hmmm well the super cross 2 is fat !!! i mean massive lol so if you want a fat tyre i would go with the bob but if i were you i would go with the lighest wheel set and a pair of 24"fs100 2.10 coz the 2.10 would be fat on both rims so thats my
i couldnt tell you i hate holy roller so i dont have a pair to compare it too lol
but this is off the maxxis website :Tire Size Tire Size 26x2.20 26x2.20 TPI TPI 60 60 Bead Bead Wire Wire Max PSI Max PSI 65 65 Weight Weight 800g 800g Durometer Durometer 60a
get a hollow pin chain, also buy a new brake lever (dangerboy mechanical brake lever) buy schwalbe tabletops. also buy some dmr v12 magnesium pedals. those are just small things but will shave alot off in the end. you will shave off up to 3/4 of a kilogram(over a pound)