Bafang BBS02 chain line

[JohnCade]

I went out this morning for a short ride after breakfast, it was a bit too cold for my liking, came back for coffee and donut.

It’s blowing a yachtsman’s gale straight from Siberia where I live and I went for a long walk instead.

 

[Fordulike]

the bigger the chain ring, the bigger the problem keeping a perfect chain line.
With the 750W, I think Bafang made an error fitting 48T, should have fitted the smaller 44T.
The motor running too fast for me anyway.

Trex, even if the offset is the same on the smaller chainrings, could you explain why a smaller chain ring improves chain line. Newbie style if possible

 

[trex]

the angle formed by the ring plane and the rear sprocket plane is proportional to the ring diameter and the sprocket diameter.
Smaller ring gives you smaller angle.

http://homebicyclemechanic.com/perfect-bicycle-chain-line/

 

[Kinninvie]

All the standard chainrings have the same offset.I have a 44T on mine and also a 48T (but not at the same time).
The 48T misses the chainstay by 1mm.

 

[Fordulike]

the angle formed by the ring plane and the rear sprocket plane is proportional to the ring diameter and the sprocket diameter.
Smaller ring gives you smaller angle.

http://homebicyclemechanic.com/perfect-bicycle-chain-line/

Sweet, thanks

 

[Fordulike]

I'm going to go down the route of getting a stock 44T from Em3ev, to see if that improves the first and second gear issue. It'll improve torque in third gear anyway, if it doesn't work.

http://em3ev.com/store/index.php?route=product/category&path=46

I want to try out their left sided thumb throttle and push button e-brake, so it'll be pennies more to add the chain ring.

 

[Kinninvie]

I use a standard thumb throttle on the left and it works perfectly.

 

[Fordulike]

I use a standard thumb throttle on the left and it works perfectly.

It's the cable exiting the left side that I don't like.

 

[mfj197]

It's the cable exiting the left side that I don't like.

Turn it over. I had it on my bike for a little while that way, pushing forward over the handlebar to go, cable exiting to the right.

Michael

 

[chain]

It's the cable exiting the left side that I don't like.

The cable on the thumb throttle is pretty flexible. I mounted the thumb throttle on the left in normal alignment (thumbrest down down for faster) and tiewrapped the cable back on the throttle body towards the trunk cable at the centre of the handlebars.

I used a right hand thumb throttle in exactly the same way at the left of the handlebar on my previous installation and after several years the cable showed no damage when I removed it to fit the BBS01's thumb throttle.

 

[filboov66]

This simple bodge keeps my chain on

 

[New Mariner]

the chainline issue with bbs01 was a problem on my bike too so I bought this 42th chainring and it makes a much better chainline as the original Bafang now I can use all gears and no problems anymore, it is good but not cheap:
http://www.alcedoitalia.it/shop/accessori-bbs/corona-42-denti-per-bafang-centrale-bbs01/
one other chainring I found was that one it´s a bit cheaper:
http://www.edibike.it/prodotto/corona-singola-42-denti-per-suzhou-bafang-8-fun-centrale-bbs-01-02/
If you have a trike with a longer chainline you can think about this one, a double chainring 42/48 front:
http://www.edibike.it/prodotto/corona-doppia-4248-denti-per-suzhou-bafang-8-fun-centrale-bbs/

if you search the net you can find a lot of choise´s for the bbs-motor and with them it´s possible to find a solution for any problem

on my "Bigfoot" fatbike outfitted with bbs01 I use a 32/38 double chainring thanks to the long distance between bottom-bracket and rear-hub

What double chainring are you using and does it need an adapter? Thanks, Steve

 

[fos'l]

Didn't read the whole thread, so please excuse me if this was covered, but on mine I used a Luna Cycle "narrow-wide" ring with 30 teeth since the top speed of 24 mph or so was adequate for off road; the gears on my cassette are 11-17-28 with 8-speed spacing. With the motor I need only these three for all activities, and the chain line, which is in the middle with the 30/17 is perfect.