Oversized tyres and trip computer inaccuracies

[Steve Bullman]

If i put oversized tyres on my 4x4 im told its going to throw the speedometer out slightly.....but does this affect the mpg reading on the trip computer or is this calculated another way?

[Stephen Blair]

If i put oversized tyres on my 4x4 im told its going to throw the speedometer out slightly.....but does this affect the mpg reading on the trip computer or is this calculated another way?

 

you cant pimp your ride mate, then worry about little things like that. you are getting old steve:001_tongue:

[Steve Bullman]

more curious than anything mate!

[hplp]

It probabily will as I think that on most modern cars its calculated via sensors in either the wheels or as in a land rover from the back of the transfer box.

 

H

[josharb87]

when i went from standard wheels on my landrover (205R16) to slightly oversized (31x10.5) i wondered this too, borrowed a gps, and the speedo was dead accurate to the gps reading-guessing the original speedo under-read!

[garth mc garth]

yeh it does change it steve, mine is out about 15mph after i changed tyres

[Steve Bullman]

mpg im interested in. whats the 15mph reading from?

[garth mc garth]

mpg im interested in. whats the 15mph reading from?

 

the 15mph is by how far the speedo at the needle is away from the true road speed

[Steve Bullman]

call me dense...it cant be 15mph out throughout the whole range. what speed are you going where you estimate its 15mph out?

[Dean Lofthouse]

Mines 8mph out at 70

 

The toyota that is, the landy is spot on