michelin pilot road 3 tyre pressures

[Val]

Hi Guys,

I am 18 stones gear up and run 36 psi front and 42 psi rear.

Any idea how I can have exact tyre pressure calculated for me?

The Yamaha owners manual say for high speed high load (me) the front must be 2.25 bar (32 psi) front and 2.9 bar (42 psi) rear.

The Haynes manual say 33/42 psi.

Micheline site say nothing.

Any ideas?

[darrsi]

Stay as you are.
Or try 32 and you'll then realise it's a lot better at 36.

[unfazed]

Michelin recommend standard Yamaha pressures to be used in the PR3 and 4s.
The reason for the discrepancy in pressures is probably because 2.25bar is 32.63psi and Yamaha round it down whereas Haynes round it up.

Start with 32psi and try different options up to 36psi until you get one that feels right. Use the same pressure gauge each time to ensure you are comparing like with like and when the tyres are cold (before a ride out not after). Service station guages are notoriously inaccurate, buy a good  pen type guage (like PCL) and keep it with you.

[Frosties]

Hi Guys,

I am 18 stones gear up and run 36 psi front and 42 psi rear.

Any idea how I can have exact tyre pressure calculated for me?

The Yamaha owners manual say for high speed high load (me) the front must be 2.25 bar (32 psi) front and 2.9 bar (42 psi) rear.

The Haynes manual say 33/42 psi.

Micheline site say nothing.

Any ideas?

Same weight as you Val, running PR3's with same 36/42 pressures. Bike seems bang on to me for handling etc 

[Punkstig]

20 year old bike manual Vs nearly the most recently developed tyres- go for the tyre manufacturers recommendation, I appreciate you said you couldn't find info on the site but they do say 36 front 42 rear, by all means reduce the front to 32 if/when you do a track day, or its a very hot day and you're going to give it a proper blast around!

[tommyardin]

Or leave off the Pies 

[BBROWN1664]

There is a formulae you can use relating to the actual weight supported by each wheel and the load rating of the tyre (the 93V or whatever part) which you can find on the web.

The formulae is :

Max pressure of tyre (from side of tyre) divides by the result of (Max load (from side of tyre) divided by Actual load (Total weight including you on each tyre))

i.e.

If max pressure is 50psi and max load is 150Kg and actual load is 120Kg =
50/(150/120)=50/1.25=40psi

[Frosties]

Or leave off the Pies 

Oi wrinkly.....18 stone isn't fat when you're 6'4" so  [size=78%] [/size]

[darrsi]

There is a formulae you can use relating to the actual weight supported by each wheel and the load rating of the tyre (the 93V or whatever part) which you can find on the web.

The formulae is :

Max pressure of tyre (from side of tyre) divides by the result of (Max load (from side of tyre) divided by Actual load (Total weight including you on each tyre))

i.e.

If max pressure is 50psi and max load is 150Kg and actual load is 120Kg =
50/(150/120)=50/1.25=40psi

.

[BBROWN1664]