Sloar: You're clearly not a short person given the size of that Trek you provided and what it's seat height infers for your leg length. Still, you've chosen a better length in the 170's as you say you're a spinner. For what it's worth, I've found that staying on the saddle as much as possible rather than standing while climbing mattered quite a lot for my knees. Climbing out of the saddle puts a lot of strain on knee joints; it's far better to exploit all of your wide gear range and stay on the seat while spinning. That's how you get to keep on riding when you're an old guy.