Hi guys, Don't know if this is the place - couldn't find a FAQ section or something similar. Basically looking to get into MTB with the girlfriend. Total newbie. I need to kit us both for under 10k. Steep ask, I know... Thus, looking at second-hand bikes. I am 1.88m and weight about 100kg. I have seen a guide that indicates that I need to look at a frame size of 21/23". How important is the proper frame size? Also, what size tires does one need to get? 26" or 29" ? Where do I find a proper bike that I can trust to not be a rip-off? What specs do I need to look at for shocks, group set etc ? What do I need to watch out for? Can anyone give me some sort of advice? I've asked around for second-hand shops but can't seem to find one. Some links to good solid buys in the price range would be really appreciated (even off-site links will do :-) ) Basically I'm as confused as can be by all the jargon out there. Pretty intimidating.