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

P235/70R15

8.00-15

885-15

230-15

J78-15

P225/75R15

P235/70R15

8.20-15

900-15

235-15

L78-15

P235/75R15

P255/70R15

Rim/Wheel Widths
Each tire has a specific rim width range on which the tire can be mounted. Failure to follow rim width recommendations may result in poor tire performance or possible wheel and/or tire failure.

Below is a quick reference chart listing each tire size and the acceptable rim widths for that size. (The chart does not show all sizes, but gives a good example) Choosing a wheel near the middle of the range will give a balance between ride quality and handling. A wider wheel will improve handling at the expense of ride quality, while a narrower wheel will improve ride quality at the expense of handling. Consider these compromises when selecting wheels.

Metric Rim Widths

Aspect Ratio

Metric Size Designations

Approved Rim Width Ranges

35 Series

275/35R17

9.0-10.5

335/35R17

11.0-13.0

345/35R15

11.0-13.5

40 Series

285/40R15

11.0-13.5

215/40R15

7.0-8.5

245/40R17

8.0-9.5

255/40R17

8.5-10.0

265/40R17

8.5-10.0

235/40R18

8.0-9.5

45 Series

195/40R15

6.5-7.5

215/45R15

7.0-8.5

255/45R15

8.5-10.0

205/45R16

7.0

225/45R16

7.5-9.0

245/45R16

8.0-9.5

215/45R17

7.0-8.5

235/45R17

8.0-9.5

255/45R17

8.5-10.5

50 Series

175/50R13

5.0-6.0

195/50R14

5.5-7.0

205/50R15

5.5-7.5

215/50R15

6.0-7.5

225/50R15

6.0-8.0

195/50R16

5.5-7.0

205/50R16

5.5-7.5

225/50R16

6.0-8.0

235/50R16

6.5-8.5

215/50R17

6.5-7.5

55 Series

205/55R14

5.5-7.5

185/55R15

6.0-6.5

195/55R15

5.5-7.0

205/55R15

5.5-7.5

205/55R16

5.5-7.5

225/55R16

6.0-8.0

Aspect Ratio

Metric Size Designations

Approved Rim Width Ranges

60 Series

185/60R13

5.0-6.5

205/60R13

5.5-7.5

185/60R14

5.0-6.5

195/60R14

5.5-7.0

205/60R14

195/60R15

5.5-7.0

205/60R15

5.5-7.5

215/60R15

6.0-7.5

225/60R15

6.0-8.0

235/60R15

6.5-8.5

65 Series

185/65R15

5.0-6.5

195/65R15

5.5-7.0

205/65R15

5.5-7.5

215/65R15

6.0-7.5

70 Series

165/70R10

4.5-5.5

175/70R12

5.0-6.0

175/70R13

5.0-6.0

185/70R13

5.0-6.5

185/70R14

5.0-6.5

195/70R14

5.5-7.0

205/70R14

5.5-7.5

185/70R15

5.0-6.5

205/70R15

5.5-7.5

215/70R15

6.0-7.5

82 Series

155R12

4.0-5.0

155R13

4.0-5.5

165/70R13

4.0-5.5

175R14

4.5-6.0

185R14

4.5-6.0

165R15

4.0-5.5

P-Metric Rim Width

Aspect Ratio

Metric
Size
Designations

Approved
Rim Width
Ranges

75 Series

P205/75R15

5.5-7.5

P215/75R15

5.5-7.5

P225/75R15

6.0-8.0

P235/75R15

6.0-8.0

80 Series

P155/80R13

4.5-5.5

P165/80R13

4.5-6.0

P175/80R13

4.5-6.0

P185/80R13

5.0-6.5

Aspect Ratio

Metric
Size
Designations

Approved
Rim Width
Ranges

35 Series

P315/35R17

10.0-12.0

40 Series

P275/40R17

8.5-10.0

50 Series

P215/50R13

5.5-8.5

P235/50R13

6.0-9.0

P245/50R14

6.5-9.0

P225/50R15

6.0-8.0

P295/50R15

7.5-11.0

P225/50R16

6.0-8.0

P245/50R16

6.5-9.5

OLD TIRE DIMENSIONS

All Dimensions Are Approximate - Street Tire Sizes

