At 160-170lbs you are on the boarder line of two spring rates. Depending on your personal preferences I would recommend 1.05kg springs if you prefer a little softer ride or 1.10kg springs if you want a little firmer more aggressive ride. From how you described your riding habits I would lean towards the 1.05kg springs.Mike, not to go OT on original thread, but since its posted in here... What spring should a 160-170lb rider be looking for? I dont do track time, mostly pleasure rides, and some quarter mile blasts in the near future. Thanks. And being decently mechanically inclined, are the fork springs something I can do, or need to take to a shop?