What's a reasonable rim runout limit?

[gsxrken]

I just got a Starrett dial indicator and, since the rear of the 930 is on jack stands anyway, decided to try it out on my rear rims. I placed the gauge plunger out as far as i could on the rim near the tire

The RH rim varied from 0 to -.015 and then to +.005. So a total swing of .020.
The LH side was better; it went from zero to -.012 and back. So total of .012.

I intend to measure the fronts too, but I am interested in what the spec is.
I understand that I am measuring total "installed runout" (my words) and that the observed runout might not be all rim related.

What's the outside limit I should be looking for? When is it noticeable in a vibration or wobble?

[gsxrken]

Ttt

[porsche930dude]

if you need a dial indicator to see the runout than its not a problem

[swade]

According to the Technical Specifications book 78-81 930:

Max permissable radial runout for steel rims 1.25mm
Max permissable radial runout for alloy rims 1.0mm
Max permissable lateral runout for steel rims 1.25mm
Max permissable lateral runout for alloy rims 0.80mm
Max permissable radial and lateral runout for rim + tire 1.50mm

Great little books

[E Sully]

HUNTER Measuring the wheel's runout

[gsxrken]

Thanks for the specs and the link. Looking for that Tech Specs printing now.
Cheers.

[DennisMenace]

Hi guys, I just measured the lateral runout of my front right hub assembly after changing the bearing races and wheel bearings. 0.08 mm seems a bit much to me. What is your take? Unfortunately the car won’t be back on the road until spring since it is undergoing several projects..

https://youtube.com/shorts/aJUw84VLK6k?si=sB-Nvwf09SFC21me

Car is a 1985 Carrera 3.2

[PeteKz]

That's about .003". Fuhgedaboudit.