The C model has a subframe that is rated for some minimal weight in the range of 6 kgs or something like that. Along with a smaller tank (14 litres?) it has a different rear sub frame structure than the A model, which is sold in North America (and also Australia in more recent years).
The concern is that if you attach a rear luggage system with rack and bags that attach to the rear subframe like most standard systems do, your subframe will eventually crack and break. I've got a nice photo of my friends rear bags dragging on the ground after he found this out the hard way.
The solution for this is to either not carry any rear luggage (which is fine for short trips) or to make sure that your rear luggage rack connects to the main frame as opposed to the sub frame. This isn't too hard to do as the C model doesn't have any off the rack luggage solutions so if you want to outfit it, you have to build your own rack design anyway.
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