Michael Cox wrote:I have been riding my BBS02 conversion for my daily commute for the past 15 months or so. I love it.
A few immediate thoughts based on what you have written above.
1) You want 30mph on the flat. It's not going to happen. The BBS02 has a drive motor rev limit, a bit faster than a human would comfortably peddle. It won't turn the front cog much faster than you can peddle it yourself. On a normal bike you may expect to hit 30mph on the flat BUT the BBS02 replaces the front 3 speed gears. The end result is you lose slightly on the gearing range available. Your top and bottom gearing ratios are not quite as high and low.
When the motor is not running you will find it more difficult to hill climb - eg with a flat battery - because you don't have a really low granny gear to work with. Not a problem when the motor is working.
I get 20mph using pedal assist on the flat, and 25mph on the flat using the throttle.
2) You NEED better brakes than the rim brakes. The bike is heavy, and you will end up going faster than you are used to. My conversion is based on a donor bike with disk brakes, and I am very grateful for them. Most of the time it would not be an issue, but I have to stop at the bottom of a couple of steep hills and I have had my fair share of idiot drivers cut me off.
3) Your battery sounds awesome. Mine is 48V and 12.5Ah. It get about 15 miles of max power/high speed on a daily basis. If i dial the pedal assist down I get much more range. I could probably nurse 40 miles out of it cruising at more like 12 to 15 mph. How are you planning on mounting the battery. Yours is likely to be twice as heavy as mine, mounted on the water bottle lugs on the frame. I'd be concerned about a heavier batter mounted the same way. Rear pannier frame?
4) You'll get hooked. I use mine year round in all weather. It replaces a car for us as family. You'll probably find you want to be able to eg pop to the shop and carrier bits and pieces. My pannier bags get daily use, and I'm thinking about a rear box as well, so I can get more stuff home.
Edward Norton wrote:Best of luck. Looks like you’ve done your research. I went through the same process as you wanting to upgrade my cargo bike. I have a Rad Runner, so know the joy of pedal assist.
For a long time, I was going to install the same mid drive that you’ve selected. My cousin has the same cargo bike as me and he’s going the befang route.
I chose a front hub as my cargo bike is my work horse and not for kicks, which is what you’ll be getting with your conversion. The front hub will just make it easier on the hills which is all I’m after. I have a good set of gears already.
You are right to get new cassette and chain. You might want to think about getting two of each though. Some bike parts are really hard to get hold of with current supply chain issues. A mid hub transfers way more force than the parts were originally designed for, so expect heavy wear and shorter life. Keeping your drive chain clean will help. I’d go as far as to pack a chain tool and spare chain on every ride.
Please keep us up to date with your transformation. Probably worth a few points towards the odd ball badge.