How to measure Wheel Stud Circle Runout

[@1966johnnywayne]

This is a great video with an excellent demo of the procedure for checking stud runout, however I can assure you that flange drilled holes are not running out .004". The holes are precision machined and will be located within +/- .0001" of true position...the studs are the weak link.The studs are roll formed, like the cheapest common bolt, knurled and pressed into the holes, they can easily locate several thousandths of an inch off center, as well as not being square to the hub mating surface due to their irregular shoulder up against the backside of the hub.

[@geojor]

valuable diagnostic tool, thank you...

[@dangerdavefreestyle]

how much runout did the vehicle have which you were talking about?

[@JonDoe-007]

So if I have stock wheels that remain hub-centric then no need to worry about possible stud runout?

[@MTECIndustries]

What snap on tool model is this? Thanks in advance!

[@alimorris2002]

I imagine the same problem with the drive shaft of my car, specifically the rear right brake locks up with a little more pressure at low speeds and I have checked and tested all the brake parts and it is a problem It does not exist in them

[@SirDeanosity]

I have steering wheel wiggle on my Dodge Grand Caravan. I am sure this video explains the cause as the place that replaced the tires re balanced the tires yet the wiggle remains.

[@KLeVoyBarnes]

And if there is a dismantling or testing like this I like to mark the first stud. This defect of run-out will be magnified out at the outer circumference of the tire. Ya ever since you worked on my car the radio doesn't work wipers intermittent delay timing was different than now : - )

[@LynxStarAuto]

Very true about the paint match. My problem is, I don't trust anyone's work but mine, so I go through my own trouble of measuring, and if matches, GREAT! Good to know the industry is not totally full of incompetent idiots.

[@flineman]

'there are a lot of variables in this process the axle bearing surface may not be concentric with the center line of the axle? the studs may not be perfectly round? they may have move off center when pressed into the hub. Seems you would first have to prove the axle bearing surface then the holes in the hub then the roundness of the studs themselves and if the studs are truly perpendicular to the hub and i am probably missing several other variables.

[@tradersnotion]

My first thoughts as well.

[@WeberAuto]

Hi, all good thoughts, thank you. When diagnosing tire speed related vibration issues on a vehicle, if the tire and wheel assembly has excessive radial runout on the car, but not off of the car, the axle and stud circle must be checked. I have a separate video on measuring axle runout. If the axle face and hub runout are okay, the stud circle runout must be considered. Measuring this runout next to the axle face eliminates non-perpendicular stud issues. In my experience, mis-drilled (non-concentric) holes are typically the cause of the problem.

[@alfredohernandez3120]

Based on my experience with inspection/balancing PM rotors and rotordynamic theory, the physical runout(surface runout) almost never matches the actual rotor imbalance(harmonics). But in this application, this methid might be close/good enough.

[@mistoperator]

I would have checked the first one again to prove dial indicator zero

[@WeberAuto]

Good point

[@فضلالهدهد-ه4ج]

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