Stock wheel size and backspacing?
#1
Stock wheel size and backspacing?
I am kind of new at this so if I sound like I don't know much, it's because I don't. However, I am doing lots of research and learning fast.
I want to install a Fabtech 3&1/2" lift kit to my 2002 F150 XL 2WD. The Fabtech representative tells me I can get away with 305/70 R16 as long as I have at least 4 3/8" backspacing and 16" X 8" wheels. That might be a little wider than I want so I am considering 285/75 R16. Anyhow, how exactly do I find out the backspacing and the width of my wheel. Yes, I already measurd the width with a tape measure as best as I could and it seems that it is barely 8" from outside to outside. That's not the right measuremant though, is it. . .probably inside dimmensions?
The current tires are stock that came with the truck, 255/70 R16 on 16" wheels. No wheel width is supplied. In a nut shell, I'd like to switch to the 285/75 R16 without having to replace the stock rims and still use the lift kit. Can It be done?:-X12
Damon
KC5AOS
I want to install a Fabtech 3&1/2" lift kit to my 2002 F150 XL 2WD. The Fabtech representative tells me I can get away with 305/70 R16 as long as I have at least 4 3/8" backspacing and 16" X 8" wheels. That might be a little wider than I want so I am considering 285/75 R16. Anyhow, how exactly do I find out the backspacing and the width of my wheel. Yes, I already measurd the width with a tape measure as best as I could and it seems that it is barely 8" from outside to outside. That's not the right measuremant though, is it. . .probably inside dimmensions?
The current tires are stock that came with the truck, 255/70 R16 on 16" wheels. No wheel width is supplied. In a nut shell, I'd like to switch to the 285/75 R16 without having to replace the stock rims and still use the lift kit. Can It be done?:-X12
Damon
KC5AOS
#2
Stock wheel size and backspacing?
To measure the back spacing remove the tire/wheel from the truck. Lay it face down on the floor.
Place a straight edge across the bead area of the wheel. Be sure that it rests on the wheel, not the tire. Measure the distance from where the backside of the wheel contacts the hub (between two lug holes) to the bottom of the straight edge. That will be your backspace.
Width is measured using the inside edges of the bead area. To be accurate you have to dismount the tire, but if it measures slightly under 8 inches you probably have 7" wheels.
Hope this helps
Cliff
Place a straight edge across the bead area of the wheel. Be sure that it rests on the wheel, not the tire. Measure the distance from where the backside of the wheel contacts the hub (between two lug holes) to the bottom of the straight edge. That will be your backspace.
Width is measured using the inside edges of the bead area. To be accurate you have to dismount the tire, but if it measures slightly under 8 inches you probably have 7" wheels.
Hope this helps
Cliff
#3
Stock wheel size and backspacing?
Do you think I can get away with 285/75 R16 on the 7" (or 7 1/2") stock rim? My thinking is that the 305/70 R16 is a little over an inch wider tire than the 285/75 R16, so that would explain the extra 1" rim width for functionality and fit. The 285/75 R16 is just under an inch thinner so it should work on the thinner stock rim, right? And, the 285/75 R16 is only apx 1" wider than the 255/70 R16 I have now. Since I don't need the wider 305 tire, it would be nice to use the stock rim to upgrade to the 285/75 R16 tire.
Help me!
Help me!
#6
Stock wheel size and backspacing?
I will be thinking the same thing when it is time for new tires, check out www.tirerack.com. If you go thru the "shop by brand" section and pick a tire, it will give you a chart for each brand that shows size, rims sizes, overall widths etc. For a Goodyear ATS, it says you need 7.5-9" rims for a 285/75/16 tire. Also inside the drivers door should be a sticker with the original tire and rim sizes along with the recommended pressure weights etc. This should tell you what size rims you have. If they are 7" (mine are) the biggest tire recommended by the chart is 265/75/16. Good luck and let us know which way you go.
#7
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#8
Stock wheel size and backspacing?
I know most ,if not all, of the charts say I should move up to a 7 1/2" rim for the 285/75's but I known people who have run them on 7's.
BigB99, it's good to here there is another person out there who is running them with no probs. No lipping when cutting sharp curves on rough terrain? How about pressure loss, normal once a month or every 2 fill ups?
MY375HP302, yes it is white, standard utility truck. Couldn't pass up the deal, $12,500 for a new 2002 with only 19 miles. I am looking to add a 2003 F250 to my insurrance bill soon. I am keeping the 150.
BigB99, it's good to here there is another person out there who is running them with no probs. No lipping when cutting sharp curves on rough terrain? How about pressure loss, normal once a month or every 2 fill ups?
MY375HP302, yes it is white, standard utility truck. Couldn't pass up the deal, $12,500 for a new 2002 with only 19 miles. I am looking to add a 2003 F250 to my insurrance bill soon. I am keeping the 150.
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