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jmccall85 said:
So you reply with are you going to carry it expect that from a 5 year old !!!!!!
Curious because a have a ford f250 3" lift kit 285 75 16 tyres that tows all my stuff around
One yes the speedo is out a little
To which a adjust my speed
So who tests a speedo as it ain't a mot fail oh wait the now theres a jacked up vehicle no what we will pull that over as his speedo is going to be out oh but he's not speeding !!!
Click to expand...

I take it you have never heard of construction and use regulations then.
 
wammers said:
I take it you have never heard of construction and use regulations then.
Click to expand...
Just curious, but could you post a direct link to the reg you are citing? I can find the regs saying you need an mph and kph speedo and should be in good working order, which when running bigger tyres it still is.

I'd like to know the C&U reg for the 10% thing you posted, my Google-fu skills are not up to finding it.

Also, as many speedo's in more modern vehicles over read stock, fitting larger tyres is still likely to have them fall within any tolerance anyhow.
 
300bhp/ton said:
Just curious, but could you post a direct link to the reg you are citing? I can find the regs saying you need an mph and kph speedo and should be in good working order, which when running bigger tyres it still is.

I'd like to know the C&U reg for the 10% thing you posted, my Google-fu skills are not up to finding it.

Also, as many speedo's in more modern vehicles over read stock, fitting larger tyres is still likely to have them fall within any tolerance anyhow.
Click to expand...

Look up ECE-R-39

It's an EU regulation which is probably why Wammers is so hot on compliance being a big fan anorl ;):p
 
300bhp/ton said:
Just curious, but could you post a direct link to the reg you are citing? I can find the regs saying you need an mph and kph speedo and should be in good working order, which when running bigger tyres it still is.

I'd like to know the C&U reg for the 10% thing you posted, my Google-fu skills are not up to finding it.

Also, as many speedo's in more modern vehicles over read stock, fitting larger tyres is still likely to have them fall within any tolerance anyhow.
Click to expand...

Did you miss the bit about 2001 onwards? Old speedo regs were + or - 10% at an indicated 30 MPH. That is because when they were introduced the only speed limit there was in the country was 30 MPH in built up areas. Everywhere else was unrestricted. That is why speed cameras are set at 30 MPH +10% +2 MPH before they activate. In 1999 the EU introduced a law that said speedos could not read any slower than actual road speed. But actual road speed could be 10% less than indicated to allow for tyre wear. That was introduced in the UK in 2001. Larger diameter tyres than standard would make any vehicle made in or after 2001 instantly illegal for use on the road. Older vehicles still enjoy the + or - 10 % rule so have a tad more tolerance to tyre size. So technically if some dickhead with a speed gun records your series III at 31 MPH in a 30 area and tries to ticket you he cannot do it. However if your car was made after 2001 he can.
 
The speedo percentage can be adjusted with a Nanocom to allow for larger tyres on the P38. But i still recon those tyres will stress the clutch on a manual.
 
£50 digital speedo with a reed switch stick a magnet on a hub/wheel/prop shaft etc set it up and this argument is complete bollocks
Or if you really must one for a fiver off a bicycle will do!
 
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It's prolly more to do wiv taking away a defence of "but my speedo said.. " and also allows police forces a zero tolerance speeding policy if they want it.

Other than that it's not an issue
 
Just fit one of these and be done with it

spee.jpg
 
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