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It'll do 28c GK's comfortably, not so sure about GP4000's.
Interestingly it's more roomy on the back than my sold similar vintage 8, i'll do a test later but i'm pretty confident i can get a 30c G-one in there. Annoyingly though the Ultra Slice forks max out at 28c. The Premium Slice forks on the 8 took a 30c G-one which would of been pretty handy on this frame if i wanted to go touring on it. If i get on with it i may upgrade to some SI/Premium forks that have a little more room but for now i'll stick with the Ultra's.
New 9.