The math is simple: The cash you can get for your old bike (X) versus the cost of the new rig you’re lusting for (Y) equals a pallet of cash ($$$$). The concept is basic: Can a percentage of that cash make your haggard old bike as great, or even greater than the fresh new rig you’ve been flirting with?

I’m going to present the argument, for your consideration, that it absolutely can. The examples I’ve put together below are bikes that friends have owned or currently own, and that I’ve ridden, but this piece could have easily been twenty bikes long without a single dud.

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