That really depends. For me I used a 32(oval)x42 combo last time... I suffered. This was on my dual sus which is about 2-3kg heavier than my hardtail. I am going to do it now on my hardtail with a 36(oval)x50(maybe 52) If I had a 50 at the back on the dual last year, with the 32, then it would have been perfect. But again thats just cause that bike is so much heavier. I don't think you can spin out anywhere cause you don't pedal on the downhills anyway so rather go for a climbing combo if you had the choice. (plus 32 is smaller, saves weight )
