Looking closer at the BBS01B drawings in pretty sure it won't fit, can't find the gearbox diameter for the tsdz8 or tsdz2 but I imagine it's probably similar. My chainstays flare out quite a lot near the BB. So probably looking at a hub motor or no conversion at all.

Now leaning towards the tsdz8 from Woosh, but having trouble working out whether it will fit my frame. Are there any sure fire methods to work out whether fitting will work prior to ordering, or if I'll have a horrible chainline? The bike is 68mm bb. Just over 100mm wide at 100mm out from the BB centre with a small dimple in the drive side stay. I'm most concerned about the gearbox clearance as I can always go smaller on the chainring, though that might involve adapters and such.

Just to be clear I'll be keeping this UK compliant. The programming cable was an after thought in case I wasn't to tweak other settings.

Cheers, I'll running full guards so spray shouldn't be a problem. From memory I think I can get an oversized bottle cage on the seat tube plus a ticket one on the down tube so hopefully that means the mounts are reasonably high on the DT.

Better in what way? I must say torque sensing does appeal, but for my use case (i.e commuting where the end goal is to expend as little effort as possible for a relatively short distance) from what I have read, it might not actually be the best option. Plus, it's anecdotal, but I'm reading more stories of reliability issues with those than the Bafang.

That's actually not a bad price, about £170 more with a 15ah battery, but I'd also need the hydro brake switches on top. Not sure if I'll need the extra 20nm on a day to day basis, but it might be handy to tackle some steeper hills to the north of Cardiff with child on the back occasionally.

This one https://greenlance.co.uk/products/greenlance-e-bike-battery-samsung-electric-bike-battery-36v-16ah?variant=44352834896101 Edit: sorry replied to wrong post there. Another newb question: it says 25-30 mile range, but presumably this isn't fully draining the battery? At what % should I be recharging?

Ok thanks for confirming. So they do a 16ah 36V battery for £250 so will probably go with that. As far as I can see the BBS01B is only available in a 36V version.

Not sure I fully understand the amps thing, I'm not looking to go outside of EAPC spec as I'll be getting the sprog. Seen the high torque mod model from that Brighton company but I won't be pulling much weight uphill most of the time so I think stock BBS01B should do me most of the time, just aware I might want to tweak a few things.

The other thing that puzzles me is whether 2 water bottle bosses are enough for the battery mounting, assuming it fits in the frame in the right place.

Do Greenlance fall in to this category? Definitely keen to not skimp on the battery or charger. Would also happily pay for a charger that shuts itself off when it's reached capacity if such a thing exists, although maybe this would encourage complacency from me. I wonder if Red Dragon are local to me, they appear to be in Wales though I can't place exactly where.

So I'm thinking of just buying all the kit for the conversion of my Genesis Vagabond soon. An upcoming commuting increase to 5 miles each way with nursery drop one way and some elevation gain the other means I'll probably need some help if I'm too avoid feeling knackered by the weekend. So far my shopping list is as below: Bafang Bbs01b - probably from eBay Germany (I'm in the UK) can't see that it's loads cheaper from AliExpress, looking at about £315 for basis kit same battery. Greenlance 48v 13ah battery - will this play well with the 36V motor? £205 w/discount Hydro brake sensors - included in above kit SW102 display - included in above kit Gear shift sensor Programming cable Lockring tool so I can use my torque wrench Loctite 222 Zip ties I'm hoping I might be able to use my Middleburn cranks but I think the taper is quite short on the bafang. Anything in missing, or hot tips on better places to buy? My budget is a little flexible but I've a few other bits to get like new tyres and bars so definitely as low as possible without regretting it later.