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So just to explain a bit more clearly:
I'm not set on upgrading for the 3mm difference, but just for better quality tyres. The Kenda Flintridge Sports it comes with apparently aren't great. I like the look of the Vredestein Aventura, and it comes in 38 or 44, and 44 won't fit, hence 38.
A 40mm would squeeze into this frame but I don't want to risk damaging it, so will try 38. I measured about 1cm clearance either side at the closest point, with the current 35 tyres, so should be about 8.5mm with 38mm.
The other option is the seemingly very popular Schwalbe G-One Allround, which does come in 35mm. Might get that later on - Want to try the Aventura first.
Not interested in modifying the frame in any way, or replacing it. Got a great deal, and would like to use it.
I found some options, although they might be a tight fit (I measured about 60mm space between the seat stays and fork, at the top edge of the tyre, but the Topeak says it needs 70mm):
https://www.topeak.com/global/en/product/1557-TETRAFENDER-G1-&-G2-SET
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sks edge 46?
currently on offer at spa
https://www.spacycles.co.uk/m19b0s80p5261/SKS-Edge-Aluminium-Mudguards-46mm
Maybe, but my bet is that you're still going to struggle with clearance at the chainstays. Idk about honjos or other alu ones, but GB aren't thinner than sks. I guess cutting the existing guards after the seat stay bridge would be an option. Or maybe even cutting the equivalent sections out of the sks guards to test it first? Or maybe cutting the seat stay bridge out?
TBH it sounds easier to get a new frame:
... for 3mm gain?