Has anyone run the tires sizes 255/35/20 with 295/35/20? I want to fill out the rear wheel well better and I'm not wanting to let

I plan to change the wheels and tires in about 2 weeks.

 

What rims do you have? The standard Senta 20" rims are 8.5" front & 9.5" rear.

My car runs 295/30/20 on the rear, but it has 10.5" Vortex rims. Fronts are 255/35/20 on 9" rims.

 

I'm not sure of the name of the wheels but I have the 175 edition. I mounted the 295/35/20 today and I like how it fills out the wheel well.

 

They're Kasuga rims - 9" front, 10" rear. I believe the standard rears are 285/30/20, so by going to 295/35/20, you've increased the rolling radius by 5% - that means your road speed will be 5% higher than the speedo indicates. If you have a GPS, it would pay to check indicated vs. actual speed, just to be sure you don't start picking up tickets. Also, you will have increased the ride height by 0.7". There's a useful calculator here:

Visual Tyre Size Calculator | Kouki Tech

My guess is that, with the taller sidewalls allowing more tyre flex and the increased ride height, you may find the rear a bit more 'loose' than before, but I don't know how pronounced the effect will be.

 

Can't help but notice your calipers are not "red". The 175 came with the optioned red calipers. Where the calipers replaced? Would like to see some pictures of how the over sized tires fit. What brand of tire did you go with? Did you check out other brands?


Just zoomed in on the wheels and noticed the red calipers (they look like they have a lot of dust on them). Sorry for the confusion. Pictures of over sized tires would be appreciated.

 

Aren't the diameters the same regardless of 19 or 20"?

 

Thank you for the responses guys and I'm not new to cars and how tires sizes change speedo, performance etc. I just wanted to know if the tire is too tall and would cause issues or rubbing because max tire diameter on our cars is listed by discount tire as 27.3" and the 295/35/20 is roughly 28.2".

So far I haven't had any issues with rubbing and I love the look. I don't want to lower the car and the taller tire closes the fender gap a bit so it looks much better. Plus I can't stand when the front sidewall is thicker then the back even if only by a quarter inch. Ill post close up pics in a few min.

 

Nitto envo 255/35/20 295/35/20

 

Fair enough - not everyone's aware of such things, just wanted to warn you.

By the way, I hadn't realised the XKR 175 wasn't lowered like the XKR 75. You guys were short-changed - we got the lower, stiffer suspension, sharper steering and 20 hp extra. Mind you, I guess the price uplift was correspondingly larger (£10k premium over standard XKR here).

 

I knew the 75 had 20 more hp but not all the other extras.... That sucks! Lol.

I've been trying to add a close up pic if the wheel/tire but its not allowing me to do so.

I actually like the 75 better then the 175. I love the 75 wheels and I don't like the 175 wheels.

 

Yeah, those vortex ones are the best OEM wheel Jag has come out with for the X150. They originally came out on the 08 XKR-S, another Europe only model... 10.5 inches wide in the back!

 

Just to annoy you further :

It also has 5% more torque, tweaked Active Dynamics and Active Diff, and a modified exhaust (which I think is the same as the XKR-S) which gets LOUD when you twist its tail a bit and has a wicked crackle on the over-run. It has a more 'muscle car' sound and feel than the standard XKR, and the handling is excellent.

 

You're just mean!!! Lol

 

Here's a close up of the rear tire 295/35/20

 

Do you know the back spacing/ offset of these wheels? Are you certain of the wigth? I might buy different wheels but there isn't many that fit the big brakes.

Thank you

 

If you mean the Kasugas, here are the specs:

Offset: front ET46, rear ET49
Stud Diameter: 108
Rim Width: front 9J, rear 10J

For the Vortex:

Offset: dunno, not in the manual
Stud Diameter: 108
Rim Width: front 9J, rear 10.5J

One thing I have discovered - the Vortex rims were fitted to the 2008 XKR-S 4.2 as well as the XKR 75. However, they don't seem to be painted. Here's some for sale:

Vortex 20" XKR-S

 

I recently had Michelin Pilot Super Sport tires installed on my XKR-S: 265/35/ZR20 and 305/30/ZR20. The 10 mm extra width both front and rear over the stock size not only looks great, but fits without any clearance problems.

The overall diameter of the new tires are only 0.1" greater in front and 0.2" greater at the rear. Because the new tires are between 99.75% (front) and 99.25% (rear) of the stock size, speedometer error should not be a concern.

Tire weight is the same for the front tires and just 1.5 lbs heaver than stock for the rear, so the active suspension and ABS calibrations should not be adversly affected.

As expected from their use on prior vehicles, the Michelin's are both quieter and slightly more responsive then the Pirelli P Zero's that were original equipment.

 

Useful to know, since the same boots should fit the Vortex wheels on my 75. And, frankly, it could do with a bit more rubber at the back.

 

Pictures please

 

Pictures please! What rims do you have on your XKR? The stock rims on the XKR-S and XKR with dynamic pack are .5 " wider and the stock tires are wider with 295 rears. I wonder if one can go even wider on these rims? The 75 may also have wider rims but the 175 is standard with 285 rears.

Sorry just re-read your post and I see you have the XKR-S. I bet the new tires make a big difference. The PSS tires are the best! A friend with a GTR had 355 rears and, I think 285 front, installed and said they made a huge difference in ride quality, comfort and handling, over the stock run flats. He took me for a drive; man do they grip. The GT-R, although much rougher than the XKR-S wasn't that bad. Pictures. Pictures. Pictures...