Harv
4 8 15 16 23 42
Usually the tubes cover a range of tyres sizes. i.e. 700 x 18/25 which will cover your 700 x 23C tyres. Not sure what the stock tyres will be like on the bike. They may well do fine in the meantime, but by all means, if more puncture protection is wanted maybe try something like the Gatorskins.
Thanks Mo. Makes sense now you explain it. I was looking for an exact size.