[changzuki]

**** Adding a couple of notes that go along with the above posting concerning wheels.
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New 15" wheels are readily available for Spitfires by a few manufacturers. And if a low profile tire is used, Centurion's rear wheel wells will house them. The front's will too but be sure to get the correct offset or they'll scrub on the turns. Normal driving shouldn't pose any issues. However, if you are planning to follow some of the General Lee's stunts then it's going to be really close when you bottom out the front suspension.
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15" wheels can also give a higher top speed or same speed while lowering the rpms a bit albeit at the expense of some extra weight.
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If considering this upgrade, also consider upgrading the factory wheel studs. Spitfire use some of the smallest I've dealt with and of all things, the wheels are "lug centric" not "hub centric" - meaning the lugs center the wheel in addition to dealing with other torsional stresses.. The originals for this 1966 base are (3/8"-24) 17mm Hex. It's all these little things that add up and help to give Centurion it's very light weight. Substitute wheel studs have been successfully used and there's an excellent write-up online at:
Upgrading Triumph Spitfire Wheel Studs
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~ CrazyJerry