Originally Posted by
WhyFi
Wait, wait -
Question: what size GP4K II were you running? The 5K are going to be narrower, like pretty much the equiv of one size smaller in a GP4k; they're being sized so that they're closer to nominal on modern, ~19mm rims. So if you were hoping for 23s, you're prolly in good shape with the 25s, but if you've been running 28s, the 25s would be really undersized.
I am running 23F 25R now, but the new wheels I ordered from PSIMET are modern/wider than what I have so I am expecting the 25's I ordered should be fine.