I will probably use the 29er for iceman which is a week away, yikes! It's a little different, but I don't get confused by the gears which are like my road bike, so I'm used to the way it shifts. The 26, I had to put my thumbs under the handlebars to shift, and with 8 rear sprockets there was a big jump between the largest and next one down, caused me some anxiety going up hills. I've only been on my new 29er once and it climbs like a dream!