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From: "Rumburg, William" <william.rumburg@cdicorp.com>
To: "'ByronMFox@aol.com'" <ByronMFox@aol.com>, lancair.list@olsusa.com
Subject: RE: LNC2 Tire Change.
Date: Wed, 14 Jun 2000 10:10:18 -0400
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> Has anyone evolved a full proof method of changing a tire without pinching
> 
> the inner tube as the wheel halves are bolted back together?
>   
	Byron -
	[The following is taken from my article on pinched tubes in the
October/November 1998 LNN]...

	As a result of a pinched nose wheel tube, I called Don Goetz and his
recommendation was to use cardboard as a liner on the rim to prevent
pinching. I removed and disassembled all three wheels and tried the
cardboard technique in a trial fashion. It would have to be very stiff
cardboard and even then, there appeared to be a good chance that the
cardboard would snag or crumple upon reassembly and that could not be seen
or detected.
	So, I developed my own technique which works 100% and is verifiable:

	1. Throw away the cardboard, you don't need it!
	2. Using plenty of talc in the tire, insert the tube and inflate it
just enough that it contacts the tire walls. Make any adjustments to
properly position it and then trial fit the rim half with the valve stem
index.
	3. Remove the rim half and inflate the tube a little more to expand
the tire side walls an additional 1/4 - 3/8 inch each. This will stiffen the
tube so that the edges of the rims will slide over the tube with less
tendency to bite and pinch. To ensure that no biting or pinching occurs,
spread a liberal amount of silicon lubricant on the tube inner radius, where
the rim edges will slide. Also spread a thin film on the rim edges
themselves (a thick, gooey silicon lubricant is best). Be careful not to
spread any lubricant on the tire or rim bead surface.
	4. The additional inflation in step #3 will make it a little
difficult to bring the rim halves sufficiently together to start the nuts on
the bolts; however, by laying the assembly on the floor, with the bottom rim
half supported by a short length of 1" x 1" wood to space the tire off the
floor. Then use a 2' or 3' length of 1" x 1" on top (spaced off the tire
wall) to press the rim halves together and start the nuts. Use an inspection
mirror and flashlight to verify the tube is not pinched (because of the
silicon, it won't be!)

	Bill Rumburg
	N403WR  (Sonic bOOm)
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