Tire Data Calculator

(updated Dec 2018) If this calculator doesn't work in this site or if you need a mobile friendly site, try The NEW BND TechSource website. Sorry for any inconvenience. Explanations for the Input and Output values can be found on the Tire Data Information page. To calculate the tire-geometric data: Input the following Tire specific data: - Tire Section Width - Tire Aspect Ratio - Rim Diameter - Rim Width Select: - Tire Load Index Number - Tire Speed Index Letter Input the following Vehicle specific data: - Tire Air Pressure - Vehicle Speed - Vehicle Corner Loads

Static Input Data	Value Tire 1	Value Tire 2
Tire Section Width in mm (e.g. 245 mm as in 245/45 R 17 95W)
Aspect Ratio in % (e.g. 45% as in 245/45 R 17 95W) **
Rim Diameter in inches (e.g. 17" as in 8Jx17)
Tire Load Index Number (e.g. ‘95’ as in 245/45 R 17 95 ZR)	select 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115	select 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115
Tire Speed Rating Letter (e.g. ‘ZR’ as in 245/45 R 17 95 ZR)	select B C D E F G J K L M N P Q R S T H V W Y ZR	select B C D E F G J K L M N P Q R S T H V W Y ZR
Chosen Rim width in inches (e.g. 8" as in 8Jx17)

Static Output Data	Result Tire 1	Result Tire 2
Spec. Design Rim width (mfr’s measuring rim)
Spec. Tire Outer Diameter (at spec. air pres. and no load)
Spec. Tire Section Width (at spec. air pres. and no load)
Spec. Tire Section Height (at spec. air pres. and no load)
Spec. Static Load Radius (@ spec. max load and spec. air pres.)
Spec. Tire Rolling Circ. (@ 60 km/h, spec. load and spec. air pres.)
Spec. Dynamic Rolling Radius (@ 60 km/h, spec. load and spec. air pres.)
Spec. Tire Stiffness Rate (@ spec. load and air pres.)
Tire Air Volume (@ spec. load and air pres.)

Dynamic Input Data	Value Tire 1	Value Tire 2
Veh. Corner Wt. in kg (Input weights right/left or front/rear)
Air Pressure in bar (kPa/100) (See chart on Tire Data Info page)
Vehicle Speed in km/h

Dynamic Output Data	Result Tire 1	Result Tire 2
Vehicle Tire Lower Section Width (@ vehicle load, speed and air pres.)
Vehicle Tire Lower Section Height (@ vehicle load, speed and air pres.)
Vehicle Tire Deflect. (@ vehicle load, speed and air pres.)
Vehicle Tire Rolling Circ. (@ vehicle load, speed and air pres.)
Vehicle Dynamic Rolling Radius or Vehicle Static Loaded Radius if speed = 0 (@ vehicle load, speed and air pres.)
Vehicle Tire Stiffness Rate (@ speed and air pres.)
Contact Patch Width (@ vehicle load, speed and air pres.)
Contact Patch Length (@ vehicle load, speed and air pres.)
Contact Patch Area (@ vehicle load, speed and air pres.)
Speedo Reading (Tire 1 is assumed accurate)
Tire Susp. Comfort Value