In article <
[email protected]>,
DougC <
[email protected]> wrote:
> Ryan Cousineau wrote:
> > ...
> > I saw a homebrew with a clever-looking mount: heavy-duty custom rack
> > carrying an electric motor directly above the rear wheel. Chain drive
> > from the motor down to the non-drive side of the hub, where there was a
> > second freewheel for the motor drive.
> >
> > I believe the rider was using a LHD BMX cog on the hub, and I assume
> > (with no certainty) he was using some flavor of flip-flop hub.
> >
>
> Did it really have freewheels on BOTH sides? Or just sprockets on both
> sides?... A number of kits use a chain drive on the left side, but the
> sprocket on the wheel is just bolted on, literally through the spokes.
> The engine drive side normally just spins all the time.
I dug up my photos to review the evidence. It's definitely a LHD
freewheel. Indeed, the drive side uses a multi-speed freewheel.
<http://www.flickr.com/photos/rcousine/2448067142/>
> There are people who use a disk brake hub, and bolt a sprocket to the
> disk mount. Also at least one company has made a double-drive hub, with
> the normal freewheel on the right and a bolted-on "stationary" sprocket
> on the left (Staton kits have these).
>
> Motorized-bike people have been wishing for a double-freewheel hub for a
> /long/ time, and I'd not heard of any in production. There are flip-flop
> BMX hubs that can take freewheels on both sides but I was informed
> (here, quite possibly) that the threading is the same direction on both
> sides--so the left side can't be used for driving, unless it's flipped
> over to the right.
Motorized bike people need to pay more attention to obscure BMX parts,
where the Left-Hand Drive exists:
<
https://www.jrbicycles.com/storefront/index.php?act=viewProd&productId=6
54>
The purpose of these off-side drives, aside from looking cool, is to let
riders who prefer to do coping grinds on the right-hand side to do so
unimpeded.
--
Ryan Cousineau
[email protected] http://www.wiredcola.com/
"In other newsgroups, they killfile trolls."
"In rec.bicycles.racing, we coach them."