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@smiff
don't be fooled by the profile, chingford has various surfaces so it is not all about the fast tarmac blasting (although there are some awsome sections of that). let some air out your tyres too. i would say sub 100 is best (i didn't and 120 was too high),
i rode 48x19 (GG / GoC) and it was sweeeeet. that's about 67GI.
enjoy!