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jono84
Antidotes
Hi Jono.
So head tube is 11cm exact, amount of steerer above the headset is 4cm exact, realistically doesn't leave a lot of room for extra spacers.
Head tube including headset top and bottom is 13.5cm.
For tyre clearance, 25c is definitely safe, 28c just about, depending on the tyre choice.
The downward slope on the TT is very slight, this isn't like a mash or a bro pro or anything, it actually took a few months of staring at it to notice.