Then stick with 25mm (actual), as there's a chance your chainstay will get worn through due to tyres rubs and result in needing repair/new frames if using larger tyres.
Aye, I knew what the answer was before I asked really!
Still can't decide gp5000 or Corsa g+ mind.
Corsa G+ are lovely tyres and come up pretty close to claimed sizes (esp. on wide rims, mine came up to 26mm
@dglshrn started
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Then stick with 25mm (actual), as there's a chance your chainstay will get worn through due to tyres rubs and result in needing repair/new frames if using larger tyres.