Recent content by arclarke

Excellent thread - thanks to all for the info. I've recently fitted a BBS02 to my Yuba Mundo, and at first didn't have the speed sensor working, till I got a cable extension. Without the sensor the controls went to error 21, but first let you select a PAS setting. There was no speed limit...

ditto on cadence. I've just got a 750W 48V motor, and it seems more powerful than I need, but is simple matter to restrict the PAS setting to around the 400W-500W level. I've realised if I'm in a hurry I can pedal at the max rpm of the 48V motor, so glad I don't have the 36V. The snag is...

I had thought I might need to put a smaller sprocket on the hub (it's an Alfine 8 speed), but actually it's fine for sensible cruising speeds (I did have a 38t chainring on before fitting the motor though, so still noticeably higher geared now).

Set on 9 stages. Not able to switch between them while riding at moment as display reports error due to speed sensor fault (sensor cable too short). Looking at the programming thread on these motors I wonder if the lack of wheel speed input is affecting the motor power settings?

Some Yuba pics battery box yet to come - pack just strapped on for now

I've finally got my Bafang fitted to my Yuba Mundo. I'd decided to go for 350W and ordered from Mr Spacey, but his delivery from China turned out to be BBS02s instead, so that's what I have. Blimey it's fast, not entirely sure it needs to be this powerful! I'm only running on power assist 4 or 5...

but 6 inches is a 20% change at that end of the range - quite a big jump...on my MTB I use a 40t 10 speed cog, but you can get 42t from OneUp components, with their wide range jockey cage plate for Shimano mechs - really works well and lot cheaper than going to 11 speed.

As you know, you'll be mainly paying for better forks and brakes. My wife's trek has about same spec of these as the model you're looking at and it's been great for trail riding. Personally I don't find Shimano 9 speed shifts as reliably as 8 speed or 10 speed - and I prefer 10 speed.

KMC make ebike chains in 9 and 10 speed: http://www.chainreactioncycles.com/kmc-x10e-ept-ebike-10-speed-chain/rp-prod120625 I haven't tried them - has anyone else? Advantage of more gears is more range - 36 tooth big sprocket, with 40/42 add-ons for 10 speed. (and btw I think 8 speed uses same...

I should add the 11-40 cassette is used with a MTB mech, and in fact I've just bought a "one-up" medium cage designed to work with 40-42t large cogs, as the downhill short cage mech was either too close to the big cog or too far from the smallest.

Len it doesn't always work - depends on the gear hanger - tends to be more chance with mountain bikes as they often have longer hangers. My wife's tourer definitely won't shift to 34t with a road 9-speed mech (works perfectly with deore mountain bike one) but my cyclocross goes to 32t with a 105...

Tom thanks for that, feels reassuring - after all adding a 350W motor is probably a 200% increase in power over just pedalling, which might be enough for an ordinary rigid fork bike. As I see it the battery side works out better at 36V since you get more cells in parallel and can cope with...

Nice lot of data there. Looks like you're drawing average 225W and getting avg speed 32km/h, overall 7Wh/km - promising.

Tom So my question is would you still buy the 350W, or are you feeling left behind now? Alan

Thanks for that - I guess a 750W derated to 18A is basically the 500W 48V motor. Still wondering if this would differ in use from the 500W 36V.