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Tire pressures...ho hum

Printed From: guzziriders.org - moto guzzi forum
Category: Technical
Forum Name: Big Block Tonti
Forum Description: Spada, Le Mans and Cali
URL: http://www.guzziriders.org/forum_posts.asp?TID=8771
Printed Date: 28 Mar 2024 at 12:30
Software Version: Web Wiz Forums 12.03 - http://www.webwizforums.com


Topic: Tire pressures...ho hum
Posted By: cugsy
Subject: Tire pressures...ho hum
Date Posted: 13 May 2018 at 17:35
Not a very exciting topic.  I'm told by the handbook for the 99 cali ev that it should be 32 front and 36psi rear. Now, because I've had loads of bikes and run them at 36f 42rear, I've carried on that bad habit and assumed that the fat Italian would benefit from some more air.  Am I wrong? Am I way off and despite 20 years of progress I'm supposed to still have them 32/36?  The bike does tend to run a little wide (understeer ) when I give it some welly - especially on damp roundabouts.  Mind you, I could go slower.   John

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Due to italian electrickery I am saying nowt. Despite nearly giving the Vstrom away the honda has gone...



Replies:
Posted By: jpc
Date Posted: 13 May 2018 at 17:50
In classic racing where you have no recommended pressures to go by, I used the rule that the pressure should increase by 0.2 bar from cold to hot (immediately after leaving the track).
If the increase is more than 0.2, the tyre "works" too much and needs more cold pressure, and vice-versa. I used that for years with different bike / tyres combinations, it works well.
(How is that not exiting ?) Smile



Posted By: cugsy
Date Posted: 13 May 2018 at 17:58
I'm just curious whether new tire tech has made it necessary to change tire pressures from original. The ride is lovely and soft. But there are occasions when I feel the front fight me - tire pressure? 

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Due to italian electrickery I am saying nowt. Despite nearly giving the Vstrom away the honda has gone...


Posted By: nab301
Date Posted: 13 May 2018 at 19:43
Originally posted by cugsy cugsy wrote:

Not a very exciting topic.  I'm told by the handbook for the 99 cali ev that it should be 32 front and 36psi rear. Now, because I've had loads of bikes and run them at 36f 42rear, .   John

I've never ridden a Cali but i have a'99 BMW  R1100s  which i've owned since '03 ish and the handbook suggests :
32 f and 36 r  solo
36 f and 39r  with pillion
and the magical 36 /  42  with pillion and luggage.
However  the tyre   manufacturers  now suggest  just  one setting  36 f  42 r  which is what i've been using for years.
That is however  for  120/70 and 180 /55  Radial tyres .   X ply  type construction  tyres which I think are fitted to the cali ( they're definitely fitted to my breva) always seem to have lower recommended pressures.




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Nigel
Keep smiling , it makes people wonder what you've been up to!
'19 CB125F,

'18 DL250 SUZUKI V STROM,'99 Bmw R1100S, '03Bullet 65 500, '93 MZ301 Saxon fun (offroad)


Posted By: Brian UK
Date Posted: 13 May 2018 at 21:18
Well worth checking the tyre manufacturer's web site to see what they recommend. Tyres have changed technically since the Guzzi book was written.


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Brian.

Better 5 minutes late in this world than years early in the next.



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