I’m so sorry, but I have to destroy your illusions:
The size 30-349 (16 x 1,20) will not fit a Strida 16" rim, equal if metal or plastic.
You need to observe primarily the ETRTO labeling; the size is misleading in this case!
All Strida 16 inch rims are intended for tire sizes like xx-305, xx-349 is definitely much too big.
Yes, really too bad
(But as always; there is a way…if you don’t care about costs and time…
All we need are two hubs, some spokes and two 349 rims )
Sure, you might try Black Jacks, but be prepared to expect mounting trouble: Problem with Big Apple 16"
The Strida’s original rims do not match (very good) to (extremely) wide tyres