Complete tyre size listing by rim size (2235 sizes)

16 inches - 213 tyres
17 inches - 278 tyres
18 inches - 271 tyres
19 inches - 256 tyres
20 inches - 224 tyres
21 inches - 82 tyres
23 inches - 1 tyres

Whilst these fitments are considered safe for the bikes listed, Regulations covering tyre usage vary depending on the Country of use.  It is always necessary to check that the fitment and combination of tyres is acceptable both for your bike and for the local Regulations.