On my EF i got 234/45 17's and im pretty sure my spedo is outta wack ever since i put em on... also for some reason i can get the digital spedo up on the odo reading thingy and that shows me a different speed to the spedo too...
any way of correcting my spedo
Wouldn't the EF have come with 205/65R15? Is this an Fairmont or Ghia and EF1 or EFII?
If so your speedo will be correct if you swap to 235/45R17 as they have the same rolling radius. If it did come with 215/60R16 then the speedo would read 3% fast ie 100kmh would only be 97kmh. Not really a problem. but you could change speedo drive gears to fix it.
Let me know what the car came out of the factory with and I can work out the difference to waht you have now.
From new Ford sold them with 15' wheels and 205/65R15 tyres.
There was a very popular 16" wheel option ( XR6 ) which came with 225/50R16 tyres.
Either way changing to 235/45R17 tyres does change the speedo reading by 4/5 of F*** ALL.
By good design or strange coincidence there is less than 1/2 a percent difference in rolling radius between 205/65R15, 225/50R16 and 235/45R17 tyres so your speedo isn't affected by the different wheels and tyres much at all.
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