What sized tyres fit on a trek 6700?

Had a good days riding on Afan W2 trail yesterday. However the rocks had me wanting some tyres with a bit more air in them. Something like Maxxis high roller 2.35's. However, dont want to get £60 worth of tyres that don't fit.... I'm not too worried about mud clearance as it'll be for dry weather and trail centres, so anyone know if it'll fit?
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Google time....
Just wanting that fat rubber for the rocky stuff.
I used to have Nobby Nics 2.25 on my Trek 6500, and there was plenty of clearance.
Trek 1.5c