I am taking my AF to Europe in September where I know (from hard experience) that spare 20" tires and tubes are hard to find.
I want to be prepared with a pair of spare tires and about a dozen spare tubes.
I'd like to know the best tire size choice for this bike. I am confused between 406 and 451.
(I currently have 451 Stelvios on my CR18 rims. But I am not sure those are the original spec for the bike - I am inquiring of Green Gear.)
Can anyone guide me?