Charles, The tyres will bo 7.25 inches across the flanges so I was planning on 0.007 inches of interference. Good point about alignment - I intend to lay the tyre on two horizontal bars about 4" apart, heat up the tyre then lower the wheel set ( the wheels are already on the axles) into the tyre. Both wheel and tyre should rest on the horizontal bars. Barrie ----- Original Message ----- From: <cbrumbelow@xxxxxxxxxxx> To: <modeleng@xxxxxxxxxxxxx> Sent: Thursday, November 17, 2005 10:48 PM Subject: [modeleng] Re: Steel Wheels > Be sure your assembly arrangement allows time to get the tyres/tires on > and lined up before the temperature difference is gone. It might be well > to leave the exteriors of the tires enough oversize to allow truing cuts > once everything has been assembled. Some might even suggest that the > final truing take place between centers with the tires on the wheels and > the wheels on the axles. And, you might want to match each tire to a > specific wheel center as you turn the sets. Am I reading correctly that > you will have wheel centers of a nominal 8" diameter and an interfereance > fit of 0.008 inches? Charles > -------------- Original message -------------- > MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.