There's a Rochet on CL in Detroit. Not mine, but I am acquainted with the shop owner. I have not seen the bike.
He didn't give a size, but gives here an asking price:
Late 50's ; Early 60's Rochet Touring bike.
Magnificent example....Original EVERYTHING but the tires/tubes and air.
Rochet pedals (pedal caps are intact)/Rochet Hubs/ Original Rims/ 4 matching correct wheel wingnuts.
Original LARGE Simplex Front Derailleur with lever shift.
Rear Huret derailleur. All generators/ lights are there with what looks like some of the original wire.
Even the rear Light/Reflector is there. Hand hammered Fish scale Fenders (aluminum) in Excellent shape.
Correct brake levers/ Pivo stem. Nice broken in Pryma Leather seat; post looks correct.
Decals in Very nice shape. 4 Speed rear cog. Mafac Brake calipers.
Price.................3500.00 Contact Brian, firstname.lastname@example.org, Bike Tech, Detroit, MI
Or find the CL ad and work through that.