Pinto Car Club of America
Shiny is Good! => General Pinto Talk => Topic started by: Handy on September 22, 2004, 08:28:47 AM
Hi all,
While browsing ebay looking for a set of rims I noticed an ad that provided a little extra info on other cars with 4-Lug rims. I just converted the description the ad provided to text and wanted to offer it up to anyone interested. Hope it helps someone else. If someone could explain what "offset" "centerbore," and "lug size" means for Pintos from this list, I'd appreciate it.
The text was a bit jumbled when I downloaded it. I'll take a stab at it though.
Manufacturer, Model, Year are the obvious.
Size is the diameter and width of the wheel.
Offset is how far the mounting face of the wheel is moved from center. Place the wheel upside down so the brake is facing you. Find something straight and flat (i.e. yardstick, broom, section of pipe) and lay it across the top of the wheel. Take a ruler and measure from the mounting flange of the wheel to the bottom of to object lying on top of it. This is the backspace of the wheel. A 6" wheel with 3" of backspace would have the mounting flange directly in the middle of the wheel. This wheel has an offset of 0mm. If you have a 6" wheel with 4" of backspace (I think that's what a stock pinto is) the mounting flange is 1" to the outside of the center of the wheel. This wheel has an offset of +25.4mm. A wheel can also have negative offset. Racers who have big slicks and a narrowed rearend usually have negative offset.
Remember: A 6" wheel with +25.4mm offset and an 8" wheel with +25.4mm of offset do not have the same backspace.
Centerbore is how big the hole in the middle is to fit over the hub. The Pinto's hub is 2.5"/63.5mm. A larger centerbore will fit, a smaller centerbore will not. As long as the centerbore isn't too small, the size doesn't really matter too much unless the wheel is hubcentric. This means the hub instead of the lugnuts locates the wheel. The only time I ever came across this is because I run circle track wheels on my car.
Lug size is the size of studs the wheel is designed for. I know the pinto has 1/2" R studs. Most wheels use a tapered seat lugnut (stocks do), but some aftermarkets may require flat shoulder lugs.
Here are some other topics about different wheels fitting on Pintos.
http://www.fordpinto.com/yabbse/index.php/topic,808.0.html
http://www.fordpinto.com/yabbse/index.php/topic,1088.0.html
http://www.fordpinto.com/yabbse/index.php/topic,844.0.html
http://www.fordpinto.com/yabbse/index.php/topic,882.0.html
http://www.fordpinto.com/yabbse/index.php/topic,74.0.html
Thanks for the info. Unfortunately, I couldn't adjust the text to look right even after 3 tries >:(
It looks beautiful in Excel and MS-Word.