Which Tyres?

Marathon Supreme

Or Michelin Pro4 Endurance V2 if you want the smaller side (700x28c)

They've been replaced by the Power which are meant to be just as tough but roll faster. Although it means you can now get the Endurance for cheaps.

When did that happen?! Apparently they aren't quite a direct replacement (check here), I'll try and pick up some cheap pro4s then.

Took the dive on the Marathon Supremes, were only £25 for one on eBay!

Seems to be "replaced by the Power which are meant to be not quite as tough and roll slightly slower..."

All at the extreme margin, of course.

I got some Grifos you can have cheep.

Doing Flanders in April. Can fit up to 30c

Challenge or gravel king? Tubeless?

I'll go with S-Ones

If I were to do flanders again and I would use the grippiest tyre I know of and that is not the S-ones. the cobbles of the Ronde de vlannderen are tame. My choice would be IRC RBCC tubeless.

If using tubes then Challange strada Bianca is what I did Paris Roubiax on. they are the best tubed clinchers I have ever tried. So comfy and robust.

Just go for the highest volume you can fit and use latex tubes.

the grippiest tyre I know of and that is not the S-ones.

As I was slightly surprised to discover yesterday as I sat on my arse in the middle of a roundabout.

Currently riding conti gp4000s 28, which measure at 31, so most 'normal 30c will fit I imagine.

Why not stick with the Contis?

Did Jake take these?

Lol no. The contis are great summer tires but they are never going to get me up a cobbled climb in April. Last year I rode Vittoria open paves, which were very grippy but very fragile

Not sure why you think Strada Biancas will be any better

They look more grippy than the contis and it's very difficult to buy open paves (since they stopped making them)

Had them in the past, those were great tyres, however cannot comment on their performance in the wet.

Have to says I been using GP4000sII as a winter tyres too, it work great in the winter as well, and reasonably tough (rode them in london's famous London).

He did, I'm afraid.

They will, I've used them for exactly this purpose.

60 miles on Compass Snoqualmie Pass yesterday, running them tubeless. Buttery smooth. 10/10

Having done 3 long weekends around Flanders, once on S-ones and once on G+ Corsas the latter wins hands down. Latex tubes, obvs

once again to voice how impressed I've been with GKs, even on frosty icy roads have been good so far.