What is Wheel Offset and Backspace?

Wheel offset anTech Article on Offsetd backspace measure the same thing but in a little different way. They tell you where in the wheel well a particular wheel will sit.

Offset is a measurement in millimeters from the backside of the mounting plate to the center line of the wheel. A positive number puts the mounting plate further away from the backside of the rim. A negative measurement moves it closer to the backside. Since offset is based on the center line, the width does factor in. That is to say an 8-inch wide +45mm offset and 7-inch wide +45mm offset results in a 1/2" difference in wheel positioning. The 8-inch wide will be further into the wheel well. To gain a better understanding of the offset of a wheel, read our tech article on this topic.

Backspace measures the distance from the mounting plate to the back edge of the wheel.  The higher the backspace the further into the fender well it will sit.

Confusing? It can be. The good news is Tire Rack takes care of all the guesswork for you. When you shop by vehicle, we'll show you options that fit your vehicle. In some instances, there may be a fitment note explaining any potential issues, but in most cases no modifications are needed.


Tuesday, February 28, 2012 by Patrick Moore

I currently own a 2009 Chevrolet Tahoe, 2WD, LTZ (Flex Fuel). I have been shopping around for a set of 22" wheels and tires but have been confused by the different "offset" options. I have been told that a 305-40-22 tire is optimal but the wheel width and offset is confusing me. Could you possibly provide some information that will enlighten me on this matter? Thanks in advance for your help.
Tuesday, February 28, 2012 by hunter

Hi Patrick,
The great part of how Tire Rack makes wheel recommendations is we take all of the hard work out of the equation. You can do a shop by vehicle and we will show you the wheels that will fit without rubbing and be inside the wheel well, unless otherwise noted on a specific item. The backspace and offset info is there as well for your reference.

Wednesday, September 5, 2012 by Alan Paulson

58 Chevy Biscayne. Want to run rear 255.50.17 tire on an 8" rim, and smaller diameter tire (235) on a 17 inch rim for the front. Which rims works best in this scenario
Thursday, January 3, 2013 by Marcus

Question: Vehicle:2011 Hyundai Elantra Touring SE 17" x low profile (stock). Although the set handles well on dry pvmt,the tyres that go w/those do not meet my needs (more varied terrain/ more effect M&S. What is chance for 16" rims and higher profile tyres that accommodate more choices of tyres.
Thanks for your answer in advance.
Friday, January 4, 2013 by Hunter

Hi Marcus,
A 205/55r16 or 215/55r16 will fit that vehicle.
Monday, March 4, 2013 by Tom Pellegrini

so i have a pair of xd monster rims 18x9 with 18mm offset.I need to figure out the back spacing on these rims. any input i would greatly appreciate.
thanks for replies
Tuesday, March 5, 2013 by Hunter

That should have a backspace of around 5.75"
Monday, June 24, 2013 by Toby

i have a 1991 GMC suburban with a 4" lift and i was wanting some 10" wide rims. what kind of offset would i need so i would still have the same steering ans so it wouldn't rub on my leaf springs?
Tuesday, June 25, 2013 by R Fleschner

I have a set of Bridgestone Blizzak WS70 215/55R16, one season old. Will these work on 16" steel wheels for a 2013 Toyota hybrid Camry? These are excellent tires and I would hate to give them up!
Tuesday, June 25, 2013 by Hunter

Hi Toby,
Tire Rack is not able to guarantee wheel and tire fitments on modified vehicles. My nest suggestion is to go back to the manufacturer of your lift kit. They should be able to give guidance on what wheel/tire combo will clear with their kit.
Tuesday, June 25, 2013 by Hunter

Hi R,
The 215/55R16 looks to be too short. I wouldn;t recommend that.
Monday, August 12, 2013 by Luther Harvey

I just got a 2005 Jeep Wrangler unlimited and I am looking to get a set of +1 or +2 rims/wheel configuration. I like when I see jeeps with the wheels flush with the outside fender or stick out a little bit. The current tires are 31 x 10.5 R15. I don't want more tire sitting in the wheel well when I upsize...just the opposite. What should I look for when I shop for wheel/tire package?
Tuesday, September 17, 2013 by Chris

I have a 2001 E430 sport RWD all stock. I was wondering if I could fit a 19x9 wheel all around with a 33 offset. If so, what size tire would you recommend?
Wednesday, September 25, 2013 by JJ

Will the stock wheels from a 2010 MB E550 that are 18x8.5 and 18x9 staggered with 245/45/18 fit my 2006 MB C280 4Matic without any problems? Thanks!
Sunday, December 8, 2013 by Susan Pense

I have a 2011 Ram 1500 4x2 - I was given a set of 20x10 rims with a -25 offset and 4.62 backside and 5x5.50 bolt pattern for my birthday. I want to use 275/65/20 BFG and add a 2" leveling kit on the front - will this work without cutting my bumper/fenders?
Tuesday, March 18, 2014 by David Mazurek

Want new wheels to fit 2004 Dodge Ram 1500 Quad Cab (5.7 gas)with my 305/70/17 tires. I understand stock offset is +25.4mm and stock backspacing is 5.50 inches. How wide of a wheel should I go? (No lift kit.) What offset, backspace should I have with that width?

