I have a 2005 Kona Explosif in pretty good condition and recently had stolen both wheels.  I need to replace everything: rims, tyres, rotors(dont know the size I need) and cassette (dont know size I need).

Any ideas on the above would be great thanks.

Jason 

Could be an expensive trip Jason. What's your budget and what's your favoured type of riding? Note rim width isn't neccessarily a guide to wheel strength. The hand-built wheels on my stolen bike only had narrow light 717 rims and 2mm x-ray spokes but they were much tougher than my new WTB Speed disk wheels with thinner spokes which have warped 3 times in just a few short weeks. Find a wheel builder who knows his or her stuff and let them guide you.