Tyre load rating info needed
Discussion
Hi all,
having a bit of a prob with my SVA, the tyres do not have a load rating number, however it does say max load 650KG which is not accepted by VOSA for some silly reason, does anyone have any experince with this? they are asking me for a letter from the tyre manufacturer (GENERAL) but so far they arent being to helpful, i can get a letter from an engineer but have no idea what info / layout of such a letter would be, any input appreciated,
Thanks in advance!
>> Edited by mrvet on Tuesday 19th July 18:55
having a bit of a prob with my SVA, the tyres do not have a load rating number, however it does say max load 650KG which is not accepted by VOSA for some silly reason, does anyone have any experince with this? they are asking me for a letter from the tyre manufacturer (GENERAL) but so far they arent being to helpful, i can get a letter from an engineer but have no idea what info / layout of such a letter would be, any input appreciated,
Thanks in advance!
>> Edited by mrvet on Tuesday 19th July 18:55
This might help you -
s = 113 mph
t = 118 mph
h = 130 mph
v = 150 mph
vr = in excess of 130 mph
w = 169 mph
y = 186 mph
zr = in excess of 150 mph
When the speed rating system was originally developed the unlimited V category of over 130 mph was the top speed a tyre could achieve. As manufacturers made more tyres that fitted into this category it was necessary to better regulate performance at standardised speeds to ensure safety. The limited V category of 149 mph was then created and the Z speed rating was added as the top speed rating that a tyre could achieve. W and Y limited speed symbols have been added as higher speed categories.
The Old System. 205/60VR15
205 section width in mm
60 aspect ratio
v speed rating
r radial construction
15 rim diameter in inches
In the latest attempt to standardize tyre designations all ratings except unlimited VR and ZR incorporate the speed symbol and load index.
The New System. 205/60R15 91V
205 section width in mm
60 aspect ratio
R radial construction
15 rim diameter in inches
91 load index
V speed symbol.
The load index can be found on the sidewall of the tyre after the size marking.
Load Index.
The load index is an assigned number ranging from 0 to 279 that corresponds with the load carrying capacity of a tyre. Most passenger car tyre load indexes range from 75 to 105 although some passenger tyres carry more.
In the example just shown the load index of 91 corresponds to a load carrying capacity of 615 kg (1356lbs) at maximum inflation pressure.
>> Edited by shoebag on Tuesday 19th July 15:22
s = 113 mph
t = 118 mph
h = 130 mph
v = 150 mph
vr = in excess of 130 mph
w = 169 mph
y = 186 mph
zr = in excess of 150 mph
When the speed rating system was originally developed the unlimited V category of over 130 mph was the top speed a tyre could achieve. As manufacturers made more tyres that fitted into this category it was necessary to better regulate performance at standardised speeds to ensure safety. The limited V category of 149 mph was then created and the Z speed rating was added as the top speed rating that a tyre could achieve. W and Y limited speed symbols have been added as higher speed categories.
The Old System. 205/60VR15
205 section width in mm
60 aspect ratio
v speed rating
r radial construction
15 rim diameter in inches
In the latest attempt to standardize tyre designations all ratings except unlimited VR and ZR incorporate the speed symbol and load index.
The New System. 205/60R15 91V
205 section width in mm
60 aspect ratio
R radial construction
15 rim diameter in inches
91 load index
V speed symbol.
The load index can be found on the sidewall of the tyre after the size marking.
Load Index.
The load index is an assigned number ranging from 0 to 279 that corresponds with the load carrying capacity of a tyre. Most passenger car tyre load indexes range from 75 to 105 although some passenger tyres carry more.
In the example just shown the load index of 91 corresponds to a load carrying capacity of 615 kg (1356lbs) at maximum inflation pressure.
>> Edited by shoebag on Tuesday 19th July 15:22
I think there are normally 3 ratings in addition to the speed rating: load, tread wear and temperature. Usually with a letter A B or C by them. I thought this had been a standard on American tyres for quite some time, it may be that you have some rather old tyres on the car so it might be worth replacing them so that they don't fall apart on the first motorway run ! How long had the previous owner had the car and did he drive it much ?
Firstly - thanks Shoebag - Pistonheads is now a fuilly educational experience!
Tristram - I think the first of the three letters was actually grip. They are such broad ratings I think most modern tyres score A all the time. As for treadwear, this is a number, typically in the range 0f 150-400 (I think...) higher the number more hardwearing, and kind of translates to how soft and grippy the tyre is (although only a v rough guide). At Hockenheim some guy had fancy Advan road/cut slicks with a treadwear of 60...
Tristram - I think the first of the three letters was actually grip. They are such broad ratings I think most modern tyres score A all the time. As for treadwear, this is a number, typically in the range 0f 150-400 (I think...) higher the number more hardwearing, and kind of translates to how soft and grippy the tyre is (although only a v rough guide). At Hockenheim some guy had fancy Advan road/cut slicks with a treadwear of 60...
Cheers for the info guys, ive checked my tyres and they have all the info on them execept the load index number, i have now managed to get hold of the manufacturer in the states with help from the UK supplier. Now i must wait pateintly for a damn letter to prove the index number before i can drive my vet, hopefully the sun will still be out when i get her on the road
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