The Schwalbe Rock Razor we’ve previously rated as a best back tyre now rocks Schwalbe’s new Addix compounds. Superb, fast rolling rear tyre experience.

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Schwalbe Addix compounds are designed by the boffin that invented Conti’s Black Chili rubber, the complex recipes aim to increase durability, while also improving damping and grip.

This semi-slick design uses a low profile, file-like tread and rolls fast anyway, so it was a no-brainer to opt for the softer Addix blend here.

There’s a slide-to-grip sensation that’s basically a heap of fun, without ever feeling too sketchy. The new Addix soft version is unexpectedly decent in damp conditions too, with adequate grip and braking hold in everything but proper mud.

The Rock Razor nails it – the huge air volume enables lower pressures for good comfort, the casing doesn’t flex too much laterally and there’s a surprising amount of stopping power.

The thinner Snakeskin version is very light too, so there’s no trade off when choosing it over a fast rolling XC tyre lacking the extra security of those jutting side knobs.

The tougher, Super Gravity model is best in rougher areas – it disguises its weight well, and has excellent turnover and a great dynamic ride feel. Schwalbe tyres wore quite quickly before, but we’ve not had enough time on this new Addix model to report on the improved durability claims.

One thing’s for sure though, this classic design still delivers a superb, fast rolling rear tyre experience.