1. What can I do to up the awesome on my crappy car?

3. Awwww yessss. Look at the beautiful speedometer and odometer.

4. Wait a minute, What did I just change
Wait a minute, What did I just change? Let’s learn a little about these tires and the correlation to the speedometer.

7. P215/65R15
215 specifies the tire’s width in millimeters

8. P215/65R15
65 is the aspect ratio. It is the ratio of the height to the width. The height, in this case, is 65% of the width.

9. P215/65R15
15 is the diameter of the tire’s rim in inches.

10. Fill in the missing information for each tire size.
P225/75R15
P205/70R14
Width (mm)
Aspect Ratio (%)
Sidewall Height (in.)
Diameter (in)
Circumference (in)

11. Fill in the missing information for each tire size.
P225/75R15
P205/70R14
Width (mm)
225 mm
Aspect Ratio (%)
Sidewall Height (in.)
Diameter (in)
Circumference (in)

12. Fill in the missing information for each tire size.
P225/75R15
P205/70R14
Width (mm)
225 mm
Aspect Ratio (%)
75%
Sidewall Height (in.)
Diameter (in)
Circumference (in)

13. Fill in the missing information for each tire size.
P225/75R15
P205/70R14
Width (mm)
225 mm
Aspect Ratio (%)
75%
Sidewall Height (in.)
225(.75) =
168.75(.04) = 6.75
Diameter (in)
Circumference (in)

14. Fill in the missing information for each tire size.
P225/75R15
P205/70R14
Width (mm)
225 mm
Aspect Ratio (%)
75%
Sidewall Height (in.)
225(.75) =
168.75(.04) = 6.75
Diameter (in)
6.75(2) + 15
28.5 in
Circumference (in)

15. Fill in the missing information for each tire size.
P225/75R15
P205/70R14
Width (mm)
225 mm
Aspect Ratio (%)
75%
Sidewall Height (in.)
225(.75) =
168.75(.04) = 6.75
Diameter (in)
6.75(2) + 15
28.5 in
Circumference (in)
28.5p
89.54 in

16. Fill in the missing information for each tire size.
P225/75R15
P205/70R14
Width (mm)
225 mm
205
Aspect Ratio (%)
75%
Sidewall Height (in.)
225(.75) =
168.75(.04) = 6.75
Diameter (in)
6.75(2) + 15
28.5 in
Circumference (in)
28.5p
89.54 in

17. Fill in the missing information for each tire size.
P225/75R15
P205/70R14
Width (mm)
225 mm
205
Aspect Ratio (%)
75%
70%
Sidewall Height (in.)
225(.75) =
168.75(.04) = 6.75
Diameter (in)
6.75(2) + 15
28.5 in
Circumference (in)
28.5p
89.54 in

18. Fill in the missing information for each tire size.
P225/75R15
P205/70R14
Width (mm)
225 mm
205
Aspect Ratio (%)
75%
70%
Sidewall Height (in.)
225(.75) =
168.75(.04) = 6.75
205(.70) = 143.5
143.5(.04) = 5.74
Diameter (in)
6.75(2) + 15
28.5 in
Circumference (in)
28.5p
89.54 in

19. Fill in the missing information for each tire size.
P225/75R15
P205/70R14
Width (mm)
225 mm
205
Aspect Ratio (%)
75%
70%
Sidewall Height (in.)
225(.75) =
168.75(.04) = 6.75
205(.70) = 143.5
143.5(.04) = 5.74
Diameter (in)
6.75(2) + 15
28.5 in
5.74(2) + 14
25.48 in
Circumference (in)
28.5p
89.54 in

20. Fill in the missing information for each tire size.
P225/75R15
P205/70R14
Width (mm)
225 mm
205
Aspect Ratio (%)
75%
70%
Sidewall Height (in.)
225(.75) =
168.75(.04) = 6.75
205(.70) = 143.5
143.5(.04) = 5.74
Diameter (in)
6.75(2) + 15
28.5 in
5.74(2) + 14
25.48 in
Circumference (in)
28.5p
89.54 in
25.48p
80.05 in

21. Diameter of tire = sidewall height x 2 + wheel diameter
A person decided to alter the appearance of his car by adding a lift kit, new suspension, & larger wheels. The original 1993 Chevrolet Caprice had P225/75R15 tires. The modified version had P305/30R26 tires. If the speedometer wasn’t recalibrated, how fast is the person actualIy going on the new tires when his speedometer shows 60 mph?
Diameter of tire = sidewall height x 2 + wheel diameter
Determine the diameter of the original tires.
Determine the diameter of the new tires.
225(.75) x 2 x = 28.5 in.
Circumference = 28.5p = 89.5 in.
305(.30) x 2 x = 33.3 in.
Circumference = 33.3p = in.

22. After one rotation of the wheel, how many inches further has the car with the larger tires traveled than the car with the factory-installed tires?
104.6 – 89.5 = 15.1 inches
After one rotation of the wheel, the car with the larger tires has
traveled how many times further?
1.2 (Work: /89.5)
If the odometer reading is 89,000, what is the actual mileage with the
larger tires?
106,800 miles (Work: 89,000 x 1.2)

23. Diagonal2 = length2 + width2 Diagonal2 = 452 + 262
Television sizes are usually described by the length of their diagonal measure. What would be the listed size of the TV shown in the picture?
45”
Diagonal2 = length2 + width2
Diagonal2 =
Diagonal2 =
26”
Diagonal2 = 2701
Diagonal = 52 in.

24. Diagonal2 = length2 + width2 552 = (4x)2 + (3x)2 3,025 = 16x2 + 9x2
What would be the length and width of a 55” TV that has an aspect ratio of 4:3?
Diagonal2 = length2 + width2
552 = (4x)2 + (3x)2
55”
3,025 = 16x2 + 9x2
3025 = 25x2
121 = x2
x = 11
Length: 4(11) = 44 in Width: 3(11) = 33 in