Bafang BBSHD 1000W Mid Drive Kit
(Bottom Bracket Size: 68-73mm (Standard), Chain Ring: Stock 46T Steel Chain Ring,
Luna Aluminum Chain Ring Adapter With 42T Sprocket $40.00,
Display Options: C965,
Bafang BBSxx Universal Thumb Throttle,
Bafang Handles with Built-in Ebrake cut off,
Shark 52v PF 11.5ah $439.95,
52v 3amp Lithium Charger $30.00
| Used 2009 Rockhopper 29er from Craigslist | 250 |
| BBSHD 1000w mid-drive kit | 669 |
| Luna Cycle chain ring | 40 |
| Shark 52v PF 11.5ah | 440 |
| 3amp charger | 30 |
| Shipping | 60 |
| Total Cost (not including special tools) | 1489 |
Summary:
The total build time was about 4 hours over a couple of days. Most of the time was removing the existing parts from the donor bike. This was a great kit with everything needed included (except for zip-ties). I did have some existing tools such as hex wrenches, pedal wrenches and a chain brake. I also had to purchase some tools which I found through links in this forum and other forums. Total cost about $55.
- to tighten lock ring Park Tool HCW-5 Lock Ring Spanner
- for removal of Shimano bottom bracket. BIKEHAND Bike Bicycle Shimano Bottom Bracket Removal Remover Tool
- this was recommended in some forum to tighten the lock ring, but it doesn't work because it doesn't fit over the shaft, so I wouldn't recommend it. Park Tool 16 Notch Bottom Bracket Tool
- definitely need this to get crank/ pedals off Park Tool CWP-7 Compact Crank Puller
2 custom things I had to do on this bike.
- Because the chain stays jut out sharply (see the pics) I had to add a couple of the included spacer rings to keep the internal crank of the motor (on the drive side) from contacting the chain stay. If I didn't use the spacers the drive shaft would not have been able to be seated properly in the bottom bracket.
- The triangle on the Rockhopper is very small, and I was worried that the Shark Pack I bought would not fit. Luckily it just fits, but I did have to drill new wholes for the bottom bracket nuts as the existing ones where too low in the triangle to mount the battery holder. I bought rivnuts and affixed them using the method recommended by RJ The Bike Guy (thanks RJ!) rather than buying an expensive rivnut tool. I did use an angle drill (see the pics) to drill out the wholes for the rivnuts, but with some patience it could probably be done with a regular drill.
The bike was about 25 lbs without the kit and about 50 lbs after installation. With a 180 lb rider, it will do about 33 mph on the flat at full throttle. I get about 25-30 miles on a charge, but that's pushing the motor pretty hard (generally 3-7 PAS). I don't use my lowest 2 gears because the chain line is at quite an angle and I don't trust driving it like that. A lekkie bling ring might be a good option as it looks like it's fairly deeply dished and might line the chain up better.
that's about it. Here's a couple of video links:
short spin
commute to work
Attached Files