Can’t recall actual size but I have a Hope QR seatpost clamp for a 31.6 post – might be 34.9.
Now got a Reverb so don’t need the QR lever – is the main alu part the same for both pinch bolt (what I need) and the QR – can I get replacement bolt/brass saddle or cheaper to replace the whole thing (not Hope)?

Or does anyone want to swap a very good condition silver QR for a pinch-bolt version (no horrid colours)?

Cheers

Pretty sure the collar is common, but not sure if you can buy the bits to swap between them.
But, best to drop Hope an email and see what they say. They might sell you the bits for a few quid…?

Ukbikestore. About £5-6.

http://www.ukbikestore.co.uk/product/407/scsp001/hope-seat-clamp-qr-to-bolted-conversion-kit.html