Hey guys, tell me som'n,,,,,,, I see mostly that 20" rims on our cars are 9" in width; would 20" 8.5's not work, or is it even a difference? I just need to be certain before I buy rims & get stuck with som'n I can't use...

(((I posted this on the "Wheels & tires" forum, trying to be Jaguarlitically correct, but that didn't work out so well)))

 

Hi Marque, remember to bear in mind that the offset is also important, ET35 Versus ET45 or similar will have a significant impact on how far in, or how far out the wheels sit In the wheel arch.

 

Jim!!! Thanks for that. Ok, do another question,,,,, is it a particular offset that it "should" be? I'm not looking to modify anything; I'm just wanting to take off & put on!..

 

Try this.

Wheel/Rim Size Calculator - Shows acceptable rim width range for the tyre size

 

Thanks for this Fab...

 

Hey Marque, unsure as to what offset you have on your vehicle?
It could be original or may have been changed by a previous owner at some point?
Easiest way to check?


Simply take a wheel off and look at the inside of the alloy....there will be more than a few different numbers & details there, from the manufacturer, the style, as well as bolt pattern and offset for you


Read up on offset differences and what they could mean for you......anything from the wheel sitting too far inside the fenders or too far out, both causing issues. Usually it's illegal for the wheel to sit outwith the wheel arch area, also if too far in can foul the calipers, can make the vehicle look odd and or affect stability / handling

 

I think I'm going to just keep it simple & go with some Sepangs. I wanted SENTAS, but I'm not one for hoping something works; especially something like that; in terms of my rims now, I just have factory 18" 15 spoke rims 49mm offset.

As always though Jim, I appreciate your post!..

 

Standard offset is 49.
Anything + or - 5 is still OK in terms of ride.

Best is OEM.
Sepangs are very nice and a top choice if you want to ride 20".
19" is a good alternative in terms of look and comfort.

 

This is what I was looking for! Thanks Paydase

 

Also remember a good general rule of thumb when looking for rubber, that you really shouldn't exceed wheel width with tire contact patch width. You start changing the sidewall dynamics.

 

I'm with ya there 'Box'. I'm sticking with the 255/35's on'eim!..

(Edited; typed the #'s backwards)

 

The factory 20x9's on the XJ run 255/35/R20, same size tyre as the 20x8.5's fitted to other models (XK, XF, F-Type, X351 XJ)

In factory 20's, the ones originally fitted to the X350 were all 20x9; Sepang, Callisto, Cremona, Selena.

You can fit the factory 20x8.5's from the XF, XK, X351 XJ no problem with 255/35R20.

Be wary if you are getting wheels from an XK, only the fronts will suit (the rears typically being 9.5" and the wrong offset)

 

Thanks Cambo; that's something I have been trying to research. (The actual name of all the 20" OEM wheels for the xj8)

I knew "Selena & Sepangs" but not the other 2...

 

Ok, so I want to specifically ask you guys this, because most of you here have 20" & also a Portfolio (Jim) that doesn't have the sport suspension.

I see threads always talking about the "ride quality", but never specific about whether the ride is on bumps or smooth pavements.

My question is, is the ride rough on smooth pavements? Bumps are bumps, so I don't care about that, because Heck, those feel rough with my 18's!..

 

I have to be honest, mine on 20"s is pretty damn good, all things considered and generally fairly smooth on decent roads.
Hit some subsidence or a small pothole and you'll know that you did, but it's not the end of the world. Hit some serious subsidence or a large pothole and yes, you'll feel it, but not THAT much more than on a lesser rim


I guess I know that 19"'s with more rubber, or even 18"s with even more rubber will give a better, more forgiving ride, of course.
In truth my 20"s look great on the car ( in my opinion ) and it's nowhere near a trade off as far as I'm concerned

 

Yeah I'm sorta in that same frame of mind Jim. I'm getting some for certain. Still picking between what I want tho...