Anyone know what thread an Old School Simplex Gear Hanger might contain?
I am talking 'clock spring' style changes here.
Simplex gear hanger thread.
Re: Simplex gear hanger thread.
this sort?
I don't remember offhand, and don't have one to measure, either. But being French I have always assumed it would be a metric thread, maybe with a 1mm pitch? Does a M6x1 bolt 'nestle' alongside the mech bolt nicely? If so any smaller diameter 1mm pitch tap can be used as a 'scraper' to clean up a manky thread, might this approach be helpful?
cheers
I don't remember offhand, and don't have one to measure, either. But being French I have always assumed it would be a metric thread, maybe with a 1mm pitch? Does a M6x1 bolt 'nestle' alongside the mech bolt nicely? If so any smaller diameter 1mm pitch tap can be used as a 'scraper' to clean up a manky thread, might this approach be helpful?
cheers
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~
~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~
Re: Simplex gear hanger thread.
Try asking on Tonton Velo Forum, the French veteran cycle site, I use Google Translate and they seem to understand me!
Re: Simplex gear hanger thread.
I thought simplex gear hangers were plain holes no thread nor tab like this one.
- download (2).jpg (10.35 KiB) Viewed 263 times
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Re: Simplex gear hanger thread.
for simplex parallelogram mechs, that is largely true. However for earlier ones, it isn't. In the 1970s they made dropouts that looked like the one above, and worked the same way when a simplex mech was attached to it, but the hole also had a 10mm x26tpi thread in it and there was a conventional tab too, so a campag, suntour or shimano mech could be fitted instead.
FWIW I have a late 1950's bike with 'agrati' dropouts in it and the gear hanger is tapped with a larger diameter thread than normal, and looks like it has always been this way. I never have been able to figure out which mech is meant to fit on it.
cheers
FWIW I have a late 1950's bike with 'agrati' dropouts in it and the gear hanger is tapped with a larger diameter thread than normal, and looks like it has always been this way. I never have been able to figure out which mech is meant to fit on it.
cheers
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~
~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~
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thirdcrank
- Posts: 36740
- Joined: 9 Jan 2007, 2:44pm
Re: Simplex gear hanger thread.
rjb wrote:I thought simplex gear hangers were plain holes no thread nor tab like this one.
download (2).jpg
That's pretty much what I thought but I didn't trust my memory enough to stick my neck out. I had to saw one off to fit a later mech (Juy Record 60?) when Simplex had changed to what I think of as Campag standards. Also going from distant memories the D/T bosses for the older type Simplex levers, which had a much bigger pulley diameter, wouldn't take the newer-style levers.
PS Among all the excellent features in the ad, one real sickener was that a broken gear cable meant the mech changed into the spokes.