Hi air pressure behavior?

Have any of ya ever run over 50 PSI in any bikes but especially Commandos?
I know what its like but wonder if anyone else does?

NO! :evil: 30 to 36 pounds Avon Road Rider

Not on purpose!

I stopped at a "service" station to use their air hose, suspecting that my rear tire was a wee bit soft. I had trouble getting air into the tire, I as astounded by how much effort it took to get it to near 30 lbs. After I got back on the road the bike was making a humming noise that was very odd. So I went in search of a pressure guage and discovered I had about 70 lbs in the rear tire! (I now have a pressure gauge in my tool kit)

Now where is that thread on stupid things I have done to my commando?

Russ

When I first got my new Avon Super Venoms the salesman told me to run them a 40psi. It was downright scary. I enjoy them much more at 29psi.

Ok thanks, I'd forgot I even asked. Hoped no one else liked extra hi PSI but me. Wonder what made the hum sound @ 70 lb - rubbing on something?
For best comfort over rough stuff I like 29-30 in rear and about 2-3 less in front, but I know better than press tires near limits if that low and soft.

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.

I think the humming (best way I can describe it) was the sound and feel of a tire that was about to blow up! It certainly let me know that my rear shocks are in need of some attention. I can think of no road condition which would be improved by doing this intentionally.

I am just glad I didn't do both tires...scare me now to even think about it.

Russ

Ah so oldbackslider knows the score on low air on rough stuff, cool.
Russ you exceeded my hi PSI experiments by a good margin, I'll be alert to the hum.

Ms Peel kept getting better and better the higher I pumped her tires up for highway use but no air stations for 20 miles from home, so quit at mid 50's PSI d/t so rough a ride off pavement to get in and out. New Peel has air on board so will experiment upward on pavement but let it down to get on home with fillings still in place.

I think newest modern race tires are using 40's PSI but not sure about that yet.

Actually for the late model sport bikes - the 600s/750s/1000s, Dunlop, for its barely treaded race tire the "211" calls for the rear to start at 20 lbs cold and to be at no more than 25 lbs hot with the front at 27 cold, 30 hot. It's a similar story with Pirelli and Michelin.

I get to read the bike magazines and saw some new tires air into 40's PSI.
Ms Peel seems to be able to both exceed race bike loads on tire edges and to tolerate the lack of tire compliance with 'normal' upper 20's to lower 30's.
I was not able to find limit of hi air hard tires on Ms Peel, only got better like a ballerina soft slippers switching to an ice skater on hard precise edges. What that implies to me is Commando isolastic chassis with rear link is superior to any thing yet fielded. I hope you are right about no 40+ PSI racer level as that would imply to me I'd be hard pressed to match their road holding tolerance as don't think I could hook up power to match in straight line sprints of fat rear tire. I know for sure how soft air tires work on hard surfaces and don't like it one bit.