Confused about wheel offset
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Cross-Country
Joined: Nov 2007
Posts: 72
Likes: 5
From: Orange Park
Confused about wheel offset
I am just about as confused as anyone can get.I have read alot on this subject,and it seems the more I read,the more confused I get.I have an 01 F150 supercrew,I am thinking about putting the Dick Cepek DC 1 Black wheels,17X9.They have 4.53'' backspace and -12mm offset,the tires that I am putting on them are Super Swamper SSR radials,size 35X12.50X17.Now for my question,are the wheels going to be further out from the truck than the stock or sit closer in?As in,are the wheels and tires going to stick out from the truck some,or will I be having alot of problems with them because they will be sitting closer to the frame.Any help on this would sure be appreciated.
Cargo Master
Joined: Aug 2004
Posts: 2,899
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From: Lynnwood, WA
Nope. You just didn't provide enough info. First, forget offset and use only backspace -- much simpler and less confusing. As to your question -- I don't know the BS on your current whels, nor the tire size. Assuming that the tires are about 1" - 2" narrower than 12.50", and the BS is 4" - 4.5", they'll stick out a bit more.
New User
Joined: Jul 2006
Posts: 23
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From: Woodbine, MD
Originally Posted by aurgathor
Nope. You just didn't provide enough info. First, forget offset and use only backspace -- much simpler and less confusing. As to your question -- I don't know the BS on your current whels, nor the tire size. Assuming that the tires are about 1" - 2" narrower than 12.50", and the BS is 4" - 4.5", they'll stick out a bit more.
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Cross-Country
Joined: Nov 2007
Posts: 72
Likes: 5
From: Orange Park
Diver45,I finally figured it out myself not long ago,the offset is the of a wheel is the distance from the mounting surface of the wheel to the true centerline of the rim. A positive offset means the mounting surface of the wheel is positioned in front of the true centerline of the rim / tire assembly. This in effect brings the tire in to the fender well more. Conversely, a negative offset means the mounting surface of the wheel is behind the true centerline of the rim / tire assembly. This will cause the tire to stick out away from the vehicle.Backspacing is from the part of the wheel that touches the rotor or drum,whichever,that will determin how far the wheel sticks out from truck,if you should have 4 1/2 backspacing on your stock wheels,if you were to get 4'' backspacing,that means the wheel will stick out from the truck more,if you got 5'' backspacing,that means it will be inside the fender well more.
