Other posters give their opinions on why there's a difference between IPF and other federation world records.
Is it just the caliber of lifters (seems unlikely given that Coan/Siders/Karwoski are names they can claim), or is there more help from equipment than we realize?
Of course, that's circular logic and is therefore flawed. Finn thing offers his view:
It is behind because the three best deadlifters (Bolton, Frank, Benni) do not lift in the IPF. These 3 men have all broken the deadlift record in the past few years.
IPF lifters are drugtested... - WPC/WPO bars are longer and bends more