some of the Ice boot conversions i have done for my lad, 4 wheel inlines on 64 mm wheels look wrong and clumsy to me, top one is a 3x80mm which is probably a bit tall, the 3x72 one which is the lower one looks better and is used very effectively, lower frame is 3mm carbon and has taken some serious use over 2 years on several boots, upper frame is 2mm carbon with a heel spacer and is relatively unused at present http://imageshack.us...6/dscf0797.png/