Fair play! I'm not gonna be running 18:12, but it's near as makes no odds to what i will be running like 22:15 or 20:13 - just cant see many people running those!
Sounds like it'll do me perfectly then, had a play on Joel's 609 the other week and was running 22:16, so slightly harder than my old 22:17 set up, and even that felt mentally light! This bmx with ManGear has ruined me
EDIT: another vote for how the hell you're running 18:15, i had that on my Pitbull and thought it was too light