Question on ACS Southpaw freewheel

[T.C. Mann]

The ACS Southpaw is available in both 14T and 16T. I know that the 16T one uses a 1.375 X 24TPI
Left-hand thread. Does anyone know if the 14T uses the same or different thread? I am asking this
because some of the LHD hubs state that they only work with the 14T Southpaw. I am thinking that
the 14T must use a different thread otherwise why wouldn't I be able to use a 16T Southpaw with
them? Thank you

 

[Sheldon Brown]

T.C. Mann wrote:

> The ACS Southpaw is available in both 14T and 16T. I know that the 16T one uses a 1.375 X 24TPI
> Left-hand thread. Does anyone know if the 14T uses the same or different thread? I am asking this
> because some of the LHD hubs state that they only work with the 14T Southpaw. I am thinking that
> the 14T must use a different thread otherwise why wouldn't I be able to use a 16T Southpaw with
> them? Thank you

All singlespeed 14 tooth freewheels need the smaller "metric" thread. The standard 1 3/8" thread
doesn't leave room to fit a freewheel mechanism inside of a 14 tooth sprocket.

This is true for both left- and right-side drive systems.

Sheldon "No Room For The Pawls" Brown
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shipped Worldwide http://captainbike.com http://sheldonbrown.com

 

[A Muzi]

"T.C. Mann" <[email protected]> wrote in message
news:[email protected]...
> The ACS Southpaw is available in both 14T and 16T. I know that the 16T one uses a 1.375 X 24TPI
> Left-hand thread. Does anyone know if the 14T uses the same or different thread? I am asking this
> because some of the LHD hubs state that they only work with the 14T Southpaw. I am thinking that
> the 14T must use a different thread otherwise why wouldn't I be able to use a 16T Southpaw with
> them? Thank you

I don't know about that freewheel specifically but the usual format is a standard thread on sizes
16-up. Because the freewheel mechanism requires at least _some_ space, the fourteens are threaded
for the smaller "mini" thread. I'm fairly certain that, left or right, there's not enough room
outside of a
1.37 thread for a fourteen freewheel.

--
Andrew Muzi http://www.yellowjersey.org Open every day since 1 April 1971