Tire pressure question - Chicagoland Sportbikes
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post #1 of 12 (permalink) Old 08-09-2011, 11:13 PM Thread Starter
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Tire pressure question

So, my Fz6 book calls for 33 psi in front and 36 in the back

My buddy, who has been riding for 15 years, currently on a Concours, daily 80 mile rain or shine commuter…. Says, “I always run way higher than the spec… put’em at 39 and 40”.

Is my buddy an ignorant tool or does he have a point? I thought there would be traction loss so I left them at spec.
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post #2 of 12 (permalink) Old 08-09-2011, 11:15 PM
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Leave it at spec. I inflate my car tires and my blow up doll to higher specs but I don't like taking the chance of a blow out on the bike.

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post #3 of 12 (permalink) Old 08-09-2011, 11:16 PM
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Quote:
Originally Posted by Nic View Post
So, my Fz6 book calls for 33 psi in front and 36 in the back

My buddy, who has been riding for 15 years, currently on a Concours, daily 80 mile rain or shine commuter…. Says, “I always run way higher than the spec… put’em at 39 and 40”.

Is my buddy an ignorant tool or does he have a point? I thought there would be traction loss so I left them at spec.
Is your buddy a Yamaha engineer ?
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post #4 of 12 (permalink) Old 08-09-2011, 11:26 PM
I don't know...
 
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higher pressure, less movement in the rubber,
less movement in the tire, less heat generated... less traction
less movement in the tire, smaller contact patch... less traction
higher pressure, less wear however is it worth it to risk a crash?

forgot one thing....
when do you check the tire?
OEM specs are cold, if your buddy checks his tires after riding for a while(hot) he might be RIGHT....

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Last edited by Germany; 08-09-2011 at 11:34 PM.
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post #5 of 12 (permalink) Old 08-09-2011, 11:34 PM
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Ur buddy is an idiot. Plain and simple.
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post #6 of 12 (permalink) Old 08-10-2011, 08:18 AM
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Quote:
Originally Posted by Uncle Steve View Post
Ur buddy is an idiot. Plain and simple.
Yup, plain and simple




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post #7 of 12 (permalink) Old 08-10-2011, 08:56 AM
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check the specs for the tire on the bike, not the majical numbers your bike manual gives you for all tires
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post #8 of 12 (permalink) Old 08-10-2011, 09:09 AM
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Meh ....

On a bike ridden two-up a big sport touring or touring bike .... where tire wear is more
critical than optimum grip many bikes respond well to slightly higher pressures.



Even on a sport bike used for commuting ..... a little extra pressure reduces
tire wear, reduces the tendancy for the tire to track pavement lines ( crack - steer )
but it also reduces GRIP.


It's all a trade-off.


Tires should always be set cold.

You should never exceed the maximum pressure on the tire sidewall.

You should set your pressures with your ride in mind - street pressures do not work on
the track. Touring / commuting pressures don't work well for crankin it solo ...



IMO 39 + 40 is really hard unless you are riding two-up. 38r +36f is my idea of a
good street pressure .... unless I am planning to push ..... then it's more like 34r, 32f.


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Last edited by BLARNEY; 08-10-2011 at 09:12 AM.
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post #9 of 12 (permalink) Old 08-10-2011, 09:26 PM Thread Starter
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Yea, that's what I thought. I will leave them at spec and shun my buddy.
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post #10 of 12 (permalink) Old 08-10-2011, 09:41 PM

 
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You're more likely to have a blow out from to low a tire pressure rather then to high.

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post #11 of 12 (permalink) Old 08-15-2011, 07:20 AM
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with a lower tire pressure for street riding, you have a higher chance of bending your rim over a pothole.

the air acts as a cushion to withstand the shock of hitting a pothole

by me changing tires ive seen plenty bent rims

i run 40/40 with no problems on the street

when i did track i ran much lower pressures for faster lap times

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post #12 of 12 (permalink) Old 08-15-2011, 07:33 AM
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Keep it at what ever says on your sticker. You can also check tire mfg as they often have their recommended specs for your bike.

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