At what tempature will you notice poi change in a springer. I realize there are a lot of variables like lube used and seal resistant. Just looking for a range. Its 31 today! Don
They are all different. My HW97 poi shifts 1 mil from 75f to 45f. It seems mechanical, because my trajectory stays the same. If you use Maccarri heavy tar on your spring you will probably see a loss in velocity below freezing.