Brakeless gear hubs

Adam Rush said:

When a gear hub is manufactured without a coaster or drum
brake, what is it usually made to do when back-pedalled?
Does it freewheel for all eternity or does it go a few
rotations before going no further?

Usually freewheels for all eternity; at least, that's what
Sturmey-Archer ones do.

On 9 May 2004 05:11:02 -0700, [email hidden] (Adam Rush) may have

Quoted message said:

When a gear hub is manufactured without a coaster or drum
brake, what is it usually made to do when back-pedalled?
Does it freewheel for all eternity or does it go a few
rotations before going no further?

All of the Sturmey-Archer, Shimano and Sachs non-coaster
gear hubs of my experience simply freewheel if back-
pedalled. If there's no coaster brake, the freewheeling
sprocket on the hub should not care whether the speed
mismatch is due to backpedalling or not pedalling; it will
simply ratchet freely in either case.

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Quoted message said:

Adam Rush said:

When a gear hub is manufactured without a coaster or
drum brake, what is it usually made to do when back-
pedalled? Does it freewheel for all eternity or does it
go a few rotations before going no further?

Usually freewheels for all eternity; at least, that's what
Sturmey-Archer ones do.

Where I live, "Sturmey-Arch" is translated to "Sachs."
Anybody with info on the Dreigang?

Adam Rush said:

When a gear hub is manufactured without a coaster or drum
brake, what is it usually made to do when back-pedalled?
Does it freewheel for all eternity or does it go a few
rotations before going no further?

Single and multiple speed hubs with no backpedal brake just
coast. You may indeed backpedal forever just as you could
with a Record cassette hub. Or a freewheel hub. Or a Profile
Racing flatland single speed hub. Hubs which allow coasting
by one means or another incorporate a one-way device which
engages the hub shell when pedaling forward. That mechanism,
usually a pawl in a ratchet ring, just does not engage the
other direction

Coaster ( backpedal) brake hubs have two mechanisms, one to
engage and drive the hub shell (for example, a clutch that's
pulled tight against the hub shell or a series of rollers
which run up ramps and jam against the hub shell) and
another to press a stationary component against a moving one
to provide braking ( either an expanding cylinder against
the hub shell or a series of discs engaged alternately to
the hub and axle which all press together or some such). The
default position, achieved by turning the hub but not one's
pedals, is disengagement of both mechanisms.

Andrew Muzi www.yellowjersey.org Open every day since 1
April, 1971