What bolt pattern does my '66 mustang have, is it a 4.5" bolt circle? Sorry maybe a dumb question, but I'm FINALLY picking it up tomorrow after it got worked on and is driveable. Also what does the different tire sizes mean on rims like 14x7 and 15x7? I don't know much at all about tires or rims. Thanks!

 

225/60/15 is a good size for your 15x7. I asked a similiar question awhile ago a Norm answered most eveything you need to know about wheels and tires. https://mustangforums.com/m_3034399/tm.htm

Or you could go check out dodgestang's chart in the FAQ.

 

Depends on the backspacing on the 15x7