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Does anyone know what the maximum run-out is for an 18" wheel to where it can or cannot be fixed? I had a chance to measure the wheels I took off the car for run-out and discovered the front 2 wheels were just fine, no run-out at all. The back 2 wheels however, had run-out on the inside of the wheel but were fine on the outside of the wheel. The run-out measurements were 3/32nds for one of the wheels and 4/32nds for the other. How good or bad is that? The wheel straightening place near me said they would do it for $135 per wheel but didn't say how much run-out they could correct for. It appears that 2 of my wheels are bent and 2 are not.
Not much action on your question so I'll chime in with my usual off the mark comments. I would have these questions. Is the "runout" radial or latteral? What are some measurements from a new wheel? (stock spec) Why is such a crude scale used (32nds)? It seems measurement with a dial indicator in thousandths would be used on what is, after all, a machined part.
1/8" (4/32) seems like a lot, especially if radial. Is the implication that anything less than 1/32 is OK?
It is radial, meaning that as the wheel rotates the inner lip is out of round, the outer lips are all actually fine, it is the inside edge of the wheel that has been flexed which makes sense because the outside of the wheel is where spokes are and stronger. I don't have a dial indicator as large as an 18" wheel so I put up a ruler with 32nds markings on it in two separate locations and spun the wheel taking measurements. I don't know if 4/32nds is a lot or not for an 18" wheel, that was sort of what I was asking. I don't think there is an implication than anything less than 1/32 is ok, other than to say you probably wouldn't feel it. I didn't so much feel as it was hear the issue coming from the rear of the car when these wheels were on, they created sort of a pulsing reverberation at higher speeds. The two front wheels did not appear to have any runout which also makes some sense because they are only 8" wide vs. the 10" of the rear wheels and don't have as much weight over them.
Funny enough a new orange Boxster was ordered with the factory wheels painted and it turns out the factory only paints the outer portion of the wheel, the inside is still all silver instead of being black, I took a pic I'll have to upload it..
Ken--=-Didn't realize you were measuring the runout yourself--thought it was the wheel place. Next time you are at a machine shop or rebuilder, ask to see a dial indicator. Many are not much bigger than your ignition key and you will immediately see why it would be the preferred runout measuring tool.
Agree with your reasoning about the outer part of wheel being stronger and a wider wheel more likely to sustain inner edge damage. On the other hand that elk imparted the first hit to the fronts and the car was already launched skyward by the time the rears got him. Maybe the damage occurred on your return to earth; Pavement being less resilliant than elk (as far as I know).
Linear Mode
