In the 70's and 80's, while racing in Griffith Park - a very tight low average speed road - I got better traction, and covered over poor suspension by running 17 lbs in a 4.10-19 K81on the rear and 19lbs in a 3.60-19 K81 on the front. On Sundays, we 'd show up with low pressure for the "park race" and when we'd leave for Angeles Crest or the Rock Store, we'd gas up AND air up. You could put up with the wallowing in the park but not when the average speeds got higher.