I've seen the Ragley's, anything else out there that has stacks of mud clearance?
My Ragley Blue Pig X has loads of clearance and my previous Dialled Prince Albert was pretty good too. I ran large volume 2.3 and 2.4 tyres on that with no clearance issues.
I run a 2.5 Minion in the back of my Bfe all year round in the Epping Forest mudfest, never had any issues.....
Although DMR have recently stopped making them, the Ex[alt] can take up to a 2.5" rear (and some users say a 2.7" Maxxis will fit).
I've got a Dual-ply High Roller 2.35" on mine and there's absolutely loads of room.
surly pugsley?
Have had a 2.4" Conti Rubber Queen in the back of my 16" Blue pig with loads of room to spare and they come up huge, a mate had it on a 456 briefly but it rubbed the seat stay bridge...
I had a Norco Torrent that would happily take a 2.7" dual ply Gazzalodi 😯 and I suspect the Ragley would too ?
IIRC Brant ran his with a 24x3" Gazzalodi for a while
I run 2.5 minions on the back of my Summer Season with no issues at all.
BFe definitely has loads of clearance, had a 2.35 Bonty ACX (bigger than a 2.5" Maxxis!!!) on the back of mine with mud clearance, rode it right through winter like that too.
Only sold the frame cos it was too much bike for me really.
Sovereign - massive clearance
My 456 takes a 2.5" maxxis and a pretty bent rear wheel without any complaints.
Actualy, if you're after an 18" I'm selling it.