New Bafang Crank-Drives

[Warren]

Rudolf,

That makes 6 mm in the cranks and another 6mm through boring , 12mm all in all.

Thanks so much. Very precise work!

Warren

 

[pjgold]

Does anyone have any thoughts on fitting a BBS02 750w with a Gates belt drive.
I have the opportunity to pick up a Focus Planet TR1 cheaply, which has a 8 speed alfine and a gates drive.
I should be able to use one of the 4 spoke 104mm spiders that has been made available.
Looking to use this a a daily commuter with a cell man BBS02 and frame mount battery.

 

[Melbourne]

Does anyone have any thoughts on fitting a BBS02 750w with a Gates belt drive.
I have the opportunity to pick up a Focus Planet TR1 cheaply, which has a 8 speed alfine and a gates drive.
I should be able to use one of the 4 spoke 104mm spiders that has been made available.
Looking to use this a a daily commuter with a cell man BBS02 and frame mount battery.

From my reading about Alfine, they are limited in high(?) gears...so limited higher speed... True?

How much did u pay for the Focus Planet TR1? i was looking at allfine too but might be beyond my price range.

 

[m4s73r]

A triple chain wheel adapter is what this really needs. It may have been said already but what length are the cranks and will any crank work?

 

[flyingcubic]

im currently driving Alfine 8 with 1kw Motor in my powerbike without problems or limitations, but u have only 300% ratio its not so much
This Hub is good for high power Motors where u dont need much low gears for hillclimbing, so u can setup your hub for high speed
dont buy Alfine 11 its a crap hub

the ultimate hub u can buy, is the speedhub from Rohloff
but its more expensive than a Alfine 8

 

[Warren]

flyingcubic,

"im currently driving Alfine 8 with 1kw Motor in my powerbike without problems or limitations, but u have only 300% ratio"

There are now 10-44 cassettes so, in theory, you could get 440%. But with 1kW going through it, it will be scrap in a few hundred miles. A homemade 13-41, 8 speed should hold up pretty well, but you'd want a 52-53 chainring, instead of the stock Bafang, for 28-30 mph speeds.

 

[Warren]

m4s73r,

"A triple chain wheel adapter is what this really needs."

Not possible with any existing front derailleur, or workable chainline.

 

[flyingcubic]

i will never use derailleur gears again

 

[EVTodd]

I finished modding my 2001 Trek 7700 cross with the BBS01 and took a 26 mile ride yesterday. I used the kit and 36v 14.5Ah battery from LectricCycles.com. I used level 2 assist most of the time, and level 3 for the last 5 mile uphill stretch. Average speed was about 14MPH. I didn't use the throttle at all except for a couple of spurts to see what it felt like. At the beginning of the ride the fully charged battery measured 40.1V, and at the end 37.9V. The battery indicator on the 961 never budged off 4 bars. Recharge after the ride took about 2 hours.
This is really encouraging as I was fretting over range limitations. I'm 75 years old and ride for recreation and fitness, not for speed. Now I'm not so worried about getting stranded on a 40 mile jaunt.
A couple of notes on the installation: I didn't like the way the cables came out of the bottom of the motor through a somewhat loose grommet. I used liquid tape from Ace Hardware to seal that up, as well as sealing the cable grommet on the downtube mounting bracket. While I was at it, I sealed the rear of both the 2 pin connectors between the battery and the motor where the wires went into the connectors. I also swapped out the flat handlebars for classic north shore handlebars to get a more upright riding position.
The Trek original equipment had integrated brake/shift levers that had to go, as the BBS01 has its own brake levers, and since the front derailleur is removed, no shift lever is required on the left. I put the thumb throttle on the left. On the right, I used a Sram twist 9 speed to replace the Shimano rapid fire. The only other major change was replacing the front V-brake with an Avid BB7 disk. I had to buy a new front wheel to mount the disk. Fortunately the existing front fork had mounting holes for the BB7.
Overall, I'm very happy with the conversion and look forward to riding 3 or 4 thousand miles this summer.
UpRider

Nice review!

14 mph is a pretty good average speed on a 26 mile ride. I know I usually only average 15 mph on my normal ride to work and that's with riding fairly fast most of the time. All the starts and stops on a normal ride kill my average.

