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LAST EDITED ON 15-Jan-01 AT 07:50 PM (PST) Actually, centrebores are not universal.
Ours is 67.1mm, which is actually larger than almost all other cars (Honda's are 56.1 or 64.1, Nissan 66.1, Toyota 54.1 or 60.1).
You can put a wheel from a car with a large centerbore on a car with a smaller one, but not the other way. The workaround is to have the bore enlarged, which can be done at a qualified machine shop. Note that the designs of some wheels may not work too well with this, especially if the original wheel has a very much smaller centerbore than the target vehicle.
Aftermarket wheel vendors deal with this by putting huge cennterbores (70-72mm) on their wheels, and supplying plastic or aluminum hubcentric adapters to fit the customers car.
This means that a lot of cars can use our wheels (as long as they have 5x114.3 bolt pattern), but we can't use many others. As a point of note, the 3G RX7 uses a 67.1 mm centerbore, which is why it makes such a good upgrade for us. The 2G Probe / MX6 is also good, and in fact better for most as the 16x7 size has less fitment issues than the 16x8 '7 wheels. Its too bad they are over 23lbs each.
So, the important things to consider when getting different wheels are:
- bolt pattern
- offset
- width
- centerbore
One final note is that if the centerbores don't match, the wheel will become a 'lug-centric' fit instead of 'hub-centric'. This can cause vibrations at speed if the wheels are slightly off- center, and places higher than design shear stresses on the lug bolts. This can potentially cause a catastrophic failure, although I haven't come across any reports of that actually happening. Just take the usual precautions of not over-torquing lug nuts, checking for tightness periodically, and perhaps replacing the bolts altogether if they are old.
juan
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