Maxxis Ardent 2.25 LUST on the back, Minion DHF 2.35 on the front all year round, but I do ride mostly in the Peak which tends to be rocky and rubbly rather than muddy. Brilliant tyres, no clearance issues with the 405, the Ardent is actually bigger than the Minion btw, despite the nomimal sizing .
Two things about Nobby Nics in the Peak anyway, one is that the rubber compound isn’t that grippy, second is that I got tired of destroying the sidewalls – just wearing through them – while there was still plenty of tread left on the tyre. If you must run NNs, use the 2.25, the 2.1 is quite low volume. They’re okay, but I reached a point where I just didn’t trust them at speed and they’re also stupidly expensive. The Maxxis tyres aren’t quite as fast rolling, though they’re not bad, but they’re so much more confidence inspiring ime.
I just took a 2011 Rev off my 405. Felt too tall and too light for me, screwed it up on steep climbs, stuck a Pushed Pike back on instead and feels perfect again. Ultimately though, it’s all personal preference, depends on your riding style, the trails you ride etc. I’m a pretty average, normal sort of rider and the above works for me, you could have totally different tastes.
Right, I’m off for a run in the snow.