Anyone running 40mm tires on 25 internal rims? What do they actually measure?

[Tommasini53]

40mm Schwalbe G-one Speed; Campy Levante wheels (25mm) measure out at 40.5mm.

[Will_Elder]

Originally Posted by makoti

Perfect.
How do you like those tires? Anything to compare them to? My only gravel tire experience is the GK's SS+.

Sorry this is my first gravel bike, so nothing to compare to. First spin yesterday was a lot of fun!