Tyre pressures.. Again.

Apologies in advance for another tyre thread...

I popped into see my folks on the way to London (50 miles each way) earlier and thought I'd check my pressures...
My dad has a digital pressure gauge he swears by, so we checked them... Both over pressure by 6-8lbs

Dropped the pressure to 36/42, then rode to work.

What a sack of shit. Wouldn't turn, lots of mid corner corrections and standing up on the brakes.

Got home, let them cool off and re-checked the pressure with 3 seperate gauges.

What a surprise. Both under pressure by 6-8lbs!

To all you messing with the recommended pressures - my recommendation is don't!

Pilot road 3's btw.

Thought I'd share

 

(Not directed toward APSeng): Heat always makes the tire pressure rise. All tire pressure should always be checked when cold before riding, or after a reasonable cool down period.

 

I always have my tire pressure at 36/36 the bike feels way too funny at 42 on the rear.

 

+1 check when it COLD :thumb:

 

I have been playing with the air pressure, I think 33f, 36 rear is the best. I ran the back tire today at 35-didn't track as well as 36 rear.:tsk: I run the lowest I can as long as the tires don't seem to sink-bad roads mean don't pump up the tires too much.:strong:

 

http://www.iun.edu/~cpanhd/C101webnotes/gases/images/eight.jpg

 

You lost me?!!

 

I've been riding bikes a lot of years and tire pressure posts make me laugh. They are just like tire preference posts. Everyone has an opinion as to what is the best tire pressure to run. I ride with a lot of sport bike riders, each of which has a tire pressure preference. I have always run tire pressures that the manufacturers recommend, and I have never had a problem keeping up with the majority of guys running their preferred tire pressures.

I remember going to the dealers once and buying a set of BT-016's that came off a new GSXR1000 with only 50 miles on. Got them really cheap as the new owner said they were crap and didn't grip well. With 2" chicken strips, I don't know what he meant by they didn't grip. Worked fine on my GSXR1000 at Deals Gap. Guess he was a more of a tire expert than I!

 

When in doubt blame it on the tires even though I can't ride

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If nobody goes for that , try air filters , oil or plugs.

 

Highest recommended pressures are for high speed and heavy loads (a passenger) but are usually too much for other riding. So your 42psi (maximum recommended) rear would ride better at lower pressures like 36 or so for solo riding.

 

Boyle's law. Posits that a volume of gas increases in pressure as temperature increases. See also Dalton, Charles and the mixed gas laws.

An empirical model can be demonstrated with a couple of balloons, a hand held hair drier and a watch with a second hand.

 

One reason i dont like 42psi rear is if you turn at a intersection that has those little lane guide boobie bumps on the middle of road (vegas has lots of them) the rear end hops or skips to the side, it doesnt seem to do that with 36psi because instead of deflecting the bump it absorbs it like a pocket.

 

Viffer...did ya go to Supercross last night?

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No i didnt, i was tending to a friends birthday party....

 

What kind of tire pressures would be in line for this rider? Maybe the experts can chimp in.
http://img.photobucket.com/albums/v724/jasilva/3767fat_ass.jpg

 

Uhg, 3 things wrong. 1) That needed a "not work safe warning" 2) Im effen blind!! and 3) i think shes needs something heavy duty like a Harley.

 

I run 38 rear and 32 front . Works for me but I only weigh 60kg,soaking wet that is!

 

How does it apply to nitrogen? Less expansion?

 

Only if it ain't LN2. N2 content of ambient "air" is +/- 78% . My guess is that if ya think using N2 in your tires is gonna make ya faster then go for it. I suppose there is some data someplace that suggests that the +/- 21% O2 fraction of ambient air acts as an oxidizer and that it eats away the lining of tires.

See "mixed gas law" for the overall effect of temp, heat and pressure of gasses. Law in physics means "fixed". The one exception is liquid Helium HE2 which is some really weird shit..

Some nitty-gritty stuff might include where the air or gas comes from if used for tire inflation. N2 is gonna come from a bottle of some sort usually a K bottle or smaller. It's gonna be dry. Air from a compressor depending on the traps and filters on either end maybe not so dry then ya got a different can of worms because of water vapor.

LN2 has an expansion ratio at ambient temps of about 800:1 which could be a little hard on a tire pressurewise but only if the tire freezers solid and shatters first. A DNF bigtime..