Re: Why not comfort bikes?
Posted: Nov 14 2019 12:59am
Well for mainly dirt / gravel desert & forestry tracks I just can't see going that small.neptronix wrote: i only build bikes with 22" wheels or smaller these days
Fattie tires is suspension, so maybe 24" rim, gets to what circumference?
And I fully agree with "comfort bike platform" as opposed to the usual competition MTB or road bike frames in the US.
But as stated need to be able to stand on the pedals, any recumbency is a non-starter, not included in **my** definition of "comfort bike"
And I'm including big cahuna DD in my plans, in fact the main driver most of the time.
Just with heavy loads and big hills, see the need for a motor using gearing **as well** to help with slow speed high torque, since I **can't** get down too small a wheel, and even a 4000W DD chokes at those low speeds.
The CA v3 is indeed there to prevent damage only, up to me to be conservative to stop, get out, empty the water jugs maybe push the rig up to the top of the pass.
From here it seems going to the extra cost / complexity of multiple motors is worth it, probably an ICE motor is the only alternative.
> This is a 30mm wide DD ( 14-15lbs ) in a 20" wheel in a semi recumbent frame going up a 10% grade for 11 minutes straight. That's a pretty hardcore climb, and probably beyond what you're trying to do.
Not at all, and I'm hoping to get to at least 400lbs as well.
> you rarely see rear suspension on those kinds of bikes, which you really need, since more of the weight sits on the back of the bike than usual
Have not decided yet where the cargo / big battery pack(s) get distributed, with a front DD obviously would need to load up at that end.
A Rohloff Speedhub optimized for the lowest end is prolly a folly, 130 Nm limit I've heard?
Is there a mid BB drive that gets up to higher torque than that, could be derated for headroom with CAv3?