Originally Posted by
yangmusa
OK, I also didn't mean to imply there's any particular harm in running different tires, just that there's no particular benefit on a folding bike (that I can think of). So, ride with the tires you can find, and enjoy your bike
Mudguard Clearence may be a good reason.
A birdie with mud guards will take a big apple in 2 inch at the back with no problems even on thick mud. But even a 1.5 tyre will clog with mud at the front although a 2 inch bigapple fits without issues without mudguards.