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@Howard
Assuming you'll run 32mm cross noblies it's roughly the same GI. I'd go a bit longer - most of the circuits I've raced at have long drags at fairly high speeds.
Raced at Oxford yesterday in the end - what looked like a dull sports ground crit track turned out to be a wonderfully muddy swampy woodland / grass track mix. Ran challenge tubs at 20psi for the first time and was amazed by the level of grip and comfort they afforded.
Good to finally meet Ramaye too.