My MK1 GT6 had 5.5s on it when purchased (aftermarket). There is no problem with them fitting, although I'm not sure of the correct offset. I've run 185/70-13s with no interference and I've heard of people going to 205/60-13s on the 5.5s with little trouble.
Bottom line: The 5.5s are fine.
Here are some useful limks.
http://ejelta.com/tiresize/index.html?tiresize=155%2F80-13&minwidth=&maxwidth=&minratio=&maxratio=&minwheel=4.5&maxwheel=5.5&maxdelta=2
http://www.willtheyfit.com/index.php?width=155&aspect=80&diameter=13&wheelwidth=4.5&offset=00&width2=195&aspect2=65&diameter2=13&wheelwidth2=5.5&offset2=-13&Submit=Submit
Ciao! - Jim M
--Previous Message--
: Hey. The Spitfires run a 4.5 width rim.
: I have a set of 5.5 in the barn. Are
: these from the GT6 or someone else?
: Will they work on the GT6 or would they
: be too wide. If yes, what size tire? I
: have Spits and am building a '71 GT6.
: Thanks!
:
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