X2flier said:
Not sure what you think I am trying to do,
It sounded like you wanted the freewheel inside the BB shell, which is what that design I mentioned was trying to do (though I don't remember why).
but I want exactly the results that you describe, done exactly as you described it. Your links are helpful; I think I have a British ISO BB on my bike.
Then you probably already have square taper cranks, so all you need is a crank puller, available at just about any local bike shop, or online, so you can take the righthand crank off, and replace it with the threaded freewheel crank, after installing the freewheel and chainrings onto the crank.
(most likley also need a 15mm socket wrench or 6-7mm allen key to tighten the crank bolts after installing the new one, plus whatever tools to assemble the freewheel to the chainrings, and a box wrench to take the pedal off the old crank and put it on the new one).
If the crank is not the same length as your left crank, you'll probably want to change that one too, but 170mm is the common length for most cranks, including the FW ones I've seen (and the one I have here).
No need to change the BB itself out (whether cartridge or individual shaft, cups, and bearings).
The plan is this: I want to use a mid-drive motor (anything with a chain drive on the motor shaft, and a freewheel on the motor shaft). The motor turns the freewheeling chainrings though one of the chainrings. Motor power runs through the normal bike gears, to increase the hill-climbing ability and to lower the drain on the batteries. When I pedal, I will not be turning the motor (which has that separate freewheel on its' shaft). The motor can drive the chainrings, without the pedals moving.
Sounds like a typical middrive-thru-the-gears type. There's a lot of different types in various threads in the non-hub motor section if you need examples of mountings, motors, reductions, etc. Everything from DD and geared hubmotors (not in wheels) to RC motors and everything in between and outside those; chain and belt drives, etc.
I would certainly buy (not make) the threaded crank that I need. Got any sources?
None specific; I got mine from a member here that wasn't using it anymore.
Google shows a few
https://www.google.com/search?q=freewheel+crank+set&ie=utf-8&oe=utf-8
Sickbikeparts has been a common source for stuff here on the forum.
Sorry, maybe I missed something. What DOES a freewheel crank system fit into?
The one mentioned that was being designed just replaces the existing BB set, mounting into the BB shell exactly like the original, and then mount normal crank arms and stuff on it (though I think they might've been using ISIS cranks.
The standard ones are easier; they just mount onto the existing BB (usually square taper; the old standard like you probably have).
I think all my bike stuff comes from the last Ice Age. :lol: I'd sure need the square-tapered pedal cranks.
Everything I have is at least that old, too; I pickup things from Freecycle, Goodwill, and the like, and friends that dig things they figure they'll never use again out of garages and sheds.
Mostly I cut it up and build what I actually need and want out of them (cuz nobody makes that).
The illustration was not from a bike site, so they probably just missed the threaded part of the shaft, not for any good reason.
I suspect they just left it out of their CAD work for simplicity or laziness--most likely they used existing CAD models for regular cranks and other parts, and just sliced off or deleted teh polygons for the area where the threaded part would be, and didn't bother buildng the threaded area itself.
