Can anyone tell me the exact front rotor size for my 2000 non-Brembo XJR .

I even called the dealer for the VIN# check and they were NOT 100% sure!!

The tech-guy (who is really from UK) said XJR "should" come with a bigger performance non-brembo caliper and 325 mm for Year 2000 model

It did not sound all convincing,

can anyone tell me the size please?

thanks

 

On my non-Brembo 2000 XJR (US model) the front rotors are 12.8"/325mm.

Hope this helps

 

sure, it helps, that answers my question ,thanks

but my question is ( excuse my ignorance) does 305 and 325 make difference ?

 

Yes, it'll make a difference. The XJ8 used the 305mm rotor. So if you had tried to use a 305 rotor with your XJR's calipers, half your pad would be hanging above the outside edge of the rotor since the caliper sits further from the hub centerline as it's set up for the larger diameter rotor.

A larger diameter rotor also gives better braking performance since the moment arm the brake is acting on is effectively longer.

A larger diameter rotor is also more effective because it gives greater thermal mass to be able to absorb more heat and also gives more area to be able to dissapate that heat from, so they are more resistant to fade. Also, I think the XJ8 used a slightly thinner rotor as well, which has less fade resistance and is also more prone to warping.

So basically, unless you changed to the XJ8 calipers, you physically couldn't use the 305mm rotors, and you wouldn't want to anyway, as the XJRs larger system is MUCH better in any case.

 

As above

XJ8 = 305MM BY 28MM Width

XJR none Brembo = 325MM BY 30MM Width

XJR Brembo = 355MM BY 32MM Width

I think.....

 

thank you ,guys

 

Sorry to revive old thread but I have 2000 xj8 vdp can I use 325mm front rotors? I know from the factory it uses a 305mm front/rear rotors and the XJR uses 325 front/305 rear rotors.

Would I be able to use the bigger rotors on my xj8? Thanks

 

Sure, you'd just have to switch to the XJR calipers and pads so the mounting height and caliper width was correct. It's not a bad idea, the VDP is pretty heavy, and if you need calipers anyway...