Hello,
I asked a similar question here:
http://www.hyundai-forums.com/t30053-bigge...ires-anyone.htmI called the Hyundai office in Sweden, and standard rims/wheels are 5" 14" (steel as well as alloy) with a offset/ ET 46. Standard tyre is 165/60 R14 in Sweden.
If you stick to the nearly the same size (height) of the wheel, you can instead use 185/50 R15, 195/45 R15 or 195/40 R16. This calls for a rim that is 6" -6.5".
Companies who sell tyres and wheels says that these sizes will fit the i10, and these rims have varios offset/ET: from 40 to 36.
Good luck and post pictures,
Best Regards,
Lars