We’re not talking about 40mm tyres on 40mm rims.
But why not.
lol i run nearly that combo. 38mm schwalbe g-ones on a lb wr38 rim which is 25 internal, 32 external, and 38mm deep.
TBF it is 25mm internal, rather than 38mm internal (!!)
I've run 32 on 25 internal, would I run 28 on them. Probably give it a whirl. I bottled it on getting 30 or 35 internal for my 650b set as 25 was cheaper. But tire wise for off road I'm currently at wider is better mental space.
@zmjones_ started
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But why not.