CapriRacer wrote:
JBarca wrote:
.......When we are talking "trailer" wheels what is an acceptable run out (total indicator reading) of the rim where the tire bead seats against?.........
Wheels? Mmmmmm. First, my expertise is in the rubber things. When it comes to wheels, Ihave limited experience and expertise.
But I will tell you I don't like TIR (Total Indicated Runout). The important value is the first harmonic - the best fit to the curve of a sine wave. I can't remember if a Hunter GSP9700 gives that value for the wheel or not - I'm thinking probably, because the machine does do matching.
The other half of this is that it is easier to make round wheels than it is to make round tires - and wheel's affect is greater - so the values has to be pretty small.
I'm thinking on the order of - rim only - 0.020" for the first harmonic and 0.030" for total (what Roger and I would call composite).
The question stemmed from the 0.040 TIR I measured on the stamped bore of a trailer wheel I measured the other night.
I keep hearing folks using wheel weights for balance but they do not talk about the lug centric rims we have on a trailer. My tire dealer wanted to spin balance mine using this wheel bore when I bought the Denmans. I told him it was a stamped bore, not machined like autos in relation to the lug holes. He did not understand. I asked if he had an adapter to balance it by the lugs holes and he said he thought so. However the one he had did not fit. They saw no problem balancing off this stamped hub.
I cannot see how on purpose balancing a tire by a bore that is 0.040" TIR (0.020" off center) with the center of rotation as being correct when I am supporting and rotating it by the studs. But then again I do not know the tolerance of balance for a tire.
All I could measure here is the rim which stemmed the question as if I have a dealer do this, it will be by the center hole. I have since gone to balancing beads as I cannot find someone with a hub to fit trailer wheels.
Any idea if this 0.040 TIR will matter or not?
Thanks
John
