Chain line bbs02 1x11 speed DISASTER

[bobbacon]

Hello everybody. Huge headache here, just transferred my bbs02 to a new bike and the chain line is awful and my 32T aluminium chain ring is eaten up after just a few days. Running a 1x11 setup. I have an idea for a pulley wheel thing I saw someone posted on here somewhere, to correct the chain line, but will require some things I'd have to order, and not sure it'll be sufficient. Does anyone have experience with the stainless steel chain rings that are available online? Do they wear much less so that a crappy chain line is not as big of a problem?

Example chain ring here http://www.wolftoothcomponents.com/products/104-bcd-stainless-steel-chainrings
Even if this S/S chain ring wore ten times slower, at this rate I'm at now with the aluminium one it wouldn't be much better. Literally five days of riding, 2-3 hours a day and the teeth are shaved off like butter.. Any advice is much appreciated. I would like to not have to resort to angle grinding the bottom bracket, although I see that I could save probably 5 whole millimeter that way. Would like to be able to slap the manual cranks on if needed, should motor fail etc.

Cheers! Simon

My situation: http://imgur.com/a/4BDE2

 

[teslanv]

How about just a 7-speed with a really big tall gear?
I've never found a need for more than a few gears on a 750W mid drive. Really all you need is a really tall gear for climbing, a short gear (11T) for high Speed, and maybe 1-3 gears in the middle.
In fact, the Sturmey Archer 3-speed IGH is my new favorite set-up for a BBSxx system.

 

[Ykick]

What he said. 11 gears? That’s way too many and too busy IMO.

Here’s a good thread for working out a decent chain line and reasonable amount of gearing for BBSXX driven eBikes.

https://endless-sphere.com/forums/viewtopic.php?f=28&t=84097&hilit=cassette

I’m a fan of reorganizing cassette cogs for about 3 widely spaced ratios situated along a nice chain line and repurposing the 3 spd front shifter to select those 3 rear gears. I like my throttle on the right and usually never enough room for shifter and throttle on the same side.

 

[bobbacon]

How about just a 7-speed with a really big tall gear?
I've never found a need for more than a few gears on a 750W mid drive. Really all you need is a really tall gear for climbing, a short gear (11T) for high Speed, and maybe 1-3 gears in the middle.
In fact, the Sturmey Archer 3-speed IGH is my new favorite set-up for a BBSxx system.

Hi. I've got the 500W BBS02 so the need for gears is a little bit bigger than 750 or HD. I have to try and figure out how to use the existing drive train, as I can't spend money on another one. My previous bike had 7 speeds and 20" wheels, which was perfect, but the child in me craved more fun and I tried this setup.. Looking into using spacers to remove 3-4 gears. Not sure this is possible on this cassette, have no clue, have to do some research.

 

[bobbacon]

What he said. 11 gears? That’s way too many and too busy IMO.

Here’s a good thread for working out a decent chain line and reasonable amount of gearing for BBSXX driven eBikes.

https://endless-sphere.com/forums/viewtopic.php?f=28&t=84097&hilit=cassette

I’m a fan of reorganizing cassette cogs for about 3 widely spaced ratios situated along a nice chain line and repurposing the 3 spd front shifter to select those 3 rear gears. I like my throttle on the right and usually never enough room for shifter and throttle on the same side.

I'm looking into using spacers to lose a few cogs, 3-4, and get a better chainline. What do you mean by 3 widely spaced ratios? 3 gears?

 

[Ykick]

No need for spacers, just rearrange the needed cogs you want somewhere in the middle or wherever the chain line works best for your bike.

Here’s my 3 speeds 32-24-14 driven by 44T steel Bafang chain ring:

The unused inner/outer gears are simply spacers but the beauty is that you can play around for whatever 3 speeds work best for your situation. 750W or more really doesn't need many gears.

***EDIT*** Pardon me, didn't see your reply about 500W BBS02. My principle is the same, use 4 or 5 gears instead of 3. You still shouldn't need 11 as those 11 were probably designed for multiple front chain ring combinations and simply won't work with a single chain ring.

 

[2old]

I've been using three cogs, 11-17-28 with 8-speed spacing successfully on my BBS02 for a year. Spaced the gears so the 17 was "straight", then just have one click on either side. The Altus derailleur, shifter, and chain totalled about $40 on Amazon.

 

[bobbacon]

No need for spacers, just rearrange the needed cogs you want somewhere in the middle or wherever the chain line works best for your bike.

Here’s my 3 speeds 32-24-14 driven by 44T steel Bafang chain ring:

The unused inner/outer gears are simply spacers but the beauty is that you can play around for whatever 3 speeds work best for your situation. 750W or more really doesn't need many gears.

***EDIT*** Pardon me, didn't see your reply about 500W BBS02. My principle is the same, use 4 or 5 gears instead of 3. You still shouldn't need 11 as those 11 were probably designed for multiple front chain ring combinations and simply won't work with a single chain ring.

I managed to remove 3 out of 11 so now I have 8 speeds. I used 4 spacers I had lying around plus some of the unused cogs. I am in serious need of granny gear here where I live to not fry the controller, many hills are so steep most people wouldn't even try to go up in fear of falling backwards. I'm a lunatic and have strong legs so my 500w is enough, but I have 27.5" wheels with 2.4" tires so I need 42T in the back, to keep the RPM high. Only thing I have to do now is to set the limit screw so I can't overshift the 42T. My derailleur is totally new to me, SRAM NX, and I haven't figured out how it works yet. Truth be told I hate fiddling with the rear mech. The cassette is made to be run 1x11, no problem as long as the chain line is good, like with the original SRAM crank. Anyways, thanks for support, it made me try and remove those cogs and succeded.

 

[Ykick]

Right on Simon! Glad you found an improvement for your situation. You’re correct to spin these motors faster the better. In another discussion a user described it like a truck with small engine - needs that low range gearing.

And thanks for the kind words of my support but I can’t take credit for what I learned from the folks in that thread. Good stuff and what this place is best for.