I guess it depends what the offset is and stud diametre. I believe its somethin like 100*4 and 38mm offset I maybe wrong. I have 15's on my and the tyres are like 195 50 15's so Id imagine simlilar to that
215/35x16 are 1.8% bigger than standard wheels and tyres, but will probably rub without arch work due to their width, 195/40x16 are 2.78% bigger than standard, the speedo will read 72 mph at a true 70mph not allowing for speedo accuracy, so they will probably run the correct speed taking inaccuracy into account, and they will fit into the arches even if lowered if the offset is right (around 38mm)
That sort of size alloy and tyre will slow your 1.0 down a fair bit though.
They're the correct stud pattern & offset so no worries there
Hmmm, I might rethink then. You think the effect on performance would be noticable? Enough to p*ss me off?
depending on the weight difference you will notice a fair difference on acceleration, you lose power trying to get the wheels moving, maybe only 1 or 2 seconds up to 70, you will probably lose about 10 - 15 mph from your top speed as well.