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Am I correct in thinking a maxxis 2.25 tire like an ardent or crossmark sizes the same as a high roller 1 or minion dhf 2.35?
Which is larger or smaller? I like the old 2.35 size for most stuff.
Cheers for your experience 
I reckon a new 2.25 comes up somehwere between an old 2.35 and 2.5 - probably more towards the 2.35.
This is comparing a Crossmark 2.25 LUST to 2.35 / 2.5 Mk1 High Rollers.
a little bigger. As above comparing a 2.25 crossmark to a 2.35 highroller
Perfect, thanks for the advice.
Any ideas of the faster rolling - Advantage V Ardent 2.25? 
My 2.25 Ardent is slightly bigger than my 2.35 Minion DHF. It is also considerably faster rolling than my 2.1 Advantage.
The ardent does roll faster thn the advantage but is scary in the wet. A rear summer choice only unless you only ride trail centres IMO.
Was going to keep my minion 2.35 up front so it is a choice for the back as my lust HR is dying and was dragtastic.
I reckon my 2.25" advantage is about the same overall volume (tread+carcass) as my 2.5" high roller. I reckon a 2.25" advantage might have slightly more carcass volume. tread is lower
certainly a fair bit bigger than my 2.35" high roller, 2.1" crossmark or a 2.35" larsen TT
A bit bigger than a 2.25" Schwalbe NobbyNic/Albert, which is about in the middle between 2.35" HR and 2.5" HR/2.25" advantage
Probably about the same as a 2.2" Bontrager XR4 (at least the 2009ish-2011 one
Probably only slightly bigger than a 2.2" Specialized Purgatory
Ceratinly a fair bit smaller than a 2.3" Spesh Eskar