Because you didn't change the drop out on the front.
Thereforth even with the same tyres size, a 28c will be quite close to the seat stay bridge whether the front will have enough gap to put your thumb inbetween the tyres and the fork crown.
It also mean you'll need two different brakes, a long reach front, and a short reach rear.
Because you didn't change the drop out on the front.
Thereforth even with the same tyres size, a 28c will be quite close to the seat stay bridge whether the front will have enough gap to put your thumb inbetween the tyres and the fork crown.
It also mean you'll need two different brakes, a long reach front, and a short reach rear.