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Tire Plus Sizing

What's "Inch Up"?

"Inch Up" is the process of mounting a lower aspect ratio tire & larger diameter wheel on your car. This creates a larger contact patch & a shorter sidewall.

 

Why "Inch Up"?

"Inch Up" to improve your vehicle's performance & appearance.
  • Increased Steering Response
  • Improved Dry Handling
  • Enhanced Cornering Ability
  • Aggressive Good Looks

"Inch Up" may be done in several ways. The most popular are:

"Inch Up" to improve your vehicle's performance & appearance.
  1. Plus Zero
    This method utilizes the same wheel diameter as OE, but incorporates a tire with a larger than OE section width & smaller than OE aspect ratio. For example, replacing an OE 175/70R14 tire (on a 5.5-inch wheel) with a 195/60R14 tire would be a proper Plus Zero fitment. Note that this may require a replacement wheel to maintain proper rim width for the new tire.
  2. Plus One
    This method utilizes a one-inch larger diameter wheel, in conjunction with a tire of a one-step lower aspect ratio. An example of an appropriate Plus One fitment is to replace an OE 175/70R13 tire (23-inch overall diameter) with a 185/60R14 tire (22.9-inch overall diameter). Note that this method always requires a replacement wheel.
  3. Plus Two
    This method utilizes a two-inch larger diameter wheel, in conjunction with a tire of a two-step lower aspect ratio. An example of an appropriate Plus Two fitment is to replace an OE 175/70R13 tire (23-inch overall diameter) with a 195/50R15 tire (22.8-inch overall diameter).

An independent research company recently conducted a test to determine the effect Inch Up has on handling. Included here is an abbreviated summary of the test results.

The vehicle used for this comparison was a 1989 Mazda RX-7 SE. The original equipment tire is a 185/70HR14, & is mounted on a 5.5-inch wide wheel. The test was conducted on a dry asphalt surface. As the results from the lateral acceleration & handling course indicate, each successive plus size led to a noticeable increase in handling performance.

This fitment guide recommends several Inch Up applications for both import & domestic vehicles. If the desired Inch Up application is not listed, the guidelines listed on the next page should be utilized to evaluate its appropriateness.

 

Warning:
When changing to a non-OE tire size, always consult the load/inflation charts to determine proper inflation pressure to maintain OE load-carrying capacity.

 

Avon tires Dunlop tires Goodyear tires Michelin tires Uniroyal tires
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 Passenger Tires  Light Truck / SUV Tires

Extreme Performance Summer

Yokohama ADVAN Neova AD07

Max Performance Summer

Yokohama ADVAN Sport

Yokohama AVS Sport

Yokohama AVS Sport RFT

Ultra High Performance Summer

Yokohama A008

Yokohama A008P

Yokohama A022H0

Yokohama A022H1

Yokohama ADVAN A043

Yokohama ADVAN A046

Yokohama ADVAN A10B

Yokohama ADVAN A10F

Yokohama AVS ES100

Yokohama AVS S1

Yokohama Parada Spec-2

Yokohama S.drive

Ultra High Performance All-Season

Yokohama ADVAN A82A

Yokohama ADVAN S.4.

Yokohama AVID W4S

Yokohama AVS dB S2

High Performance All-Season

Yokohama AVID H4S

Yokohama AVID V4S

Yokohama S32A

High Performance Summer

Yokohama ADVAN A11A

Yokohama ADVAN A460

Yokohama ADVAN A680

Performance All-Season

Yokohama AVID S/T

Yokohama AVID T4

Grand Touring All-Season

Yokohama Y390R

Standard Touring All-Season

Yokohama AVID TRZ

Yokohama AVID Touring

Yokohama Y376B

Yokohama Y376M

Yokohama Y376R

Yokohama Y376RX


Passenger All-Season

Yokohama AVID S33

Yokohama AVID S33B

Yokohama AVID S34B

Yokohama Aegis LS4

Yokohama S330

Yokohama Y372

Yokohama Y379B

Competition

Yokohama ADVAN A048

Yokohama ADVAN A032R
 

Street/Sport Truck Summer

Yokohama ADVAN S.T.

Yokohama AVS S/T

Street/Sport Truck All-Season

Yokohama Geolandar H/T-S G052

Yokohama Parada Spec-X

Highway Rib Summer

Yokohama RY103

Yokohama RY215

Yokohama Y356

Yokohama Y785R

Yokohama Y788R

Highway All-Season

Yokohama Geolandar G91A

Yokohama Geolandar H/T G031

Yokohama Geolandar H/T G033

Yokohama Geolandar H/T G034

Yokohama Geolandar H/T G035

Yokohama Geolandar H/T G039

Yokohama Geolandar H/T G046

Yokohama Geolandar H/T G900

Yokohama Geolandar H/T G92C

Yokohama Geolandar H/T G93B

Yokohama Geolandar H/T Y816

Yokohama Geolandar H/T-S G051

Yokohama Geolandar H/T-S G053

Yokohama TY213A

Yokohama TY303

Yokohama Y815B

Off-Road All-Terrain

Yokohama Geolandar A/T Plus II

Yokohama Geolandar A/T-S

Yokohama Super Digger IV Y811

Yokohama TY088

Off-Road Maximum Traction

Yokohama Geolandar M/T

Yokohama Geolandar M/T Plus

Yokohama TY025

Yokohama Y703B

Yokohama Y742S