Radial Tire Tubes

[MGTD2@aol.com]

I'm switching to radials on the TD and I have four tubes, but I think they 
are the wrong size.  Anyone know off hand the "size designation" for a radial 
tube to go into a 15-inch tire.  I suspect it has a "15" in it, but what do 
the letters on tube sizes mean?  And which letters am I interested in?
Thanks.
--John Deikis

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