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LukeZS96 · 28-08-16, 10:02 PM

Just noticed coming down the motorway that at 120 KM/H the revs sat at about 3.5K RPM. Normally in or around the 4K mark so I got my girlfriend to get the speed readout on the GPS on her phone and it read 110.4 KM/H when the car was reading 120. I did get the front tyres changed and I had to go from tyres with a 40 sidewall to a 45 sidewall, same as what's on the back. Would this throw the speedo out by so much or am I looking at something else? Speedo is normally out by maybe 1 KM/H+/-

28-08-16, 10:02 PM	#1
LukeZS96 Member Join Date: Jul 2014 Location: Carlow Ireland Posts: 390	Speedo calibration Just noticed coming down the motorway that at 120 KM/H the revs sat at about 3.5K RPM. Normally in or around the 4K mark so I got my girlfriend to get the speed readout on the GPS on her phone and it read 110.4 KM/H when the car was reading 120. I did get the front tyres changed and I had to go from tyres with a 40 sidewall to a 45 sidewall, same as what's on the back. Would this throw the speedo out by so much or am I looking at something else? Speedo is normally out by maybe 1 KM/H+/-