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@qckpckt
Wicksie: the roc atacs are kind of between the aliums and the atac XS. As far as I know they are the same body design as the XS and XS carbon, but are heavier and aren't as fully featured. It seems that they don't have adjustable spring tension like the XS and XS carbon, but then again the picture on chainreaction seems to suggest that they have the exact same flathead screw, so maybe they do?
Either way the new design is superior to the aliums because its better at avoiding cloggage and the spring-loaded bars are beefier and therefore stronger. worth the extra money imo.