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The all weather uses plastic components in place of metal (still has metal rails), and has a woven polyester top rather than woven cotton - hopefully harder wearing. I’ve got a couple of each, using an all weather on my commuter at the moment not done enough miles on it to confirm increased durability.
The more recent batches of standard C17 seem to have extra coating of shiny stuff which is helping extend the wear.
Look at this bollocks! Just out of warranty too, only two years old. I mean I like a cream cake but I'm well within weight limits for the C17. Want another one but grudgingly, if this is what happens.