Tyre pressure query

  CurlyWhirly 22:08 08 Jul 2011

I've recently bought these" target="_blank">http://www.michelin.co.uk/motorcycles/michelin-pilot-road-3#tab-tyres-sizes">these tyres.

I can't find the link now but I read an article on the Michelin website which stated the effects of having under-inflated or over-inflated motorcycle tyres.

I've been riding motorcycles for over a decade and have always allowed the front tyre to be inflated to a few PSI less than the rear tyre.

The motorcycle that I'm currently riding uses tyres that can be inflated up to 42 PSI in each tyre.

I currently put 40 PSI in the rear tyre and 35 PSI in the front tyre.

Does anyone know if it's a good idea to have this arrangement or should both tyres have roughly the same amount of air in each tyre ?

If there's any fellow bikers here who can offer advice, I'd be grateful.

  CurlyWhirly 22:09 08 Jul 2011
  OTT_B 22:30 08 Jul 2011

If you contact Michelin they will give you advised tyre pressures for your motorcycle.....


  CurlyWhirly 22:34 08 Jul 2011

OTT_B - I already tried e-mailing them a few days ago but no response so far.

  Quickbeam 22:34 08 Jul 2011

I always preferred 32 x 36 psi, but that was on lighter '70s bikes with 18/19 inch rims.

Check this out for more modern bikes http://www.drivegreen.com/MotorcycleTirePressure.htm

  CurlyWhirly 22:41 08 Jul 2011

Thanks Quickbeam, but your link doesn't work even after adding the end bit to the URL.

  woodchip 23:18 08 Jul 2011

I would put in what they are made to take, this way they will work as they are made to work at development pressure. Maker knows best. also if they are run under pressure they will overheat and likely to pop if driven hard. And its no good for the walls of the tyre

  woodchip 23:21 08 Jul 2011

PS Curly you should only fit the tyre size and type that the Bike is made to take as fitting other tyres can infringe your insurance if something goes wrong. In other words they have got a get-out if you have a crash etc

  namtas 04:43 09 Jul 2011

The correct size and tyre pressure for your bike will have been determined by the machine manufacture after having done extensive tests, these recommended pressures and sizes are advised irrespective of brand selected. This information will be provided in the owner manual.

  morddwyd 07:54 09 Jul 2011

Never guess or estimate tyre pressures, especially on a bike, except in an emergency (re-inflating after a puncture etc.).

As Namtas says, tyre pressures will have been decided upon by the manufacturer after extensive tests and research, including consultation with the tyre manufacturer, and compliance with the Construction & Use Regulations.

Unless you're someone working in a pit like Rossi's you should no more choose your own tyre pressures than you should choose your own viscosity oil.

At the very least it will cause excessive and uneven wear (in the centre if over inflated, on the shoulders if under)

  CurlyWhirly 08:05 09 Jul 2011

Woolwell - sorry don't get you.

woodchip - as the tyres are tubeless I have no alternative but to fit the correct sized tyres as otherwise they would leak.

I have consulted the owners manual and it says:

"The recommended cold tyre pressures are:

Front tyre - 250 kPa (2,50 kgf/cm2) Rear tyre - 290 kPa (2,90 kgf/cm2)"

This is what Honda recommend. This is in contrast to what is on the tyres themselves which is:

"Inflate to 42 PSI" on both tyres.

p.s. on the conversion, 2,90 kgf/cm2 is the equivalent of 42 PSI and 2,50 kgf/cm2 is the equivalent of 35 PSI which is what I'm running them at !

This is what my local motorcycle shop recommended.

namtas - so I should carry on with the tyre pressures that I'm currently using then ?

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