Originally Posted by
amor fati
I had a feeling this issue would come up. When I tighten on a lockring I first crank it down as hard as I can with both arms and then give the wrench a pump or two with my foot. I do this because I ride on the street and slow down and stop by back-pedaling and/or skidding and figure I should tighten on the lockring with equal pressure as I might put on the cog by skidding.
When you skid, you are putting the weight of your body, reduced by whatever gear ratio you are running, on the cog/lockring. That means that if you weigh 180 lbs and are running a 2.5:1 ratio, you are applying 75 lbs of force to the cog/lockring. Assuming that the lockring wrench is the same length as your cranks (which is approximately true), you should only have to put 75 lbs of force on the wrench in order to achieve the same force.