My Syrian has the Senior Wodent wheel, which she really seems to really enjoy, and she doesn't arch her back at all which is great; only thing is, check there's enough height in the cage for it first, it's quite a size.
20cm/8" is the minimum for a Syrian, if you can go bigger, do. (My dwarf has a Junior.)
A little bit of olive oil on the wheel's axle keeps them running silent.