The chart below is for conversion of one type of size series with original inch sizes from the 60's and 70's. This is for as close to a direct replacement for each size but is not endorsed by any safety group or manufacturer of tires or automobiles. You should always use the proper size tire but when an older car size is no longer produced, this might help. Please consult your tire dealer before you make any decisions if you are in doubt as to if you should use a certain size tire.

TIRE SIZE COMPARISON

"Letter" Size

Inch Size

Metric-inch Size

"60 Series"

"70 Series"

"78 Series"

1965-77

"60 Series"

"70 Series"

"80 Series"

 

 

 

5.50-12, 5.60-12

165/60-12

165/70-12

155/80-12

 

 

Y78-12

6.00-12

 

 

 

 

 

W78-13

5.20-13

165/60-13

145/70-13

135/80-13

 

 

Y78-13

5.60-13

175/60-13

155/70-13

145/80-13

 

 

 

6.15-13

185/60-13

165/60-13

155/80-13

A60-13

A70-13

A78-13

6.40-13

195/60-13

175/70-13

165/80-13

B60-13

B70-13

B78-13

6.70-13

205/60-13

185/70-13

175/80-13

 

 

 

6.90-13

 

 

 

C60-13

C70-13

C78-13

7.00-13

215/60-13

195/70-13

185/80-13

D60-13

D70-13

D78-13

7.25-13

 

 

 

E60-13

E70-13

E78-13

7.75.13

 

 

195/80-13

 

 

 

5.20-14

165/60-14

145/70-14

135/80-14

 

 

 

5.60-14

175/60-14

155/70-14

145/80-14

 

 

 

5.90-14

 

 

 

A60-14

A70-14

A78-14

6.15-14

185/60-14

165/70-14

155/80-14

 

B70-14

B78-14

6.45-14

195/60-14

175/70-14

165/80-14

 

C70-14

C78-14

6.95-14

205/60-14

185/70-14

175/80-14

D60-14

D70-14

D78-14

 

 

 

 

E60-14

E70-14

E78-14

7.35-14

215/60-13

195/70-14

185/80-14

F60-14

F70-14

F78-14, F83-14

7.75-14

225/60-14

200/70-14

195/80-14

G60-14

G70-14

G77-14, G78-14

8.25-14

235/60-14

205/70-14

205/80-14

H60-14

H70-14

H78-14

8.55-14

245/60-14

215/70-14

215/80-14

J60-14

J70-14

J78-14

8.85-14

255/60-14

225/70-14

225/80-14

L60-14

L70-14

 

9.15-14

265/60-14

235/70-14

 

 

A70-15

A78-15

5.60-15

185/60-15

165/70-15

155/80-15

B60-15

B70-15

B78-15

6.35-15

195/60-15

175/70-15

165/80-15

C60-15

C70-15

C78-15

6.85-15

205/60-15

185/70-15

175/80-15

 

D70-15

D78-15

 

 

 

 

E60-15

E70-15

E78-15

7.35-15

215/60-15

195/70-15

185/80-15

F60-15

F70-15

F78-15

7.75-15

225/60-15

205/70-15

195/80-15

G60-15

G70-15

G78-15

8.15-15, 8.25-15

235/60-15

215/70-15

205/80-15

H60-15

H70-15

H78-15

8.45-15, 8.55-15

245/60-15

225/70-15

215/80-15

J60-15

J70-15

J78-15

8.85-15, 8.90-15

255/60-15

235/70-15

225/80-15

 

K70-15

 

9.00-15

265/60-15

245/70-15

230/80-15

L60-15

L70-15

L78-15, L84-15

9.15-15

 

 

235/80-15

 

M70-15

M78-15

 

 

 

255/80-15

 

 

N78-15

 

 

 

 

 

 

 

 

 

 

 

Here is another chart that may be easier to read - they are not exactly the same so use this as a starting point.


Note: Every size tire is not listed and many size comparisons are approximate, based on load ratings. Wider tires than those supplied new with the vehicle, should always be checked for clearance.

Tire Size Charts

75-series 14" Radial Tires

Description

Tread width

Overall diameter

Rev / mile

Rim Width

 

185-75R14

4.8

24.9

809

 

195-75R14

5.1

25.5

790

 

205-75R14

5.3

26.1

773

 

215-75R14

5.6

26.7

755

 

225-75R14

5.9

27.3

739

 

235-75R14

6.1

27.9

723

 

70-series 14" Radial Tires

Description

Tread width

Overall diameter

Rev / mile

Rim Width

 

165-70R14

4.6

23.1

873

 

175-70R14

4.9

23.6

853

 

185-70R14

5.2

24.2

834

 

195-70R14

5.5

24.7

815

 

205-70R14

5.8

25.3

797

 

215-70R14

6.0

25.9

780

 

225-70R14

6.3

26.4

764

 

235-70R14

6.6

27.0

748

 

60-series 14" Radial Tires

Description

Tread width

Overall diameter

Rev / mile

Rim Width

 

165-60R14

5.2

21.8

925

 

175-60R14

5.5

22.3

906

 

185-60R14

5.8

22.7

887

 

195-60R14

6.1

23.2

869

 

205-60R14

6.5

23.7

852

 

215-60R14

6.8

24.2

835

 

225-60R14

7.1

24.6

819

 

235-60R14

7.4

25.1

803

 

75-series 15" Radial Tires

Description

Tread width

Overall diameter

Rev / mile

Rim Width

 

135-75R15

3.5

23.0

878

 

145-75R15

3.8

23.6

856

 

