Guysdigdirt

My son and I are trying to revive a 65 couple with an I6, manual steering, automatic transmission and drum brakes. We want to convert the front to disc brakes and stay with the 4x114.3 4 lug pattern. We will likely use Scarebird to do this.

We have been doing our research and have found a table that says we can use wheels that are 15x7 with a 4.25 backspace and tires that are P225/60R15.

http://www.allfordmustangs.com/photo...hp?photo=33125

So we are thinking we will use wheels that are 15x7 with a 0 offset and 4 inch backspace. For the tires we will use the recommended P225/60R15 from the chart. So we are spot on the recommendations with the exception of the backspace, which is 4 vs the recommended 4.25. I have not been able to find the 15x7 with a 4.25 backspace.

I am wondering if the difference in the backspace is going to cause a problem. It is only .25 inch so I think it should be fine, but would really like someone to either confirm my thoughts are correct. Or tell me I am wrong and what I should do differently. Any help and guidance would be much appreciated.

guitarman376

You will probably be fine.

Guysdigdirt

Someone told me that 15x7 will be too much of a power drag. Anyone have thoughts on that? They said I should go with 15x5.5.

Guysdigdirt

It makes sense that the wheels alone will not create an issue if compensation is made in the tires. So if I use 15x7 wheels and tires that are P225/60R15, will I be in the right ballpark? Reminder, I have an I6 and do not plan to make a change.

I guess the bottom line is, if I use the setup I listed, will it create a measurable decrease in power and/or will it mess with anything else like the gears, speedo, or anything else?

Thank you again for the help everyone.

groho

my wheels are 4.25" backspacing and sometimes rub on the very front edge of my front fenders in turns, but that's about it. If you're stock suspension height, you should be fine.

Guysdigdirt

Thanks again everyone. Have a great weekend.