Tyre* Size vs Rim Size Advice

[rgcrgc]

*Tire if you must but (a) personally I'm quite awake and not tired, and (b) we are not American

Firstly. I'm staggered the last post i this sub-forum was me, 9 months ago. OK, that dispensed with, here is my current conundrum...

...my new-ish bike came, ex-factory, with Alexrims DC19 wheels (ETRTO 622-16) coupled with 622-42 tyres. Recently I have been experiencing a bunch of pinch flats with the puncture rim-side. Rim tape looks OK (but I will replace just in case) but that's not my question. I'm wondering if the tyre is a bit oversized for the rim and, therefore, so is the inner tube. I've checked on teh intahwebz but there is no real consensus (possibly because 622-16 is not a standard rim size). So questions...

...is a 622-42 tyre too much for a 622-16 rim?
if no, is there a trick for seating the tube properly?
If yes, what would be the biggest tyre I could get away with on that rim?

Cheers

[Frosty]

Hi rgcrgc,
Can't help you with your tyre dilemma but your signature is interesting.

My hovering ship is full of eels

Frosty.