front/rear freewheel, comes down to budget and preferances, the best front freewheel is an eno, 72 engagements means you get a click every 5 degrees, it's more than enough and sturdy as sin. as for rear it's down to a pro2 or king, for stock, or profile r king for mod. i've used an eno and a pro2 and a few acs claws in my time, the pro2 hubs by hope have truley blown me away, f**king incredible sound; 48 engagements, is more than enough engagements, [i've never stuggled to find my biting point like with an ACS claw] but the sound, i've said already it's so re-asuring it's the same with an eno. but th pro2 feel far stiffer. but it's downto budget, £80 on a freewheel and 40-130 on a hub or £130 for a pro2 and then £20 for a sprocket. i don't have much experiance with kings and i couldn't justify £300 on a hub. but i'd advize a pro2 if you can afford one.