Slick tyres and skid risk: is this true?

[reohn2]

GP4S are only available up to 28mm?

They've recently become available in 32

https://www.continental-tires.com/bicyc ... x-4-season

What is their actual size?
Both Conti and Schwalbe are notorious for coming up smaller than their stated sizes

[Gattonero]

GP4S are only available up to 28mm?

They've recently become available in 32

https://www.continental-tires.com/bicyc ... x-4-season

Mind you, if fitted on those "new" (?) fashionable wide rims, a 28mm bumps up to 30mm real size

[Gattonero]

GP4S are only available up to 28mm?

They've recently become available in 32

https://www.continental-tires.com/bicyc ... x-4-season

What is their actual size?
Both Conti and Schwalbe are notorious for coming up smaller than their stated sizes

The GP 4season are a bit strange, the 23 and 28mm are true to size, the 25mm is more a 26mm.
All of them go up almost 2mm if fitted on a wide-ish rim, i.e. a GP 4season 23mm fitted on an Archetype rim becomes a 25mm, the 25mm goes easily to 28mm

[Vorpal]

My 28s used to run a bit on the small side, but the pair I've got on now are pretty close to 28 mm fitted.

[Scunnered]

Is there a forum favourite bigger (32-35mm) tyre for autumn/winter use? Ideally something less tractor-like than Marathons; I normally run 35mm Hyper Voyagers, but am not a huge fan of them in the wet or on skoggy surfaces. Grip and comfort important, speed a little less, cost I'm less fussed about if they're good. AIUI GP4S are only available up to 28mm?

I'm using Specialized Roubaix Pro this autumn/winter. Claimed size is 30/32 but actually measure 34mm on 19mm internal rims. Comfortable, low rolling resistance and good grip (better than Hypers). I am running them tubeless, but you don't have to.