Is the bolt circle on brake rotor different than the wheel?

[kray-z-1]

Ok - what am I missing here?

The standard bolt pattern on the 1973 240Z is 4 - 4.5 (114.3mm) - but the rotors in all the places I've looked show a bolt circle of 4 - 103mm.

Do they measure the pattern differently on a rotor than they do on a wheel?

I do not want to order rotors and have them not fit.

Any info would be appreciated!

[jmortensen]

Z rotors bolt to the back of the hub, they don't slide over the lug studs. The patterns are different.

[Mikez73]

That's the correct disc. The wheel pitch circle diameter is 114.3mm. The hub pitch circle diameter is 103mm

[kray-z-1]

Thanks guys!

Kinda figured I was missing something.

I installed the new su's from Ztherapy (worked great btw)....so now I can go fast....I just need to work on the brakes so I can stop....it's always something!

Thanks again.