PS Why doesn't an 8" wide rim with a 4" back space have a 0mm offset? Wouldn't the 4" backspace put the mounting surface exactly in the middle of the wheel, therefore 0mm offset? Hmmmm.

Not wasting your time, purchased multiple times from you. Same name, email was mazurekd@matc.edu
Wednesday, March 19, 2014 by hunter

Hi David,
Best way to know what will fit is to shop by vehicle on our website. The backspace and wheel width measurements are done from different points.
Sunday, April 27, 2014 by Larry Hinton

Want new wheels and tires to fit 2013 Chevy 2500HD.Getting 7.5 suspension lift and want 35x12.5x20 tires. I am confused by backspacing and offset for new rims. I want BMF wheels but they are offered in 0mm offset. Does this make the rim and tire stick out from the fender?
Tuesday, April 29, 2014 by hunter

Hi Larry,
With a 7" lift anything we list for the truck when you shop by vehicle will fit.
Sunday, July 27, 2014 by Rocky

I have a 67 Corvette small block...Wanting to put a beefy wheel and tire on the rear...Would like for it to fit nicely in the fender well..I was thinking of a 17 inch wheel ..with 7 or 8 inch wide...I recently tried a 17x7 with 4 inch backspace...I wanted more tire tucked in there..I can move brake cable bracket with no problem . This is a car that will see no more than 250 to 500 miles a year at local cruise ins.....Any advice on what would work best? I have looked on Corvette forums and learned a little but help from tire and wheel experts would be appreciated. Thank you
Monday, July 28, 2014 by hunter

Hi Rocky,
Tire Rack's fitment guide is much more conservative than what you want to do. We do not go over 16" tires on that car.
Thursday, July 31, 2014 by Greg Hamilton

I finally found a set of aftermarket wheels I would love to put on my 2010 Ford FX4. I'm hoping the wheel size and offset will work with my truck without the rims sticking out proud of the fenders. The size is 20x9 6/114.3,6/139.7 +18mm offset. I'd like your opinion before I hit the "add to cart" button. THANKS!
Thursday, August 14, 2014 by randy

Hi I want to get 15x8 wheels for my 1999 ford escort zx2 hot coupe. And I was wondering what offset and backspacing I would need to fit correctly on my car.
Friday, August 15, 2014 by hunter

Hi Randy,
i am sorry bit we do not list any 15 x 8 to fit your car.
Sunday, August 17, 2014 by Mike

I have a Prius Hatch (not V or C) and want to stay with 15" wheels and keep the wheels under the fenders as close to stock as possible.
Prius comes with 15x6, +45mm wheels. What would 15X6.5 with +38mm offset do to the tires? My guess would be .28" for the offset and about .25" for the additionalrim width, so the tire will stick out about .58" more than stock?
Monday, August 18, 2014 by hunter

Hi Mike,
I am getting 13mm (1/2") further out with the 6.5 +38
Monday, November 3, 2014 by johnny

hey guys, need some backspacing info if possible. i have a 70 c10 with 13' rotors upfront and 12' rotors in rear. i wanna run a 22' wheel, but have no previous wheel this big to go off to measure with.....
Monday, November 3, 2014 by hunter

Hi Johnny,
I am sorry but we do not have 22" fitments set up for the truck. It may a case of doing some test fitting.
Monday, November 17, 2014 by Tom Haney

I have a 2007 GMC Sierra 2500 HD 4x4 and would like to get new tires and wheels, but I am confused as to offset and tire size. It has 16"wheels now. I would not mind going to a 17" but no larger. I also do not want to jepordize towing safety as I pull a 12,000 5th wheel camper. Also do not want the tires and wheels to stick out much farther than the the factory wheels. don't want the total height to be more than 33" as I am only doing 2" level kit in front and no lift on the rear. Suggestions!
Tuesday, May 5, 2015 by Greg

I have a 1971 Chevelle. looking at a 15by7wheel with 3-3/4" rear spacing with a 255/60-15 tire will I have any clearance issues
Wednesday, May 6, 2015 by hunter

Hi Greg,
I am happy to try and confirm the fitment for you . Which wheel on our website are you looking at?

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