I rely on experience more than anything else.
I know what tires work best for me, I know how to fit myself on a bike, and i know how much more i like low gears getting up a hill rather than grinding a big gear.
The good news for me is nobody is paying me to ride a bike, or to be fast or win races (that would be wasted money!), so I don't feel compelled to listen to experts, I just do what I like.
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