Hub and rotor re-drilling

[Right on the Mark]

Correct me if wrong but aren't the center bores on the hubs different sizes between the mark viii and mustang? If you have mustang hubs in front no centering ring would be needed..I get that..however in the rear since I'd be using stock mark hubs (redrilled) wouldn't you need the centering ring to make up the size difference for the hub center? The center of the hub is what "centers" and holds the wheel in place when its mounted..not the lug holes. And yes I realize I used the word "center" like 5 times in one breath lol

If the lugs have any angle on them or a shank that goes into rim they center the rim. I made all centering rings for my rear cobra rotors and rims on mk8 hubs but thats because I use flat lugnuts. You can search my name and see every single ? here shown in right ups. FYI most drag cars at track don't use any hub centric rings to center rims the use shank type lugs.

 

[SATURN5]

Where have you found rear Cobra hubs for $80? I will order them this weekend for that price. Cheapest I have seen is summit for $155 with free shipping. Already got an extra set of axle stubs from the junk yard to press them into to make the swap go a little quicker.

Post is three years old.

 

[chris2523]

m maker has corrected my info. please see below.

 

[m_maker]

Correct me if wrong but aren't the center bores on the hubs different sizes between the mark viii and mustang? If you have mustang hubs in front no centering ring would be needed..I get that..however in the rear since I'd be using stock mark hubs (redrilled) wouldn't you need the centering ring to make up the size difference for the hub center? The center of the hub is what "centers" and holds the wheel in place when its mounted..not the lug holes. And yes I realize I used the word "center" like 5 times in one breath lol

All OEM Mark VIII wheels as well as OEM Cobra wheels are hubcentric. It doesn't matter what lug nuts they use, they center via the HUB

In the front, mark viii uses a step hub, where the rotor has a bore of approx 70.80mm and the wheel has a bore of 63.90mm. Once you swap to front cobra hubs, the wheel bore increases to 70.80mm and is equal to rotor bore.

In the rear, the hub is sized 63.90mm for both the rotor, and wheel.
If you reuse (re-drill) your rear mark viii hubs, you will need a hubcentric ring for the mustang wheel as the wheel bore is 70.80mm. The mark viii rotor will center just fine as it did before.

Lug centric wheels have tendency to vibrate a lot more than hub centric wheels. It might be fine for drag cars, but not for a daily driven car.
Do it right and either use a cobra rear hub and corresponding rotor, or use a centering ring. That's the way it was designed to be.

 

[keVIIIn]

All OEM Mark VIII wheels as well as OEM Cobra wheels are hubcentric. It doesn't matter what lug nuts they use, they center via the HUB

In the front, mark viii uses a step hub, where the rotor has a bore of approx 70.80mm and the wheel has a bore of 63.90mm. Once you swap to front cobra hubs, the wheel bore increases to 70.80mm and is equal to rotor bore.

In the rear, the hub is sized 63.90mm for both the rotor, and wheel.
If you reuse (re-drill) your rear mark viii hubs, you will need a hubcentric ring for the mustang wheel as the wheel bore is 70.80mm. The mark viii rotor will center just fine as it did before.

Lug centric wheels have tendency to vibrate a lot more than hub centric wheels. It might be fine for drag cars, but not for a daily driven car.
Do it right and either use a cobra rear hub and corresponding rotor, or use a centering ring. That's the way it was designed to be.

Ok..you guys realize you're saying opposite things here right?? Just to avoid confusion we should remove the wrong info or just edit it. But thank you m maker..very good info here I get it now..its hard trying to picture what some of you are describing but I understand now..I did not know the fronts had a stepped hub with a different dimension at the rotor bore vs the wheel bore. Again, thanks for the input guys!

 

[chris2523]

ok so if there is a mismatch in the centering, do the lugs just disagree with the centering ring and something moves slightly? or what.

i also didn't know about the step in the front mark hubs. i just took my hubs off and tossed them, never gave them a second look.

 

[m_maker]

ok so if there is a mismatch in the centering, do the lugs just disagree with the centering ring and something moves slightly? or what.

Not sure what you're saying here, but once the wheel is centered via the hub, the lugs just center the stud in the lug bore ?

Lugs will approx. center the wheel if the wheel bore doesn't match the hub, but would you rather depend on a center axis alignment or lug alignment ? Does the wheel spin in the center axis or lug axis ?

I assume you have no centering ring in the rear of your 03 Cobra wheels ? If so, you can do a simple test. Measure the run out of the front wheel (which is hub centric since you have the correct mustang hubs in the front) vs the runout of the rear wheel (which was lug centered via lug shanks). You will be surprised. You might not feel it while driving since the front wheels are true, but I'll bet a dollar (ok two) that the rear wheels are not.

i also didn't know about the step in the front mark hubs. i just took my hubs off and tossed them, never gave them a second look.