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Discussion Starter #1
TIRE SIZE

Example: P225/50/R17 98H

P identifies your tire as a Passenger Tire. The P stands for PMetric. If your tire size starts with LT rather than a P than it identifies the tire as a Light Truck tire.

225 identifies the tire section width, which is the measurement of the tire from sidewall to sidewall in millimeters. This measurement varies depending on the rim to which it is fitted.

(There are 25.4 millimeters per 1 inch.)

50 is the two-figure aspect ratio. This percentage compares the tire's section height with the tire's section width. For example, this aspect ratio of 50 means that the tire's section height is 50% of the tire's section width.

R indicates the construction used within the tires casing. R stands for radial construction. B means belted bias and D stands for diagonal bias construction.

17 The last dimension listed in the size is the diameter of the wheel rim, which is most often measured in inches.

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Discussion Starter #2
LOAD INDEX AND SPEED RATING

Example: P225/50/R17 98H

The load index and speed rating, or service description, are the numbers that follow the tire size.

The load index tells you how much weight the tire can support when properly inflated. Load indices range from 75 - 105 for passenger tires, with each numeric value corresponding to a certain carrying capacity. The carrying capacity for each value can be found on a load index chart. On each U.S. passenger car tire, the load limit is listed in pounds. European tires have the load limit listed in kilograms and sometimes pounds.

H Speed ratings are represented by letters ranging from A to Z. Each letter coincides to the maximum speed a tire can sustain under its recommended load capacity. For instance, S is equivalent to a maximum speed of 112 mph. Even though a tire can perform at this speed, Continental Tire does not advocate exceeding legal speed limits.


RatingMaximum Speed
Q100 MPH
S112 MPH
T118 MPH
U124 MPH
H130 MPH
V149 MPH
W168 MPH
Y186 MPH
ZOver 149 MPH
 

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I’ve always wondered why the metric and imperial systems are mixed in the tire spec. Haven’t we learned from the loss of the Mars orbiter?


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Discussion Starter #6
Honda Pilot 2008 Alloy wheel fitment guide
Honda Pilot 2008 3.5i


– Generation: I Facelift [2006 .. 2008] [USDM]

– Market: USDM

– Power: 244 hp | 182 kW | 247 PS

– Engine: V6, Petrol

– Center Bore: 64.1 mm

– Wheel Fasteners: Lug nuts

– Thread Size: M12 x 1.5

– Trim Production: [2006 .. 2008]


Tire Rim PCD
136385
235/70R16 104S 6.5JJx16 ET45 5x114.3 2.2
235/65R17 103T 7Jx17 ET50 5x114.3 2.2
255/60R17 103T 7.5Jx17 ET47 5x114.3 2.2
235/60R18 102T 7.5Jx18 ET47 5x114.3 2.2
255/55R18 103H 8Jx18 ET45 5x114.3 2.4
255/50R19 101H 8Jx19 ET45 5x114.3 2.4


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Wheel Dimensions
Wheel Diameter


What Is Wheel Diameter And How Is It Measured?


Wheel Width
Wheel Width

What Is Wheel Width And How Is It Measured?

 
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