Urgent! Tyre pressures needed fir standard rubber!

[Billythebiker]

Right good people, finally back in the saddle... Going up to see perds and that in the morn... Shocks are sorted..now need tyre pressures but have had vastly differing advice.. From gents I trust! As low a 30 psi front to 42 and as low as 28 rear to 44 psi! Help me, I'm a confused numpty!

I'm 13st (182lbs) and will be carrying as little as poss for the weekend, riding one up, if that's any help!

 

[JT]

34 front and 42 rear......unless you are darkside in which case anything from 27 to 31 rear. There has been some talk about the front tyre pressure as a result of "cupping" wear but having raised it with my local Triumph guy (who's opinion I respect) he said stick with the 34.

See ya to-morrow!

 

[Billythebiker]

42for the rear is pretty consistent advice... Now the front pressure is ranging from 34 to 38?

 

[Billythebiker]

Ok... I think!

 

[Hipporider]

Good to hear ya back on the Rocket, Billy.

I run 36psi cold in the front and 42psi rear when i run a metz.I am running a Goodyear 225/50/16 F1 Eagle now and at 29 psi cold,its sweet!

 

[Blastedbones]

The thing to keep in mind is the difference between warm tire pressure and cold. If you fill ur rear tire to 42 cold, you will be closer to 46-47 when the tire is warm. I have mine set to 38psi front and 42 psi rear warm. Measuring the tire cold is more consistent as you can't really tell how warm ur tires are on a given day. I'm thinking 36 front and 38-39 rear cold will put them where you need to be when the tire is warmed up.
Correct me if i'm wrong...

Pretty much with Templar on this one but I go with 38 frount 40 rear ( hot) 42 rear is ok, but tends to slide more under full power in corners.Still.. I prefer over, to underinflation on the R3. Bit heavier, about 17 St. at the moment.

 

[atomsplitter]

The lower the load the lower you can run your pressure. Rule of thumb, for every 50 pounds of extra load, add 1psig. With the bike unladen (other than the 150 lb rider) set to the least pressure. If you are above that add 1 psig, at 50 lbs, add 2 psig, over 150 lbs add 3 psig. Tire pressure should be at max when your bike is fully laden. So at 180 lbs you should be 1 psig above lowest pressure and can carry 20 pounds of gear. more cargo than that add another pound. If you add only a 130 lb passenger add 3 psig. Tire load range is calculated on heat calculations of the contact patch. As you increase load the contact patch increases unless you further inflate the tire. So what you are doing is maintaining contact patch area as close to constant as possible under all load conditions. Grip (friction) is a coefficient of the contact patch size applied to tire compound. If you deflate a tire to 0 psig (flat) and try to push the bike you have a huge contact patch and mondo grip. Run it at 60 mph and the heat generated (friction) will disintegrate the tire.

So there a you have it.

 

[Blastedbones]

So.. multiply the square root of your weight by Pi, then divide by the atmospheric pressure in metres of mercury......

 

[Hipporider]

Stone the crows, Atom,thats a good guide!I just pump up the tyres to what it says in the manual more or less,though with the Darkside ,its a case of experimenting

Bones....Julius Sumner Miller, just for you....http://www.youtube.com/watch?v=P0GQ33mOo9E&feature=related

I used to watch his shows as a kid.Wouldnt he have made a mad freakin teacher?? :eek3:

 

[ruzzle]

Two thirds of five eighths of not very much.....