So I replace the P215 70R 14s on my Ford Ranger with P195 70R 14s. Now I think my speedometer is off a little. Am I crazy?
P215 70R 14 Speedometer
- Thread starter yeehaw1960
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You've changed the overall diameter, so not only your speedometer but also your odometer will be off.
Your new tires also have a lower load rating, which is a much bigger problem than your speedo/odo inaccuracy.
What size tires did this truck come with from the factory?
Your new tires also have a lower load rating, which is a much bigger problem than your speedo/odo inaccuracy.
What size tires did this truck come with from the factory?
Of course it's off. The speedometer doesn't work by GPS. It measures how fast your trans is turning, it assumes that you have a stock rear end, it assumes that you have stock tires, and then it displays a speed. Just mathematics.
On newer Fords (nothing that was made in the era of 14" wheels), the PCM can be reprogrammed to compensate for different gears and certain tire changes.
On newer Fords (nothing that was made in the era of 14" wheels), the PCM can be reprogrammed to compensate for different gears and certain tire changes.
Not safe since the new tires have a lower load rating than the original size. Much more important than the speedo calibration.
You can still get decent tires in the original, correct size.
Here is a tire size calculator
You can still get decent tires in the original, correct size.
Here is a tire size calculator
you are going 62.23 when your speedo registers 65mph.
http://www.discounttire.com/dtcs/infoTireMath.do
I don't think its unsafe at that small of a change. You have a slightly higher ratio (read as a lower gear) so it may be a slight bit quicker in acceleration.
http://www.discounttire.com/dtcs/infoTireMath.do
I don't think its unsafe at that small of a change. You have a slightly higher ratio (read as a lower gear) so it may be a slight bit quicker in acceleration.
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A 1995 Ranger base took 195/70/14s. What's your door sticker read?
A lot of people put oversize tires on pickups. Plenty of room without rubbing. So then the base tire looks out of place.
Roll with a GPS, or find one of those naggy radar speed limit signs.
A lot of people put oversize tires on pickups. Plenty of room without rubbing. So then the base tire looks out of place.
Roll with a GPS, or find one of those naggy radar speed limit signs.
What's the OE size? What's the exact year of Ranger?
We need more info before we can start the litany of "it's unsafe" claims.
We need more info before we can start the litany of "it's unsafe" claims.
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