Who is this colin providing additional 349mm rims?
Be careful with your setup, you have probably an additional 8 kg all on the front of your bike. The hinge does not bear that well all this additional weight and may bend slightly over time.
It happened to my brompton and my heavy battery pack, now it's not that easy to fold
I have 7,500 miles on my Brompton now with an extra 11kg on the front. Nothing bent, broken or damaged so far.
I have seen hugely fat people riding Bromptons which would have far more weight on the front forks than mine does with its extra 11kg. It also therefore depends how heavy you are to start with.