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I have a pair of Horizons in the shed, they felt ok, but for some reason the sidewalls kept weeping sealant, maybe I didn't ride em enough or used the wrong sealant.
Had a pair of Ramparts (700c), just felt wooden.
I'm gonna wear these gks out before I spend more money on tyres, although I did enjoy the feel of Ultradynamico cavas, so if they ever come back in stock may give em a go in 650b flavour.
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The Horizon were nightmare with tubeless as they’re ancient compare to modern tubeless, and yeah the Rampart I found them equally wooden with the 700 x 38, but really work better on 650b on account of smaller wheel = less weight for similar volume.
Look into the Vittoria, I think you may find them surprising as the centre is perfectly smooth and felt similar to a road tyres at a slightly higher pressure.
Gravel King felt stiff and heavy compare to similar tyres, even WTB Horizon felt better and more supple, was a fan of GK when it was the only real alternative for not a lots of money.
Alternative is Vittoria Terreno Zero, Teravail Rampart and Pirelli Cinturato M to name but a few, all of them can be had for around £100 or less.
Rene Herse were amazing tyres until recently where the slightly less expensive option mentioned above mean I can get decent grip/feel for half the price to the point it doesn’t feel like I’m gonna get £100 better grip/feel by going for RH.