Cheers dude, those videos were pretty useful! In terms of a second hand bike, what are a few to look out for? just to narrow it down slightly! I've decided defo not 20", possibly 26" but really like the look of 24". But I understand that 24" bikes are a fairly new thing and are hard to get hold of 2nd hand? Is it worth buying all the parts and building a custom bike? It can be expensive I know but I can get pretty much any part at cost i.e. non retail price. Cheers.