I'm curious what kind of top speed you're seeing with the 36 volt version in pas mode. I'm considering trying one of these this year but I really don't want to move up to 48 volts since I already have 36v packs. I also don't want the extra battery weight.

I'm sure someone mentioned it but this thread is getting huge. Can someone comment about if they're happy with how the 36v version climbs decent size hills?

 

[thetimp]

Yo! My odometer is stuck at 999 kilometers. It seems that it can't count any further.
Can it be reseted?

Assuming this is the trip odometer (versus total odometer), and you have the C961 display, hold down the power and minus buttons to reset. You can toggle between the trip and total odometers by pressing the power button.

 

[thetimp]

A triple chain wheel adapter is what this really needs. It may have been said already but what length are the cranks and will any crank work?

Cranks are 170mm. The problem is the chainring is separate from the right crank arm, but if you can find two individual crank arms (or tap out a left one to fit a right pedal), then you're good. It's a square taper spindle.

 

[m4s73r]

m4s73r,

"A triple chain wheel adapter is what this really needs."

Not possible with any existing front derailleur, or workable chainline.

OK i dont believe that at all. Sorry. Not after some of the stuff I have seen on here. why couldnt you just remove the gear cover and attach a bigger gear to where the cover used to be? Then a front derailleur to change up a gear.

 

[m4s73r]

A triple chain wheel adapter is what this really needs. It may have been said already but what length are the cranks and will any crank work?

Cranks are 170mm. The problem is the chainring is separate from the right crank arm, but if you can find two individual crank arms (or tap out a left one to fit a right pedal), then you're good. It's a square taper spindle.

That sucks on the crank size. Too big for bents... this situation cant be that hard to solve.

 

[ErikDK]

A triple chain wheel adapter is what this really needs. It may have been said already but what length are the cranks and will any crank work?

Cranks are 170mm. The problem is the chainring is separate from the right crank arm, but if you can find two individual crank arms (or tap out a left one to fit a right pedal), then you're good. It's a square taper spindle.

That sucks on the crank size. Too big for bents... this situation cant be that hard to solve.

I've borrowed a jig to shorten cranks from a recumbent builder, since he has found out that shorter cranks work better than standard 170mm cranks in their application.

 

[Warren]

m4s73r,

"OK i dont believe that at all."

Do it. You will be able to sell some.

 

[m4s73r]

Cranks are 170mm. The problem is the chainring is separate from the right crank arm, but if you can find two individual crank arms (or tap out a left one to fit a right pedal), then you're good. It's a square taper spindle.

That sucks on the crank size. Too big for bents... this situation cant be that hard to solve.

I've borrowed a jig to shorten cranks from a recumbent builder, since he has found out that shorter cranks work better than standard 170mm cranks in their application.

And Eric to the rescue. How did that work out for you? Easy to use?

 

[m4s73r]

Warren, Do you think that a 3 speed SA hub would work in lue of trying to add another crank?

 

[Kepler]

m4s73r,

"A triple chain wheel adapter is what this really needs."

Not possible with any existing front derailleur, or workable chainline.

OK i dont believe that at all. Sorry. Not after some of the stuff I have seen on here. why couldnt you just remove the gear cover and attach a bigger gear to where the cover used to be? Then a front derailleur to change up a gear.

Believe or don't believe it, thats up to you.

What I can tell you is the stock chain ring has an offset to tighten up the chain line. Even with the offset the chainline is only just acceptable at 50mm from the centre of BB.

To add extra chain rings and a front derailleur is quite doable in relation to making custom adapters however the chain line would make selection of a full range of gears on the rear derailleur impossible.

Consider the first chain ring will now be a small diameter and as such you will loose a few mm of offset due to the actual chain ring no longer having a built in offset. Straight away your best chainring offset is now 55mm. Usable but not ideal. The next chain ring pushes out another 5mm so now you have a 60mm offset. At 60mm there is no way you could select the low speed gears on your rear cluster.

It could be an option however if you just wanted to lock into using a single speed on the back with a spring loaded tensioner to take up slack with the front derailleur in operation.

