The size of tires can effect that accuracy of a speedometer. Larger tires will cause the speedometer to read less than you are actually going.
it can
First, make sure the vehicle has the right size tires. Look on the door plate or in the glove box to find the size recommendations. If the tires are sized correctly, the speedometer cable gear can be changed to affect the speedometer displayed speed. Remove the cable where it enters the transmission tailshaft, count the number of teeth and get a different size gear depending on whether you want the speedometer to display faster or slower. If the speedometer is showing slower than you are actually travelling, get fewer teeth on a replacment gear. If the speedometer is showing faster than you are actually travelling get a gear with MORE teeth on the replacment gear.
If your vehicle has a mechanical speedometer it might be your cable rubbing against its casing
The speedometer in any vehicle does not stop a car from going faster, which many cars can go much faster than the speedometers highest number. Sometimes vehicles are limited from the factory to achieve a speed lower than that on the speedometer like my 2006 silverado says 120 but does only 99. However your truck can go faster than 85 mph.
The speedometer in a car runs based off the speed of the transmission. The gears in the transmission spin at a known rate for the speed the vehicle is traveling at. The faster the gears spin the more the speedometer goes up. If a person replaces stock tires with larger tires, then the tires will spin slower, which will cause the speedometer to read at a value that is less than the actual speed.
It will affect the speedometer. For example, bigger rims will make you go faster than what the speedometer is actually reading. If it say's 50mph with regular rims, then with larger rims you will be going faster.
I own a 1992 Chevy Z24 and went to the end of my speedometer witch read 115 mph and the car still went faster . So you need to find a car with a speedometer that reads more than 120 mph I crashed and rolled over at about 125 mph I rolled about 6 times and landed on the wheels and got out and pissed in the gas tank and kept driving ! Thank GOD for Chevys !
maybe :)
Miles are longer i think as on a speedometer 100miles an hour is faster than 100kmph!x
to help you get around faster than walking but slower than driving
If you change the size of the diameter of the original size of tire , YES If you go LARGER in diameter , you will actually be going FASTER then your speedometer indicates and If you go SMALLER in diameter , you will actually be going SLOWER than your speedometer indicates
speedo cable?