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Tyre Sizing Help

Tyre Sizes

Your tyre size can be found on the sidewall of the tyre.
Sizes are made up of many different combinations including various numbers and letters.

For example, 195/65R15 91H:

195 represents the tyre section width in millimetres (the width of the treaded area)
65 represents the aspect ratio (sidewall height). The number is a percentage of the tyre width.
R denotes the tyre's construction type. In this case, Radial.
15 is the diameter of the wheel in inches.
91 is this tyre's load index.
H is the speed rating for this tyre.

Load Index
The load index is a numerical code associated with the maximum load a tyre can carry at the speed indicated by its speed symbol.

You will find your load rating as shown: 195/65R15 91 H

Load Index	Max. Load (kg)	Load Index	Max. Load (kg)	Load Index	Max. Load (kg)	Load Index	Max. Load (kg)	Load Index	Max. Load (kg)	Load Index	Max. Load (kg)
60	250	71	345	82	475	93	650	104	900	115	1,215
61	257	72	355	83	487	94	670	105	925	116	1,250
62	265	73	365	84	500	95	690	106	950	117	1,285
63	272	74	375	85	515	96	710	107	975	118	1,320
64	280	75	387	86	530	97	730	108	1,000	119	1,360
65	290	76	400	87	545	98	750	109	1,030	120	1,400
66	300	77	412	88	560	99	775	110	1,060	121	1,450
67	307	78	425	89	580	100	800	111	1,090	122	1,500
68	315	79	437	90	600	101	825	112	1,120	123	1,550
69	325	80	450	91	615	102	850	113	1,150	124	1,600
70	335	81	462	92	630	103	875	114	1,180	125	1,650

Speed Rating

The speed rating (denoted by a letter) represents the maximum permissible speed for which the tyre is rated.

You will find your speed rating as shown: 195/65/R15 91 H

Rating	Max Speed	Rating	Max Speed
N	87mph	H	130mph
P	93mph	V	149mph
Q	99mph	Z	150+mph
R	106mph	W	168mph
S	112mph	Y	186mph
T	118mph	Above	Call for speciaist applications
U	124mph

You should replace your tyres with those of the same size, load and speed rating as recommended by the vehicles' manufacturer.

Increasing the value of both the load and/or speed rating is acceptable practice but it is not recommended that lower value products be fitted.

The tyre should be able to withstand the forces applied to it at the vehicles maximum rated top speed.
There is currently no legal requirement for speed ratings but it is advised to check with your vehicle insurer of any potential issues that may arise when significantly altering specifications.

If you require any further information in respect of these issues, please do feel free to give us a call - we will be happy to check all the technical requirements of your specific vehicle (where available).

Further Tyre Information

As well as the size, speed and load rating there is further information available to you when selecting the right products for your vehicle online. Certain vehicle manufacturers work very closely with tyre manufacturers to create a particular product which best suits a given vehicle. Mercedes, for example, may select CONTINENTAL tyres as original equipment for a particular model. These tyres would have been developed by CONTINENTAL to deliver the best overrall performance for that specific model. The tyre will then be branded with an 'MO' classification and provided as an aftermarket product for you to buy when the original tyres become worn out or damaged.

It is not absolutely necessary to purchase a tyre classified in this way, and indeed an MO tyre, for example, could also be fitted to other models and makes of vehicle without issue - it is simply that these products may best suit that make of vehicle.......

N-Rated Porsche Tyres

Original Equipment Porsche tyres have to undergo considerable lab tests in order to prove beyond doubt that they would be able to perform underneath a Porsche running at top speed in both dry and wet weather conditions. Following this work, they are produced and handed over to ever-stringent Porsche engineers to test them to the extreme. If all testing is approved and passed, Porsche will officially approve the tyres for OE fitment on each new model. For every revision, the tyre is reclassified with a new 'N' rating. The process begins with N0 and runs through sequentially to N4 as developments are implemented.
Porsche recommend that only tyres of the same make, model and N rating are fitted to thier vehicles. While it is possible to buy exactly the same looking tyre in exactly the same size and speed/load rating - it is not the optimum product and the car should be driven accordingly....

Other Tyre Manufacturer Related Coding

Tyres developed and denoted as Original Equipment by manufacturers carry additional coding for identification:

CODE	MANUFACTURER	CODE	MANUFACTURER
( - ) or -	Peugeot / Volvo	LOTUS	Lotus
( * ) or *	BMW / Fiat	M	Maserati
( 1 ) or 1	Bentley / Maserati	M0 / MO	Mercedes
1Z	Toyota	M3	BMW M3
5Z	Ford	MB	Mercedes
( a ) or a	Audi / Seat / Volvo / VW	MZ	Mitsubishi / Toyota
( A ) or A	Alfa Romeo	N0	Porsche v.1
AU	Audi	N1	Porsche v.2
AZ	Alfa / Fiat / Subaru / Toyota	N2	Porsche v.3
B	BMW	N3	Porsche v.4
BM	BMW	N4	Porsche v.5
BZ	Audi / Honda / Mazda / Mercedes Opel / Skoda / VW	(P) of P	Peugeot / Porsche
C1	Chrysler / Daimler / Dodge	PZ	Ford / Mazda / Mercedes / VW
CZ	Subaru	R	Renault
DC	Chrysler / Daimler	RE	Renault
DZ	Honda / Mazda / Toyota	RU	BMW / Ferrari / Lexus / Mercedes
EZ	Audi / Mazda 6	SMART	Smart
(f) or f	Fiat	SZ	Mazda MPV
(F) of F	Ferrari / Ford	TZ	Mazda 6
FE	Ferrari	UV	VolksWagen
FO	Ford	UZ	BMW 3 Series / Skoda
G1	Mercedes	Volvo	Volvo
GZ	Subaru	VW	VolksWagen
(J) or J	Jaguar	VW Golf 3	VW Golf mk3
JZ	Seat / Subaru	VW Golf 4	VW Golf mk4
L	Lexus	XZ	Nissan
LZ	Lancia	YZ	Hyundai / Kia / Mazda / Mercedes
K1	Ferrari	Z	Mazda / Toyota
KZ	Nissan / Toyota	R01	Audi