Gazelle Formula Trim - Front Mech clamp size?

[speedingsnake]

Hi guys,

I've measured my Gazelle by eye with a stiff tape measure, which is not as easy as you'd think it'd be.

I am 85% certain it requires a 31.8mm clamp.

Can anyone confirm for certain?

To clarify, it is a 1990s Gazelle Formula Trim 501 Reynolds, no idea how to further specify its model but can do if you tell me how!

 

[daccordimark]

I would be very surprised if it was anything other 28.6mm on 501 road tubing.

Mark.