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Ford Panther Platform Wheel Widening - Build A Panther Part 6 The Wheel Widening Edition

Wheel Widening for the Crown Victoria

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“Holy s*#@! That thing looks siiiick!
K.J. Jones, Tech Editor, 5.0 Mustang



Checking Offset/Backspace

There are a variety of ways to determine just how wide a wheel and tire package you can fit on your car. Here is process I used.

I found a good tire size comparison tool online at RimsNTires.com/specs.jsp that allows you to compare prospective wheel and tire combinations to what's on your car now. For this to work, you need to know your tire size (no biggie-it's molded into the tires) and the diameter, width, and offset of your existing wheels. Tire Rack will have specs for your stock wheels. Using the tire comparison tool, I plugged in my stock specs and then tried several combinations of section widths and aspect ratios to come up with a tire that was about 2 inches wider and within an inch of overall diameter of my stock tires. In my case, the 225mm section width is approximately 8.9 inches wide. A 285mm tire is approximately 11.2 inches wide. To determine the correct offset and backspace for the new wheels, I used Tire Rack's specs for my stock wheels: 16x7 ET50 (ET50 means 50mm positive offset-the hub flange is 50 mm outboard of the wheel's centerline). According to the tire comparison tool, this is equivalent to a 5.9-inch backspace. Knowing I could increase the overall package by about an inch inboard, and factoring a 285/40 tire mounted on a 17x9 wheel, a 37mm offset equates to 6.5 inches of backspace.

Parts List

Description PN Source Price
17x7.5 10-slot wheel (set of four) STL03670 Rock Auto $383.16
Widening two steel wheels to 9 inches N/A Pico Wheel & Tire 180.00
Kumho Ecsta ASX 245/45R17 (pair) N/A Performance Plus 266.00
Kumho Ecsta ASX 285/40R17 (pair) N/A Performance Plus 360.00
Mount and balance four tires N/A Performance Plus 79.00
Wheel alignment N/A Just Tires 79.00
Total $1,347.16

SOURCES
Rock Auto
6680 Odana Road
Madison
WI  53719
866-762-5288
http://www.rockauto.com
Pico Wheel & Tire
North Hollywood
CA
818-982-0375
Performance Plus Tire & Automotive
3910 Cherry Ave
Long Beach
CA  90807
562-988-0211
www.performanceplustire.com
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