But they’re the biggest wheels for sensible folders for motorhomes. You can get 24 or 26” wheel folders but they take up far more room. Both my folders (one ‘e’ one not) have 20” wheels and both are fine on tracks etc. They have Schwalbe tyres. They handle fine, though with e-bikes you need to be more careful on unmade surfaces. They’re not mountain bikes, but they’re fine on bridle paths, tracks, old railways, tow paths, fields etc. I prefer riding my Trek hybrid with 26” wheels but I can’t carry it in my van.20 inch wheels are a little small for off roading