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Re: [ST] tire pressures



OK, so on my rear 020 it says max load is 365kg (805lb) at 42 psi COLD
(which is?). So,

01 ST  dry wt= 207 kg
full tank + oil + coolant = 30kg (correct?)
Me (82 kg) + dry cloths (say 18 kg)  = 100 kg
Total = 337 kg

Therefore wt on rear tyre-
@ -say- 50% R/F distribution= 169kg (= 46% of max load)
@ -say- 67% R/F distribution= 225kg (= 62% of max load)
@ -say- 75% R/F distribution= 253kg (= 69% of max load)

(anyone know the correct R/F weight distribution is?)

Therefore cold tyre pressure should be set-
@ 50% = 19 psi
@ 67% = 26 psi
@ 75%= 30 psi

Either I have misunderstood your rule of thumb or (at 42 psi at c. 15oC) I
have been bouncing around like a kangaroo for too long!

Anyone want to fill in the blanks (what temp is 'cold'? wet weight of 01 ST?
R/F weight distribution?), correct my logic/math, or comment on the rule of
thumb.... or all three?

Barry



> Date: Sun, 10 Aug 2003 17:54:19 -0400
> From: "collett_mc" <collett_mc@xxxxxxxxxxx>
> Subject: Re: [ST] tire pressures
>
> Another rule of thumb is to calculate what you need based on the max load
/
> max pressure markings on the sidewall.  It takes some figuring ... but for
> example if your tire says max load 500 lbs @ 50 psi (just an example) and
> you can estimate the load on your rear tire (also taking into account
weight
> distribution) at 300 lbs, then try a pressure of 3/5 of the max = 30 psi.
> Then adjust based on handling / wear needs.
>
> Personally, I always run the rear at 42 psi all the time.  I'm 220 lbs and
> 50 % of my riding is with the luggage and my wife, so I need the least
> carcass flex I can get.  I still only get 4000-5000 miles out of my
Macadam
> 100Xs.  Interested to hear what folks think about the Pilot Road...
>
> Mark Collett
>
> Proverbs 3:5,6
>
> ><//>



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