Can anyone tell me the largest tire size that will work on a Silvio 2.0?
700 * 28 fits, with some filing (2 mm max) of the front and rear fork crowns to match the profile of the tyre, but with only 2 mm gap vertically, so mudguards need to stop at the fork crown.
If it is a late 2014 model, just before the S30 came out, then the 28 tyre could fit easily as the S30 will take a 700*32 tyre.