Optimal track widths 355/348??

I have read a lot of posts about spacers added to this car and that car for handling. Does anyone have a measurement from outside of tire to outside of tire front and rear? Thanks in adavance, Scott

I have the 225 18 front, and 295 18 rear HRE wheels, just not sure I need spacers or not!

 

I have a 95 348 spider. The wheels are HRE, not stock. Thats why I was asking for the width/track from outside edge to outside edge of tire. I think they are stock 355 offserts but not sure, Scott

 

I measured outside of wheel to outside of wheel, and I got 1907.2mm. I have 295 rear tires, so subtracting that I get 1612.2. My manual (348) says rear track should be 1628. According to the above I am under the stock track width for the rear wheels currently. So, if I buy 25mm spacers, track width would be1662.2. Maybe there is a spec for the track width on challenge cars? I don't want to go too far! Whaddya think, Scott

 

I do understand what you mean by measuring from the center of tire to center of tire.(I had it on the lift last night when I measured) I will get a helper and measure again this weekend, and post a "booty" shot as it is now. (No, not PAPs kind) ;o)

What is the max negative camber you have seen guys run on the street/track? When I post the pic you will see I have a lot. Car handles well, but it does wear the tires a little secondary to the rear camber. I have seen/heard people say it should be 1-2 degrees, but it looks like twice that to me, Scott

 

I was just curious, I'l post pics this weekend. Scott