Well finally sorted a car and was wandering if someone might be able to help me out on some wheel specs. have to decide on buying either 4.5 mangels and run 145/65/15's. or 5.0 BRM's and run with 165/50/15. Anyone no which would tuck better on a 71 fastback.once lowered. cheers !!!!!!
Have done the 175/65/15 on 5.5 before to me a little too wide.

Hey

Im running 195/50/15 on empi 8's, 5.5

maybe try this calculator

http://www.miata.net/garage/tirecalc.html 

and compare heights, the 165.60/15 are .9 of an inch lower..

My sister tried to fit 5" BRM four spokes on the rear of her notch and they were too wide.4.5" fitted on the front though.

Also use this

http://www.1010tires.com/WheelOffsetCalculator.asp 

You need to know the ET (offset) of the wheels you have and want
Then this will tell you how much movement you will get