Followup on https://www.johnnynerdout.com/forum/general-ebike-forum/commuter-bike-for-all-season-riding-suggesions , i finally bit the bullet and ordered all the parts from the goldenmotor.bike .
Got BBS02 500W + 36v 14ah Shark Pack + C961 display + gear sensor + install tool.
I also ordered separate break sensor cut offs (with magnets) on amazon, because I have integrated shifters/brake levers. I used the supplied brake lever for the front brake and the old shifter/brake lever + magnetic sensor for the rear brake. I applied dielectric grease on all connectors and covered them with a double-wall shrink tube with adhesive (in preparation for riding in the winter).
Issues encountered:
- To install the drive I had to completely remove cables for front and real derailer and route the cable for the rear derailer along top of the frame, close to the rear brake cable.
- The geometry of the frame allowed installing the drive, but there was almost no freedom of rotating it to increase road clearance.
- I also decided to upgrade my front and rear fenders, unfortunately the front bolt is completely rusted so I was not able to remove it yet. Which means that I could not mount the light that came with the kit
- Another issue was that the drive has bullet battery connector, but the battery pack uses Anderson. The pack also included two pig tails with anderson connectors, so I suppose the right solution would be to cut away the bullet connectros and solder the pigtails, but i didn't do it yet. Right now it's just crimped together and held by shrink tubes.
- Cable management is a bit ugly at the moment.
Performance:
The top speed I was able to achieve on motor only using highest gear depends on the power assist, so for 1st level it's about 25kmh, 2nd level ~ 32kmh and 3rd level ~ 40kmh.
Pulling a trailer with a baby worked fine. Didn't try to go on the top speed in this mode, but it quickly reaches 25kmh.
Observations:
- i made a mistake of reusing an old pin on the chain, after I broke it to remove the front derailer - it was a mistake, it lasted for ~ 10km, and then chain broke under load. Nothing dramatic happen, fortunately I was near home. Replaced the chain with a new one.
- the cap for the "water proof" connector for the speed sensor was installed in reverse, so completely useless - just using shrink wrap with adhesive to hold it all together - shifting to the lowest gear (largest cog) is not reliable, maybe because of the chain-line or because i need to adjust my derailer.
- the clearance between the edge of the battery and the front chain ring is quite small, so if I decide to go for lekkie chain ring to improve switching to the lower gear, I might have to relocate battery higher, but there is no mounts high enough on the frame to fasten it.
are you sure that that is a 36V motor? My BBS02 is 750 watts and 48V.
I wouldn't worry too much about the motor hanging down. My old Trek f/s is worse than yours. Just don't go bashing over curbs or rocks. (I don't think you are going to be riding any mountain trails w/ THAT bike😀
The bolt? Get som penetrating oil and a pair of vise grips, and a hammer if necessary. OR if the bolt head is still intact try a socket (and oil) with an impact driver or hammer drill. The rotational-banging really helps (but, may twist the head off). Then you have to drill it out. But there's no way around it.
Yeah do the connectors right. Bullet connectors don't really carry that much current and the mor connectors- the more trouble. Plus, you want a clean look.
I would be mostly concerned with your stock brakes. COMPLETELY inadequate for a powered bike, ESPECIALLY if you are towing a baby cart.
Your performance sounds reasonable. Your derailleur needs adjustment, probably. Lots of Utube vids on that and it's pretty easy without having a front derailleur in the mix. Or it may be worthwhile for you to hire a pro to tweak and look it over. Especially if you have a little one in tow.