I have a lithium 4.0 bike that I have been riding for about 3 years now. I love how it handles the singletracks and I can climb uphill pretty easily. Only issue with the bike is that the frame has two dents. One on the top tube and one on the downtube. I don't know how much longer it will last.
I have my eye on a Trek Liquid 65 frame. It's selling fairly cheap. I've done my research and most people like it. Back in 2005, the Liquid 65 retailed for $3000 while the Lithium cost $1600. I don't know too much about geometry but they almost look the same in terms of both using a pivot. Should I bite the bullet and buy it so I can replace my K2 frame once it fails?
Mtbr's 2016 Winter Biking GearReviews and Roundups
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