Yet another tyre thread but not what you'd expect

[Mick_Marsh]

Your speedo can be affected by your tyres, so tread carefully - ABC News (Australian Broadcasting Corporation)

The Perentie is quite a bit out but I think the Territory is spot on.
Maybe I should put 9.00 x 16 tyres on the Perentie............

[DAMINK]

I love how tyres vary slightly between brands but we are not allowed to be 1% out when driving. Hell even new cars speedo is not accurate.
Sure fire way to get revenue.

[gromit]

I love how tyres vary slightly between brands but we are not allowed to be 1% out when driving. Hell even new cars speedo is not accurate.
Sure fire way to get revenue.

A new car speedo tends to read a bit high deliberately because the car company don't want a class action when lots of people get prosecuted for speeding when they thought they were within the limit.

My Territories have always read 2-3kmph high on standard tyres.


Colin

[DAMINK]

A new car speedo tends to read a bit high deliberately because the car company don't want a class action when lots of people get prosecuted for speeding when they thought they were within the limit.

My Territories have always read 2-3kmph high on standard tyres.


Colin

What about when the tyres are at the low end of there wear? That must effect there rolling diamater therefor the speedo?
The link above showed that they varied quite a bit. If a car was produced with 101 as the reading at 100 then it would be acceptable yes?
But when your tyres are worn what would the difference be?

Either way i think the variance is way beyond the 1% We are not even allowed these days.
Sucks if you drive a slightly older car (which is registered) but does not read quite as well.

End of the day i like to fight the system and thats about all i got

[Roverlord off road spares]

I get overtaken all the time whilst I sit on the speed limit (n according to my speedo ). My speedo reads 100kph, going under a speed sensor gantry, I get a display from that saying 95 kph. on my GPS if says my speedo is 5kph under. Using my speedo i shouldn't get a speeding fine, but others behind me could get peed off if I'm are traveling under posted speed. It's interesting that the article says not to rely on GPS speed as I reckon a lot of people do.

[Old Farang]

I get overtaken all the time whilst I sit on the speed limit (n according to my speedo ). My speedo reads 100kph, going under a speed sensor gantry, I get a display from that saying 95 kph. on my GPS if says my speedo is 5kph under. Using my speedo i shouldn't get a speeding fine, but others behind me could get peed off if I'm are traveling under posted speed. It's interesting that the article says not to rely on GPS speed as I reckon a lot of people do.

GPS is much more accurate than any type of rotary speed sensor as found on most cars. The only proviso is that the unit needs a good unobstructed signal source. The first unit that I had (Garmin) used an outside antennae, but the current unit does not and tends to lose the signal now and then.

GPS "speedometers" are available as a stand alone unit, and the better ones use exactly the same antennae as my old navigator. I cannot find it now, but I read somewhere that a speeding fine in Australia was defended successfully using evidence from a GPS device. The stand alone speedometers are very useful on a boat, and marine quality units are available.

The following not of much use in Australia, but illustrates several types.

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