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@FatManOnAFixie
News from the front! Witness cutting-edge measurements being taken post-sarnie....
OK, never assume all the information you're given is correct. This includes me!
After a chat with the original owner things are beginning to unravel a bit. It turns out there WERE chaintugs/adjusters but he found them 'fiddly' so just binned them (!) when the original wheel broke....as a result when he replaced the rear wheel he found the wheel would slide forward when peddling hard. It was then that he asked me to have a look a few years ago which resulted in me fitting a series of washers to keep the stays parallel. aha!
Look what the frame spacing is when the rear wheel has been removed...
So, lets go back and measure the OLD of the rear wheel the original owner used as a replacement...
Aaaah! Thats where the missing 5mm went which resulted in me suppling washers to make up the gap.
Original owner also confirmed this bike never had gears ever, and the BB is original, he bought it from Halfords new and its never been in a bike shop so its as was supplied excepting the rear wheel.
The Chainring and guard are located correctly (or at least as it came from Halfords) so I'm beginning to think that either Carrera did use a wider hub to get the chainline closer to to the 49-50mm or so I read at the BB... OR maybe..... they just didn't bother as Mr Suffolk suggests.
I've got a hefty clearance betwixt chainring and stay... observe...
and even more betwixt pedal crank and stay...
So, if a I purchase a new 120mm O.L.D. Flip Flop wheel and chain tugs at least it'll give me a 42mm chainline to aim for at the front by using stackbolt spacers (I think thats their correct name yeah?) to get the chainring in closer to the frame which it can take.
Sound like a plan?