Miche track cogs and carrier ISO or ITA? Does it matter?

[[email protected]]

Hi All,

I am contemplating cog choices for my current project. I want an 18
tooth 1/8" cog to thread onto my vintage Gipiemme hub. It has I presume
ITA threads, while all (to my knowledge) cogs available in 18T are ISO.
But what about the Miche? And does it matter anyway? I would kind of
like to use a Milwaukee as I am going to be getting a bunch of stuff
from Ben's anyway and they look pretty good to me.

Suggestions?

Thanks!

Joseph

 

[Qui si parla Campagnolo]

[email protected] wrote:
> Hi All,
>
> I am contemplating cog choices for my current project. I want an 18
> tooth 1/8" cog to thread onto my vintage Gipiemme hub. It has I presume
> ITA threads, while all (to my knowledge) cogs available in 18T are ISO.
> But what about the Miche? And does it matter anyway? I would kind of
> like to use a Milwaukee as I am going to be getting a bunch of stuff
> from Ben's anyway and they look pretty good to me.
>
> Suggestions?
>
> Thanks!
>
> Joseph

Threading on a ISO cog onto a ITL hub will essentially 'shape' the
threads so it will go on fine and stay tight. It will be a wee bit
draggy when ya thread it on but no worries..kinda like when ya thread
an Itl HS onto a BSC fork.

 

[* * Chas]

"Qui si parla Campagnolo" <[email protected]> wrote in message
news:[email protected]...
>
> [email protected] wrote:
> > Hi All,
> >
> > I am contemplating cog choices for my current project. I want an 18
> > tooth 1/8" cog to thread onto my vintage Gipiemme hub. It has I
presume
> > ITA threads, while all (to my knowledge) cogs available in 18T are
ISO.
> > But what about the Miche? And does it matter anyway? I would kind of
> > like to use a Milwaukee as I am going to be getting a bunch of stuff
> > from Ben's anyway and they look pretty good to me.
> >
> > Suggestions?
> >
> > Thanks!
> >
> > Joseph
>
> Threading on a ISO cog onto a ITL hub will essentially 'shape' the
> threads so it will go on fine and stay tight. It will be a wee bit
> draggy when ya thread it on but no worries..kinda like when ya thread
> an Itl HS onto a BSC fork.
>

"Diameters are specified in millimeters, but threads are in
threads-per-inch. In addition, the thread angle is 55 degrees, like the
obsolete British Whitworth system, rather than 60 degrees like U.S. and
metric threads. Italian freewheel (basically extinct) and headset
threads are the same as British/ISO, except for the thread angle
difference (55°)."

http://www.virtualitalia.com/sports/bike.shtml

http://www.sheldonbrown.com/gloss_i-k.html

Since Italian freewheels are "extinct" why would they continue to use
55° angle threads?

Chas.

 

[[email protected]]

* * Chas wrote:
<snip>

> Since Italian freewheels are "extinct" why would they continue to use
> 55° angle threads?

Because Fiat uses 4x98 instead of 4x100 bolt circle on their wheels?

Joseph

 

[* * Chas]

<[email protected]> wrote in message
news:[email protected]...

* * Chas wrote:
<snip>

> Since Italian freewheels are "extinct" why would they continue to use
> 55° angle threads?

Because Fiat uses 4x98 instead of 4x100 bolt circle on their wheels?

Joseph

Metric dimensioned inch sizes (except BB) with 55° inch pitch threads
and some speak so highly of the great Italian cyclyng components.

British Whitworth threads became obsolete i949 when the UK adopted the
Unified Thread system (slightly modified) along with the US.

http://www.enginehistory.org/british_fasteners.htm

So why did Italy adopt such a ******* system?

Chas.