[Author Index] [Date Index] [Thread Index]
[Date Prev][Date Next][Thread Prev][Thread Next]

Re: [ST] tire pressures



I think I've left out a key element.  Problem is I can't remember.  Sorry to
get you all confused.  I'll have to dig through the file cabinet and see if
I've got the info around here somewhere.

"Cold" probably would better be described as ambient, such as if your
motorcycle has been in the garage all night and you are wheeling it out in
the morning and then check the temperature.  Our you've been riding all day,
and park it and let it sit for about an hour (but don't leave it in the
sun).

My initial thought is that we're missing the key element - recommended tire
pressure for a given load, for which we could then extrapolate what we need
based on a different load.  I think I'm confusing minimum tire pressure to
handle a load without tire destruction vs. good tire pressure for regular
use.  Which still doesn't leave us with any answers.  My fault!  I'm going
to look into this some more...

Mark Collett

Proverbs 3:5,6

><//>
- ----- Original Message -----
From: "Barry Evans" <barryevans@xxxxxxxxxxx>
To: <ST@xxxxxxxxxxxxxx>
Sent: Monday, August 11, 2003 8:11 PM
Subject: 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 o
f
> 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
> >
> > ><//>
>
>
>
>      *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *
*
>       The ST/RS Mailing list is sponsored by Jack Lilley Ltd.
>           http://www.TriumphNet.com/st/lilley for more info
>    http://www.TriumphNet.com/st for ST, RS and Mailing List info
>


     *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *
      The ST/RS Mailing list is sponsored by Jack Lilley Ltd.
          http://www.TriumphNet.com/st/lilley for more info
   http://www.TriumphNet.com/st for ST, RS and Mailing List info

=-=-=-= Next Message =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

End of st-digest V2002 #1159
****************************


 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

                      End of Triumph ST/RS Digest
            ST/RS Digest is sponsored by Jack Lilley Ltd.
          http://www.TriumphNet.com/st/lilley for more info
   http://www.TriumphNet.com/st for ST, RS and Mailing List info

          This digest Copyright 1999-2002 TriumphNet.com