What gearing do you guys have to effectively skid stop. I think 42X18 is all I can do, but since I am commuting fixed now and can effectively climb the one steep hill on my commute -- I ride a 49 X 18 (all fixed) and a 46 X 17/15 -- At 90 RPM -- I can go around 19-21 mph which is a good clip for me. It is really hard to skid stop and not worth the effort, plus on the way down, traffic is also flying by me down the hill on this narrow road and there is a stop sign in the bottom. How about if if it's raining or snowing and you are going down a steep hill? You may skid but maybe nor stop.