Cranks: Try to get some CNC'd cranks as they are lighter Freewheel: A Tensile 60 click is a reliable freewheel at a good price. Make sure it is an 18 tooth as this makes a really good gear ratio of 18:12 with a 12 tooth sprocket Sprocket: As i said above, try to get a 12 tooth sprocket so you have an 18:12 gear ratio because this is used by loads of riders. Don't know much about hubs so someone else will have to recommend one to you.