Steel Soldiers now has a few new forums, read more about it at: New Munitions Forums!
Microsoft MSN, Live, Hotmail, Outlook email users may not be receiving emails. We are working to resolve this issue. Please add support@steelsoldiers.com to your trusted contacts.
Should be fine . Here a thread on it from 2015.
https://www.steelsoldiers.com/threads/m1101-02-trailers-i-need-to-change-the-wheels-and-need-the-exact-size.137316/
A few pictures with smaller tires in this thread : https://www.steelsoldiers.com/threads/m1102-spare-tire-search.158389/