Size

Diameter

Cross Section

Size

Diameter

Cross Section

5.20-10

19.90

5.55

155HR15

24.80

6.10

5.50-12

21.90

5.50

175/70HR15

24.85

6.90

155HR13

22.80

6.50

180HR15

26.80

6.90

185HR13

25.00

7.10

185/70R15

25.71

7.30

5.20-13

22.80

5.65

400/425-15

23.00

4.70

5.60-13

23.70

5.90

5.00-15

24.40

4.75

5.90-13

24.10

6.60

5.60-15

25.90

4.38

6.00-13

23.70

6.20

5.90-15

25.40

5.90

6.40-13

25.10

6.60

6.40-15

26.90

6.25

6.50-13

24.70

6.70

6.70-15

27.40

7.00

7.00-13

25.70

7.10

7.00-15

29.20

7.35

7.25X13

25.70

7.10

7.10-15

28.00

7.40

6.70/7.25-13

25.70

7.40

7.75-15

27.40

7.70

7.50-13

25.80

7.60

7.60-15

28.70

7.90

D70-14

25.32

7.85

8.00-15

29.08

8.30

E70-14

25.76

8.05

8.15-15

28.66

7.90

F70-14

26.24

8.30

8.20-15

29.60

8.50

G70-14

26.82

8.75

890-15

31.00

9.30

205VR14

26.80

8.10

185X16

27.90

7.10

5.20-14

24.20

5.40

475/500-16

24.13

3.94

5.90-14

25.30

6.10

500/525-16

26.80

5.00

6.95-14

25.90

7.00

5.50-16

26.90

5.25

7.00-14

26.50

7.00

6.00-16

26.36

6.25

7.50-14

27.30

7.40

6.50-16

29.30

6.80

7.75-14

26.70

7.75

7.50-16

31.45

8.20

8.00-14

27.60

8.10

8.25-16

32.45

8.80

8.25-14

25.80

8.05

4.50-17

25.35

4.70

8.50-14

28.10

8.35

5.50-17

28.13

5.25

9.00-14

28.70

8.80

7.00-17

31.12

7.38

F70-15

26.94

8.35

7.50-17

31.75

8.00

F60-15

25.94

9.20

Wheel & tire fitment calculator

On MOTORISTO website (not my site)

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

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

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	P235/70R15
8.00-15	885-15	230-15	J78-15	P225/75R15	P235/70R15
8.20-15	900-15	235-15	L78-15	P235/75R15	P255/70R15

Size	Diameter	Cross Section	Size	Diameter	Cross Section
5.20-10	19.90	5.55	155HR15	24.80	6.10
5.50-12	21.90	5.50	175/70HR15	24.85	6.90
155HR13	22.80	6.50	180HR15	26.80	6.90
185HR13	25.00	7.10	185/70R15	25.71	7.30
5.20-13	22.80	5.65	400/425-15	23.00	4.70
5.60-13	23.70	5.90	5.00-15	24.40	4.75
5.90-13	24.10	6.60	5.60-15	25.90	4.38
6.00-13	23.70	6.20	5.90-15	25.40	5.90
6.40-13	25.10	6.60	6.40-15	26.90	6.25
6.50-13	24.70	6.70	6.70-15	27.40	7.00
7.00-13	25.70	7.10	7.00-15	29.20	7.35
7.25X13	25.70	7.10	7.10-15	28.00	7.40
6.70/7.25-13	25.70	7.40	7.75-15	27.40	7.70
7.50-13	25.80	7.60	7.60-15	28.70	7.90
D70-14	25.32	7.85	8.00-15	29.08	8.30
E70-14	25.76	8.05	8.15-15	28.66	7.90
F70-14	26.24	8.30	8.20-15	29.60	8.50
G70-14	26.82	8.75	890-15	31.00	9.30
205VR14	26.80	8.10	185X16	27.90	7.10
5.20-14	24.20	5.40	475/500-16	24.13	3.94
5.90-14	25.30	6.10	500/525-16	26.80	5.00
6.95-14	25.90	7.00	5.50-16	26.90	5.25
7.00-14	26.50	7.00	6.00-16	26.36	6.25
7.50-14	27.30	7.40	6.50-16	29.30	6.80
7.75-14	26.70	7.75	7.50-16	31.45	8.20
8.00-14	27.60	8.10	8.25-16	32.45	8.80
8.25-14	25.80	8.05	4.50-17	25.35	4.70
8.50-14	28.10	8.35	5.50-17	28.13	5.25
9.00-14	28.70	8.80	7.00-17	31.12	7.38
F70-15	26.94	8.35	7.50-17	31.75	8.00
F60-15	25.94	9.20