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Thanks everyone - have ordered 28mm GP4000's. Here's hoping they fit!
Just fitted some 28's to my commuter (from 23) does feel nicer shall compare times over a couple weeks see if I notice any difference.
On a side note has anyone tried making none tubeless road tyres tubeless? I'm unsure if I'm willing to experiment due to the high speeds you gain on a road bike!
Anecdotal - I built my new Mason up with Vittoria Corsa G+ in 28 flavour (on Hunt Wide rims) and I'm blown away by the performance. It took me a while to get used to the suppleness and the comfort of the Corsa's (carcass and increased dimensions) but now that I have I'm never going back. PS - I would happily race on them too, but perhaps increase the pressure to something like 90psi rather than the current 80psi. So far they have also help up well to our less than ideal Sussex road conditions and some London commuting
I use Conti GP4000s 23c that actually measure 25mm wide
I think there's almost as much variation in road bike tyre measuring as there is mountain. The 23 specialized tyres my old Roubaix came with were huge compared to the 23's I replaced them with (they were at least 25). Katie's got a set of Giant P-SL1 wheels/tyres on that are supposed to be 25 that measure as 26mm.
The Conti 4 Seasons 28s that I'm running at the moment measure at 28.
I run 28c Vittoria Zaffiro on mine, im sure they come up a little small tho, ive run 28c on all my bikes with real issues/disadvantages.
Mine is about 80% commuter.
I'll probably check out something bigger soon if these are measuring small as the road round here are awful along with the cycle path i ride.
I have a pair of box fresh 28c GP4000S if anyone is interested - no road bike now
Lol! Literally just fitted a set today 🙁
My hybrid has a cheap alu frame which is heavy, and steel project 2 forks. They are both really stiff though, and with the nice supple 32c tyres the bike is superb to ride.