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STR Front Tyre size

1640 Views 7 Replies 5 Participants Last post by  Cata1yst
Hi all,

I need a new front tyre on my car which currently has Dunlop SportMaxx 245 45 18 96Y on the front. I got a price for another Sportmaxx tyre which but was told it was a 245 45 18 100Y, however having looked about I think my car should have 245 40 18 on the front.

One front tyre is very good, the other one has worn out, I dont really want to chuck the good tyre, but if they are incorrect for the car then I will.

What is everyones opinions?

Many thanks,
Stuart
1 - 8 of 8 Posts
I'd be more concerned about why you've got uneven wear on front tyres!
The last digit is the depth of the tire if that makes sense!
The previous owner may have put a deeper tire on to make the ride a little bit more comfortable!
The decision is yours as to whether you change it but obviously both sides need to be the same! If it were me, i would stick with the bigger size and have the more comfortable ride!
I'd be more concerned about why you've got uneven wear on front tyres!
I dont have uneven tyre wear, I have a nearly new tyre and an old worn out tyre!

I understand what the numbers mean on tyres, 45 profile tyres are cheaper and there seems more choice, so I think I will stick with the 45 profile tyres! I was more concerned about deviating from Jaguar's spec regarding the tyre size especially given the cars performance and just wanted reassurance that everything is ok.

Thanks peeps
Y is the speed rating (186mph)

The 96 or 100 is the load rating

96 = 710kg per tyre
100 = 800kg per tyre

I would stick with the standard profile, do not mix tyre brand, size or spec on the same axle.

And in future change your tyres in pairs, if not full sets.
Hi Jadlad;

Here information i have, my 56 plate STR has the standard 245/40 18 in wheels and the ride is very comfortable.


2002-2007 S-Type R wheels:
Front: 245/40 - 18 X 8
Tire OD: 653mm/25.7”
Rear: 275/35 18 X 9.5
Tire OD: 649mm/25.6”
Front ET/Offset: 60?
Rear ET/Offset: 49

2008 S-Type R Wheels
Front: 245/35 -19 X 8
Tire OD: 655mm/25.8”
Rear: 275/30 -19 X 9.5
Tire OD: 649mm/25.6”
Front ET/Offset: 60?
Rear ET/Offset: 49

Cheers Gos
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Y is the speed rating (186mph)

The 96 or 100 is the load rating

96 = 710kg per tyre
100 = 800kg per tyre

I would stick with the standard profile, do not mix tyre brand, size or spec on the same axle.

And in future change your tyres in pairs, if not full sets.
I have only owned the car a couple of months, I would never have different tyres on the same axel, the front passenger tyre is nearly new hence not really wanting to get rid of it, but I will change them both reverting back to the jaguars spec if its deemed necessary, hence coming on here and asking the question. I am not a cheap fly by night STR owner, I got the car reasonably cheap as I knew I had to spend some money sorting it out which is what I am doing, just don't want to spend money unnecessarily.

Thanks to all that have replied.
I have only owned the car a couple of months, I would never have different tyres on the same axel, the front passenger tyre is nearly new hence not really wanting to get rid of it, but I will change them both reverting back to the jaguars spec if its deemed necessary, hence coming on here and asking the question. I am not a cheap fly by night STR owner, I got the car reasonably cheap as I knew I had to spend some money sorting it out which is what I am doing, just don't want to spend money unnecessarily.

Thanks to all that have replied.
As above should be 245 40 18

I have front 235 40 18 (Winter) Which is acceptable according to the book/certificate of conformity/jag specs

And front 245 35 19 (Summer) - Non Standard Alloys
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