Okay, two weeks ago I was after a road bike to bash out some miles on, and see if I enjoyed it. However, I've been running some trails near where I live on my trusty old steed. With some discussions over beer, and the like, I've decided that perhaps a new MTB is in order. Naturally, the path that way isnt any clearer than a road bike, with pitfalls and pro's and cons at every corner, I thought I would open it up in here for opinions and feedback. So to the dilemma's: 29 or 27.5? I am a big lad, 6ft 2 and on the portly side, I dont think i would have any issues throwing either of these rides around the courses I run (mostly farm tracks, and footpaths around reservoirs and the like, with roads leading to and from those.) Nothing remotely technical, but the farm tracks can turn to a quagmire in the winter. Gearing 2 or 3 chainrings? I've read up on the relative effects. with 2 you get a little less on the downhills and its a little harder on the ups. with 3 you get more of an overlap of gears, but a friendly granny cog for when your all out of puff and the hills a killer. On the flipside, and being a tubby, I like going downhill, I like sticking it on that big ring and getting some speed up. My pb was 34mph a few years back. I would be reluctant to buy a new ride, only to find out I cant wind it up to that kind of speed, I am not so bothered about the wheezing uphills, thats just something for me to overcome. Do any of you have a 2 up front, and miss the 3rd? The reasons for the change of heart and heading into MTB? Where I live, the motorists drive like maniacs, I dont fancy riding at pace around people who dont give you an inch, with an MTB I can stick to the tracks, and keep the traffic to a minimal. Also, Baggier clothing! Any opinions welcome, Brands to look at, or steer clear of as always would be welcome.