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I'm a big guy, 280#. I went with a spring for my weight and novice B. It was too stiff. I ended up with Novice C rider. Now my set-up is perfect. still a little stiff on bumps/potholes that come up on you quick but I can go WFO over the ruff stuff and the bike is real stable. One of the best mods I've done.
do the forks also