Searched for the rim size of our XJS. Says (for '94) 7J*16, ET28, 5*120.65. Now, as I have been unsuccessful to find a complete set of Machined 5 spoke factory wheels, I am starting to think towards aftermarket wheels. My question is, 7J*16, 5*120 ET28 must be quite common, but 120.65? Does that limit the selections dramatically? Advise appreciated.

 

120.65 is correct for your car. There have been many debates as to the real world significance of the last .65mm !

More likely to be problematic is the larger-then-typical center hole that's needed to fit Jaguar hubs

Cheers
DD

 

doug is correct, i had to machine my center hole larger , used a vertical milling machine!

just have to be carefull, or check a reputable shop to do it

 

Dear Doug and Ronbos:

This information is so critical to know!! Will it not ever so slightly affect the balance of the rims if you machine mass out of them?

Paul

 

I had a set of wheels bored out as Ronbros described and had no problems with balancing.

Cheers
DD

 

It seems to me that if the material is removed evenly around the circumference of the center hole any change to the balance should be very small. Once the tires are mounted they should be balanced also, which should remedy any small discrepancy. If it can be removed evenly, the only likely problem I see is if it would weaken the wheel itself too much. I guess that would depend on the wheel design, I don't really know how much would need to be removed.

 

Tyres will effect wheel balance more than removing material from the centre bore, a 1gram difference at the centre is a lot less than a 1gram difference at the circumference.

As long as the bore is central, concentric and does not cause excessive runout you will be fine.

I bought a brand new set of BBS and had the fronts modified to fit my XJS, the guys who machined the rims did a good job, runout is less than 0.2mm at the rim edge, and most of this is probably wheel bearing clearance.

I nearly forgot it is not a good idea to bolt 5x120 PCD to a 5x120.65 this puts lateral stress on the wheel studs and can cause fatigue. You can get wobbly nuts that will allow you bolt these rims up as long as the rims you use have Acorn nuts not mag nuts. If you have mag nuts the same machine shop can re-drill the stud holes for 120.65

 

warrjon is correct, the amount removed is small .

the pic on post #3 ,i'm setting up a dial indicator to measure runout and wobble.

all was less than .005 thou. both ways!

you cannot get new tires that close,both ways, at least i couldnt.

pic of tires mounted, Yeah, probably overkill sizes.

 

I'm currently running two piece BMW E39 wheels with 5X120 bolt pattern. no problems yet and it's been about 2 years. Some people who have gone the route I did use PCD Variable nuts (Also known as wobble nuts) but I just used lug centric nuts, rather than the XJS' factory hubcentric nuts. I'm running style 19s. Super unique wheels I get lots of comments. The E39 has the same hub bore as the Jags, just be sure if you go the BMW route you're getting E39 wheels only, as the same wheel series from another model will have a smaller bore. A friend of mine used E39 M wheels which have a larger rear wheel offset. He rolled his rear fenders to accomplish this. There's plenty of great E39 wheels. Message me if you have any questions about this route.