May we see the torque/speed, efficiency/speed, and mechanical power/speed curves for these motors, please?
My bike has a 750 watt bafang BBS02 it should be beat by a 1000 watt geared hub bike. But I would still bet $5 on winning.
You're bike looks awesome and if you're having fun than that's all that matters.
Bosch does not really publish much info. but you can read how people get 50 to 100 miles on a 640 watt 36v battery. my riding at 18mph on a flat I would get around 50 miles on a single battery. it depend on how much you ride and how many hills you climb and how far you want to be able to travel on your battery.
You can use the Grin Tech motor simulator to cook up just about whatever you want. It is widely recognized as being pretty much dead-on accurate in builder circles.
ebikes.ca
your starting to get silly. but it does not feel like a regular bike unless it has a torque sensor.
Some great posts, but now don’t be a one bike wonder (expert).
It does have a torque sensor.
Fair enough. Based on the things I've learned here, I'll definitely try a mid-drive someday. Maybe you guys could teach me how to talk my wife into it.
Both would be good with the right tires.
The Christini system is not quite what a lot of people think it is. It is not two wheels powered at once. There is a slight gearing differential - I think its like 97%. Maybe 95%. That keeps the front wheel from being actively powered. If the rear wheel slips, the front wheel takes over and pulls you out of your slide. When the rear stops slipping, it automatically shifts back to being primary. Its a subtle but significant difference. You aren't looking at more power so much as you are looking at it shifting fore and aft, as needed in the moment. He was interviewed on the Area 13 podcast awhile back after meeting the shop owner at Sea Otter. Its worth a listen if you want more on that concept.
talesontwowheels.com
You're happy. Enjoy your ride. You can't miss something you don't need. If my first bike was a hub drive I may never have moved on. As it's panned outI really don't need a mid-drive. But I ended up selling supporting and building with them. But have gone back to hub drives. Sadly, especially for my wallet, I like it ALL. Rear, front, direct drive, gear drive, and, mid drives. As the song goes, Love The One You're With
BBSHD or any high-power Bafang mid with fat tires. Says he who rides all winter in Minnesnowta.
Thanks! Will definitely play around with the Grin simulator. Interesting bike and tuning challenge you have there.You can use the Grin Tech motor simulator to cook up just about whatever you want. It is widely recognized as being pretty much dead-on accurate in builder circles.
Motor Simulator - Tools
Our ebike motor simulator allows you to easily simulate the different performance characteristics of different ebike setups - with a wide selection of hub motors modeled, and the ability to add custom batteries and controllers and set a wide variety of vehicle parameters you'll be able to see...
You'll want to look down the left side where the parameters are and choose Open System B to give yourself a direct comparison on one screen.
In builder circles, its generally accepted that mids are more efficient than hubs in terms of the power they eat. Recently I have been playing around with efficiency on very long hauls on my 2wd cargo bike, where I have a front hub and a rear mid. Just in looking at the amps and watts needed for the two motors individually as I toodle down a long, flat straight stretch of road, I've been playing with balancing the output between front and back to improve range. Looking at the outputs, I've been reminded of how mids sip power at cruise as well as under pedal assist. However, you can tuirn this on its head by hammering the throttle, or even using the factory programming and not rolling your own that is aimed at converting electricity to forward motion and minimizing how much is instead converted to heat.
I haven't been in this thread for awhile... and after a quick perusal of the last few pages it looks like the bars have emptied out, the moon is full and not everyone has stayed on their meds.
Very impressive ebike and outfit in that photo. You've clearly been at this a while. Will be spending some time on your site.Dual Motor AWD Electric Bikes – Case Study: Fat Trail and Hill Climber
Built to conquer the weakness of twin hubs in hills – and eliminate the damage a mid drive does to an ebike’s drivetrain. The bike I call 2Fat did all that.
