600/650x19 Race Valved Inner Tube
600/650x19. A Blockley metal stemmed(nickel plated) thick butyl inner tube for the 600 and 650 section 19" tyres.
We use this inner tube size with our Blockley 600x19 tyres (marked "550/600x19")
Note this tube is not marked for 18" as other brands. For 18" we have a different tube. This shows why there are so many actual Blockley tube sizes, rather than a few tubes with plenty of sizes written on them! You cannot buy a better tube.
Remember if you have a tyre marked 550/600 it will be a 600x19, so this tube is suitable.