Single sided hub gear

Alan Braggins said:

Every now and again the subject of why single sided "forks" are good
comes up, often with an observation that it would be nice if there was
such a thing as a hub gear usable in a single sided rear wheel, and
that such a bike ought to have an integrated structural chaincase.

http://www.cyclelicio.us/2007/08/cannondale-folding-bicycle.html

It's a prototype with a modified 9 speed SRAM iMotion hub (and "Righty"
front fork), but allegedly might go into production depending on dealer
reaction.

Many more details including sketch of (not especially compact) fold at

<http://www.cannondalecommunity.com/default.asp?item=272389>

cheers,

Finlay

in message <[email hidden]>, Alan Braggins

(') said:

Every now and again the subject of why single sided "forks" are good
comes up, often with an observation that it would be nice if there was
such a thing as a hub gear usable in a single sided rear wheel, and
that such a bike ought to have an integrated structural chaincase.

http://www.cyclelicio.us/2007/08/cannondale-folding-bicycle.html

It's a prototype with a modified 9 speed SRAM iMotion hub (and "Righty"
front fork), but allegedly might go into production depending on dealer
reaction.

I've been saying this for a while: that's the future. Totally enclosed
drive chain running inside a structural monoblade. The only ways in which
this fails to love up to what I've been proposing is that the wheels
aren't interchangeable, and that the brakes are mounted directly on the
wheels, not on inner hubs.

Easier to change tyres; easier to change/fit/remove wheels; brakes aren't
affected by replacement of wheel; clean to ride; extended transmission
life/longer service interval/less risk of transmission damage; potentially
significantly lighter because you lose a lot of redundant structure.

--
[email hidden] (Simon Brooke) http://www.jasmine.org.uk/~simon/

;; If you're doing this for fun, do what seems fun. If you're
;; doing it for money, stop now.
;; Rainer Deyke

Simon Brooke <[email hidden]> wrote in
news:[email hidden]:

Quoted message said:

in message <[email hidden]>, Alan Braggins

(') said:

Every now and again the subject of why single sided "forks" are good
comes up, often with an observation that it would be nice if there
was such a thing as a hub gear usable in a single sided rear wheel,
and that such a bike ought to have an integrated structural
chaincase.

http://www.cyclelicio.us/2007/08/cannondale-folding-bicycle.html

It's a prototype with a modified 9 speed SRAM iMotion hub (and
"Righty" front fork), but allegedly might go into production
depending on dealer reaction.

I've been saying this for a while: that's the future. Totally enclosed
drive chain running inside a structural monoblade. The only ways in
which this fails to love up to what I've been proposing is that the
wheels aren't interchangeable, and that the brakes are mounted
directly on the wheels, not on inner hubs.

Or use a carbon fibre drive belt instead:
http://www.bikebiz.com/news/28798/Carbon-belt-drive-is-future-for-bike-
transmission

--
Tony

" I would never die for my beliefs because I might be wrong."
Bertrand Russell

In article said:

Quoted message said:

It's a prototype with a modified 9 speed SRAM iMotion hub (and "Righty"
front fork), but allegedly might go into production depending on dealer
reaction.

I've been saying this for a while: that's the future.

I immediately thought of you when I saw it.

Quoted message said:

Totally enclosed
drive chain running inside a structural monoblade. The only ways in which
this fails to love up to what I've been proposing is that the wheels
aren't interchangeable, and that the brakes are mounted directly on the
wheels, not on inner hubs.

Velovision has an update with more details from Cannondale's lead engineer
on the project:
http://www.velovision.co.uk/cgi-bin/show_comments.pl?storynum=877

The Greenspeed Anura apparently lets you take off the back wheels
leaving the brakes in place, but that doesn't have hub gears to
worry about. Add a G-Boxx style gearbox to the enclosed drivechain
so it isn't removed when the wheel is, so the wheels can be interchangable
without the front hub having to be big enough to fit hub gears in?

in message <[email hidden]>, Alan Braggins

(') said:

In article <[email hidden]>, Simon

Brooke said:

Quoted message said:

It's a prototype with a modified 9 speed SRAM iMotion hub (and "Righty"
front fork), but allegedly might go into production depending on dealer
reaction.

I've been saying this for a while: that's the future.

I immediately thought of you when I saw it.

Quoted message said:

Totally enclosed
drive chain running inside a structural monoblade. The only ways in which
this fails to love up to what I've been proposing is that the wheels
aren't interchangeable, and that the brakes are mounted directly on the
wheels, not on inner hubs.

Velovision has an update with more details from Cannondale's lead
engineer on the project:
http://www.velovision.co.uk/cgi-bin/show_comments.pl?storynum=877

The Greenspeed Anura apparently lets you take off the back wheels
leaving the brakes in place, but that doesn't have hub gears to
worry about. Add a G-Boxx style gearbox to the enclosed drivechain
so it isn't removed when the wheel is, so the wheels can be
interchangable without the front hub having to be big enough to fit hub
gears in?

Yup, exactly. Or a sort of super-Schlumpf - an 8 or 14 speed epicyclic
built into an oversize bottom bracket housing. The primary chain drive of
the GBoxx system is wasteful of efficiency.

--
[email hidden] (Simon Brooke) http://www.jasmine.org.uk/~simon/

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