https://www.stellamodels.com.hk/trac...su-p-8494.html Here are the 30mm version.
https://www.stellamodels.com.hk/alum...u-p-10503.html Here's a good profile view of a typical rim for this type of tire. When I measure the stock Tamiya rims I get 47mm outer diameter and 44mm in the valleys on both sides where the tire rests. Maybe it would be a good idea to buy a set of cheap Tamiya rims for measurements.
https://www.stellamodels.com.hk/5654...a-p-10104.html and
https://www.stellamodels.com.hk/5654...a-p-10106.html