so it helps to post your bike specs. i see its a hardtail, how many gears on the rear cassette? what is your main use case? mostly flat trails / commuting or do u need hill climbing power? lets put it this way, BBSHD is for if u really need power, climbing steep terrain. BBSO2 is when u dont need as much, still will climb fine but more suited for gradual trails / commuting. u save money and its also street legal most areas. for a bike of that value i do recommend the BBS02. but again lmk your use case n if u have other questions. pretty straightforward conversion it looks like for you

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Thanks for the help, Its nice to have a forum for the tips and tricks.🚲

Id say it depends sort of on your use case and whether you want to be abiding by regs where you are to hit the trails and everything a regular bike can. Id probably lean towards a BBS02 for a bike like that to play it safe, that motor still packs a punch and can hit that throttle when you need it. Chainline shouldnt be an issue just make sure theres a small gap to keep it off the chain stay.

As far as jerky behavior on the stock motor, youre going to want to reprogram the controller to a smooth operating profile, like em3ev black, with a few settings tweaks to match your battery and tire size. Mine was erratic and jerky, almost jarring to the drive train on the awful stock motor settings. Check out these guides (1st is best)

For example on a BBSHD I have the em3ev black profile loaded in the software, then I set the voltage cutoff for a 52v 20aH battery to 43V, 28 Amps max draw (max on new BBSHDs) Wheel size for 27.5" set to 700c. Other settings are similar to in the 2nd guide, (except my throttle is set to pas 8 or 9 for full power when its rarely needed). Set them appropriately, double check your settings are correct before writing the changes (recommend doing a file save (backup) of your stock profile before overwriting with a new one, and make sure to save the new one as well).

https://electricbike-blog.com/2015/06/26/a-hackers-guide-to-programming-the-bbs02/

https://edrivenet.com/bafang-programming/

Hi, I just put my kit on last night. And it's pretty crazy fast with the BBSHD. I've only ridden in for a few miles, but it was too much power past level 3 for me. The 46" chainring is a good size for top speed but makes getting off the starting line jerky. I don't have enough experience (obviously) to say get the BBS02. But I would be interested in maybe doing a light weight build with an 02 and a 10-13AH battery. Mine is a 48v 20AH and it's quite bulky and heavy. But I'm sure I'll appreciate it long term when I take longer rides. Chainline is an issue, I have the 46 stock ring (no spacers installed anywhere) and it clears my frame by 2mm (I got lucky). But the chainline to the large rear socket is still not very good. I would say the BBSHD 46T chainring (no spacers) sits approximately half way between the large and middle chainrings used to be (on a shimano MTB 3x setup) (if that makes sense). So I can get into the biggest rear cog, but, it's not great. I would be very interested to see where the stock BBS02 chainline sits vs. the BBSHD. I could guess that the BBS02 might be a better choice if you want a lighter system. The BBSHD seems geared for speed demons - but maybe i'm just not used to it yet. And of course it had to rain the first day after I built it.! My final bike weight with the BBSHD and a 20AH bat is 55lb (on a full sus AL frame) w/ 26"x2.3" tire.