The 145s are more expensive because it is a specialty size that no one wants
anymore except people with bugeyes (that they want to keep stock) and maybe
Fiats or early Spitfires or whatever.
All other things being equal the 155s should handle a little better than the
145s. The 145s may feel a little more light and nimble, the 155s a little
better grip (and by the way, if you haven't driven your bugeye yet it will
feel quite light and nimble compared to most anything else on the road with
either tire).
The Sprite can handle the 155s and certianly not be "over tired" with them.
If your goal is strict originality go with the 145s, otherwise the 155 size
would probably be the way to go.
Greg Lemon
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