Sounds like a fairly pointless exercise to me though. The stock chainring has been optimized to provide the best chainline for the drive. Mating this though as a good quality derailleur system works just fine. My 10 Speed Shimano XT rapid fire with clutch XT derailleur and KMC chain shifts like butter to all 10 speeds, never misses a gear, and gives me all the ratio's I need from 50kph high speed commuting to ridiculously steep hill climbs. Forget about the 10 speed chain strength argument. Pay a bit extra for a high quality chain and breakage wont be an issue.

 

[m4s73r]

m4s73r,

"A triple chain wheel adapter is what this really needs."

Not possible with any existing front derailleur, or workable chainline.

OK i dont believe that at all. Sorry. Not after some of the stuff I have seen on here. why couldnt you just remove the gear cover and attach a bigger gear to where the cover used to be? Then a front derailleur to change up a gear.

Believe or don't believe it, thats up to you.

What I can tell you is the stock chain ring has an offset to tighten up the chain line. Even with the offset the chainline is only just acceptable at 50mm from the centre of BB.

To add extra chain rings and a front derailleur is quite doable in relation to making custom adapters however the chain line would make selection of a full range of gears on the rear derailleur impossible.

Consider the first chain ring will now be a small diameter and as such you will loose a few mm of offset due to the actual chain ring no longer having a built in offset. Straight away your best chainring offset is now 55mm. Usable but not ideal. The next chain ring pushes out another 5mm so now you have a 60mm offset. At 60mm there is no way you could select the low speed gears on your rear cluster.

It could be an option however if you just wanted to lock into using a single speed on the back with a spring loaded tensioner to take up slack with the front derailleur in operation.

Sounds like a fairly pointless exercise to me though. The stock chainring has been optimized to provide the best chainline for the drive. Mating this though as a good quality derailleur system works just fine. My 10 Speed Shimano XT rapid fire with clutch XT derailleur and KMC chain shifts like butter to all 10 speeds, never misses a gear, and gives me all the ratio's I need from 50kph high speed commuting to ridiculously steep hill climbs. Forget about the 10 speed chain strength argument. Pay a bit extra for a high quality chain and breakage wont be an issue.

Ok I see what you're saying. My chainline is a little different being on a tadpole. Im assuming with a good idler pulley my chain ring wont matter as much? Sounds like it would be easier to just put a SA 3spd hub in the rear to get my 2 front gears back. I was only asking about getting back my bigger front gear back with a hub in the back for gearing.

 

[Kepler]

Being a tadpole is a different story. With the long chain and good idler pulley, it would be very like likely you could get a 3 speed front derailleur to work effectively.

 

[m4s73r]

Being a tadpole is a different story. With the long chain and good idler pulley, it would be very like likely you could get a 3 speed front derailleur to work effectively.

Or even just a second bigger gear would be cool as well. adding a 56t would get me my speed back.

 

[Somebodystopme!!]

Hi,

I am looking for a reputable China online shop to buy Bafang BBS02 from. I know about greenbikekit and BMS battery, are they good? Any other good ones?

I just bought one from http://www.asian-resources.com. They are an ebay seller and have them there.
I believe they are also affiliated with hallomotor.com as well.

I contacted them through Ebay and bought a 48v 750w BBS02 for $485 shipped.

I'll post again when I receive it and tell what condition it's in.

I ordered it on Feb 3rd but they're at the tale end of there Chinese New Year so it will not start to processed until feb 8th or so. Then maybe a couple of weeks to California.

Just an update, I received this unit on February 17th. So far I'm very happy. It was extremely well packed when compared to my GNG kit I ordered from China. I hope to get it installed within the next few days.

 

[Kepler]

Very good. Did you order it with any custom programming?

I ordered another 3 units last week from Amy. All with speed limiter removed and LVC set to 40V. Also specified Black 961 displays. So far she has been very good. Hope it stays this way.

 

[Somebodystopme!!]

Very good. Did you order it with any custom programming?

I ordered another 3 units last week from Amy. All with speed limiter removed and LVC set to 40V. Also specified Black 961 displays. So far she has been very good. Hope it stays this way.

I ordered mine with the limiter removed as well. Didn't know I could order bit with a black face! Ggrrr.. Would've liked that.

 

[dirkdiggler]

Does Amy do the programming like Lecrewse with the 0 assist setting as full power throttle? Might be in interested in selling mine to get that option.