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Tire pressures...ho hum

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cugsy View Drop Down
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    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
Honda nc750x ...hmm - a superdream for the 21st century? ZZZZZZ But the goozi is back running..yesserii jim bob. Fun time
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jpc View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jpc Quote  Post ReplyReply Direct Link To This Post 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

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cugsy View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote cugsy Quote  Post ReplyReply Direct Link To This Post 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? 
Honda nc750x ...hmm - a superdream for the 21st century? ZZZZZZ But the goozi is back running..yesserii jim bob. Fun time
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Post Options Post Options   Thanks (0) Thanks(0)   Quote nab301 Quote  Post ReplyReply Direct Link To This Post 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.


Nigel
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'04 Breva 750, '99 Bmw R1100S, '06 Triumph Bonneville '05 CBF 250, '03Bullet 65 500, '93 MZ301 Saxon fun
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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post 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.
Brian.

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