Renault Laguna enquiry re tyre size's!
Variant: Privilage 1.9DCi
Model Year: 2002
Categories:
Steering, Suspension, Brakes, Wheels & Tyres
Hi all, info re the above please - the tyres on my car at present are '255 45 R17' but in the owners book it says they should be '225 45 R17'. Can anyone advice me if having the 255's is ok and legal? As always thanks in advance.
Posted: Apr 6, 2011 (13 years ago)
Technically you should tell your insurance company as this may count as a modification.
I think this is ok provided these wider tyres don't rub on anything - Try it on full lock when the car is loaded up.
These wider tyres will give you more grip.
The circumference will be slightly bigger too so your speedometer will read lower speeds - this might actually make the speedo more accurate as they tend to over read by about 10%. Also you will in effect have fractionally higher gearing which may even improve fuel economy.
If you want to be ultra picky you could get the tracking checked as the car will be running fractionally higher than before. This might affect the wheel alignment slightly.
255-45-17 means this:
255 is the tyre width in mm
45 is the profile (sidewall height) of the tyre, in this case the 45 means the profile is 45% of
255mm
17 is the wheel diameter size in inches.
The other thing to check is the speed rating which is a letter like H, V or Z. It's fine to have a higher speed rating but you shouldn't have a lower speed rating than the manufacturer fits.
Don't mix sizes or speed ratings on the same axle.
Cheers
I think this is ok provided these wider tyres don't rub on anything - Try it on full lock when the car is loaded up.
These wider tyres will give you more grip.
The circumference will be slightly bigger too so your speedometer will read lower speeds - this might actually make the speedo more accurate as they tend to over read by about 10%. Also you will in effect have fractionally higher gearing which may even improve fuel economy.
If you want to be ultra picky you could get the tracking checked as the car will be running fractionally higher than before. This might affect the wheel alignment slightly.
255-45-17 means this:
255 is the tyre width in mm
45 is the profile (sidewall height) of the tyre, in this case the 45 means the profile is 45% of
255mm
17 is the wheel diameter size in inches.
The other thing to check is the speed rating which is a letter like H, V or Z. It's fine to have a higher speed rating but you shouldn't have a lower speed rating than the manufacturer fits.
Don't mix sizes or speed ratings on the same axle.
Cheers
Posted Apr 6, 2011 (13 years ago)
Thanks for all that, another question - could this be why my tyre pressure sensor (on board computer) is saying 'faulty sensor'? Again thank you.
Posted Apr 6, 2011 (13 years ago)
Thanks for all that, another question - could this be why my tyre pressure sensor (on board computer) is saying 'faulty sensor'? Again thank you.
Posted Apr 6, 2011 (13 years ago)
The tyre sensor does not know what tyres are fitted it just measures the internal pressure. Maybe the sensors are faulty (its easy to break them when fitting tyres) or perhaps the wheels have been fitted on different axle or corners? The pickups in the wheels are coded to whe main ecu to tel it that this one is offside rear etc. If you fit this to the front or nearside it would register as faulty.
Posted Apr 6, 2011 (13 years ago)
completely agree with previous answers given faulty sensors common fault and as mentioned check with the insurance to as its classed as a modification to the car as its not standard fitment
Posted Apr 6, 2011 (13 years ago)
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