155-75R15

4.0

24.2

835

 

165-75R15

4.3

24.7

815

 

185-75R15

4.8

25.9

778

 

195-75R15

5.1

26.5

761

 

205-75R15

5.3

27.1

744

 

215-75R15

5.6

27.7

728

 

225-75R15

5.9

28.3

713

 

235-75R15

6.1

28.9

698

 

70-series 15" Radial Tires

Description

Tread width

Overall diameter

Rev / mile

Rim Width

 

185-70R15

5.2

25.2

800

 

195-70R15

5.5

25.7

783

 

205-70R15

5.8

26.3

767

 

215-70R15

6.0

26.9

751

 

225-70R15

6.3

27.4

736

 

235-70R15

6.6

28.0

722

 

255-70R15

7.2

29.1

694

 

60-series 15" Radial Tires

Description

Tread width

Overall diameter

Rev / mile

Rim Width

 

185-60R15

5.8

23.7

850

 

195-60R15

6.1

24.2

833

 

205-60R15

6.5

24.7

817

 

215-60R15

6.8

25.2

802

 

225-60R15

7.1

25.6

787

 

235-60R15

7.4

26.1

773

 

245-60R15

7.7

26.6

759

 

255-60R15

8.0

27.0

746

 

275-60R15

8.7

28.0

720

 

50-series 15" Radial Tires

Description

Tread width

Overall diameter

Rev / mile

Rim Width

 

205-50R15

7.0

23.1

874

 

225-50R15

7.7

23.9

845

 

78-series 14" Bias Ply Tires

Description

Overall diameter

Rev / mile

Design Rim Width

 

A78-14

24.2

835

4.5

B78-14

24.7

817

4.5

C78-14

25.2

799

5.0

D78-14

25.5

791

5.0

E78-14

26.0

776

5.5

F78-14

26.5

761

5.5

G78-14

27.1

745

6.0

H78-14

27.8

727

6.0

J78-14

28.2

715

6.0

70-series 14" Bias Ply Tires

Description

Overall diameter

Rev / mile

Design Rim Width

 

E70-14

25.8

783

5.5

F70-14

26.2

769

5.5

G70-14

26.8

752

6.0

H70-14

27.5

733

6.0

60-series 14" Bias Ply Tires

Description

Overall diameter

Rev / mile

Design Rim Width

 

E60-14

24.8

814

6.5

F60-14

25.3

798

7.0

G60-14

25.8

782

7.0

H60-14

26.4

764

7.0

78-series 15" Bias Ply Tires

Description

Overall diameter

Rev / mile

Design Rim Width

 

A78-15

24.8

813

4.5

B78-15

25.4

795

4.5

C78-15

25.8

781

5.0

D78-15

26.2

769

5.0

E78-15

26.6

757

5.0

F78-15

27.2

741

5.5

G78-15

27.7

729

5.5

H78-15

28.4

711

6.0

J78-15

28.7

702

6.0

L78-15

29.3

688

6.0

70-series 15" Bias Ply Tires

Description

Overall diameter

Rev / mile

Design Rim Width

 

E70-15

26.4

764

6.0

F70-15

26.9

749

6.0

G70-15

27.5

734

6.0

H70-15

28.1

718

6.0

J70-15

28.4

709

6.5

L70-15

28.9

697

6.5

60-series 15" Bias Ply Tires

Description

Overall diameter

Rev / mile

Design Rim Width

 

E60-15

25.5

791

6.0

F60-15

25.9

777

6.5

G60-15

26.4

763

7.0

H60-15

27.1

745

7.0

J60-15

27.4

736

7.0

L60-15

27.9

724

7.0

Vintage Tire Size Conversion Chart

     Use the following chart to figure out the closest modern tire size to your car's original tires. Keep in mind these are close approximations and may not be exact replacements. Before purchasing any tires you should compare outside diameters and the tread footprint to get a better idea on how close a match they are. Your local tire dealer should have this information. Variations in tire diameter will have an effect on speedometer accuracy while the tread footprint will have an aesthetic affect on the appearance of the car. The best way to ensure a 100% correct look for your antique car is to buy reproduction vintage tires in the originally recommended size.
 

Pre-1964

1965-72

80 series metric

Alpha Numeric 78 series

P-Metric 75 series Radial

P-Metric 70 series Radial

5.90-13

600-13

165-13

A78-13

P165/75R13

P175/70R13

6.40-13

650-13

175-13

B78-13

P175/75R13

P185/70R13

7.25-13

700-13

185-13

D78-13

P185/75R13

P205/70R13

5.90-14

645-14

155-14

B78-14

P175/75R14

P185/70R14

6.50-14

695-14

175-14

C78-14

P185/75R14

P195/70R14

7.00-14

735-14

185-14

E78-14

P195/75R14

P205/70R14

7.50-14

775-14

195-14

F78-14

P205/75R14

P215/70R14

8.00-14

825-14

205-14

G78-14

P215/75R14

P225/70R14

8.50-14

855-14

215-14

H78-14

P225/75R14

P235/70R14

5.90-15

600-15

165-15

A78-15

P165/75R15

P175/70R15

6.50-15

685-15

175-15

C78-15

P175/75R15

P185/70R15

6.40-15

735-15

185-15

E78-15

P195/75R15

P205/70R15

6.70-15

775-15

195-15

F78-15

P205/75R15

P215/70R15

7.10-15

825-15

205-15

G78-15

P215/75R15

P225/70R15

7.60-15

855-15

215-15

H78-15

P225/75R15