Aico
|
| posted on 23/12/07 at 10:32 PM |
|
|
Speedrating
On tyres you have speedratings. What exactly does it mean? If you go over it will it blow up after a long run? Or even blow up very fast if you exceed
it with let's say 30mph?
|
|
|
|
|
smart51
|
| posted on 23/12/07 at 10:59 PM |
|
|
Speed ratings. Is that the maximum speed at the maximum load or the maximum speed at any load? Is there a derating curve for load?
|
|
|
MikeR
|
| posted on 23/12/07 at 11:43 PM |
|
|
i'm too lazy to look it up but the tyre bible (google it) will probably cover it.
I seem to recall its something like 10 mins at that speed without the tyre failing ..... which surprised me as i was expecting a lot more. Luckily i
never intend driving the tin top at its max speed.
(not that the manufacturers are claiming at 10:01 the tyre will explode, just that it won't at 10:00)
|
|
|
iank
|
| posted on 23/12/07 at 11:53 PM |
|
|
One important thing to remember is SVA. If you're tyres aren't rated for the max speed you say the car is capable of you get handed a
fail.
That could be very expensive if you've been over enthusiastic at application time (I've been told design weight and max speed are very
difficult to get changed once they are in the system).
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
|
|
|
David Jenkins
|
| posted on 24/12/07 at 08:11 AM |
|
|
The tester disagreed with the design weight, so he put down on some form or other what he thought they should be, then asked me to sign it.
No great issue really, unless you're out on your figures.
|
|
|
smart51
|
| posted on 24/12/07 at 08:59 AM |
|
|
"All tyres are rated with a speed letter. This indicates the maximum speed that the tyre can sustain for a ten minute endurance without coming
to pieces" Tyre Bible.
10 minutes? Shocking.
|
|
|
David Jenkins
|
| posted on 24/12/07 at 09:07 AM |
|
|
Reminds me of the comment made on Top Gear, when test-driving the Veyron at full speed:
"At this speed the tyres will only last 30 minutes - but it doesn't matter, as a full tank of petrol only lasts 15 minutes!" 
|
|
|
Hellfire
|
| posted on 24/12/07 at 09:29 AM |
|
|
TYRE SPEED RATINGS TABLE
Steve
|
|
|
Mr Whippy
|
| posted on 24/12/07 at 09:53 AM |
|
|
design weight? how do you get that???
is it the car with the fattest person that will fit and a full load of shopping?
Fame is when your old car is plastered all over the internet
|
|
|
iank
|
| posted on 24/12/07 at 10:12 AM |
|
|
quote:
Originally posted by Mr Whippy
design weight? how do you get that???
is it the car with the fattest person that will fit and a full load of shopping?
Pretty much from my understanding. Say car weight + 250kg (two big blokes + 50kg for luggage)
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
|
|
|
David Jenkins
|
| posted on 24/12/07 at 10:16 AM |
|
|
There is a proper formula in the SVA manual - they allow 75Kg per person, which is quite skinny! There's a luggage allowance per person,
etc.
My 600Kg car ended up with a design weight of 800Kg on the official records.
David
[Edited on 24/12/07 by David Jenkins]
|
|
|
