tubes in Radial tires ?

["Dan Furbish" <BarnOwl@world.std.com>]

A friend  asked me my opinion about putting a tire tube inside 
a radial tire.
My initial thought was, I heard once upon a time that it wasn't
a good idea; but I really don't know why, or where I heard it.
(should it be done, is it safe ?)

Can someone please elaborate on this for me.
TIA. 

Dan 
68 MGBGT 
in Massachusetts

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