In a message dated 97-09-22 00:00:04 EDT, robert@woozy.com writes:
<< While perusing my dog eared copy of Robert Bentley's "The Complete
Official
Sprite / Midget 1967-1974" I noticed that the specified tire size for
radials on these cars are 145SR-13. The PO had mounted 155SR-13. I know
that this throws the speedo off, but in which direction? Am I going faster
than the speedo says or slower? Im guessing slower, but math was never my
strongest area.
Are there other advantages/disadvantages to running larger tires? Better
gas milage? Worse gas milage? Smoother ride? etc. I haven't seen 145SR-13
anywhere in my travels through the tire places. Does anyone know if this
size tire is still available? I just checked British Wire Wheel and they
don't even carry them, the 155's are the smallest they stock.
Any help, guidance, answers, donations will be greatly appreciated and
karmically rewarded.
>>
You are probably going faster than the speedo reads; but this assumes that
the 155 has a greater tire height than the 145. More height equals a greater
circumference, and a greater circumference means that the vehicle travels
further with each revolution of the wheel. Your speedo is only a rev counter
hooked to the trans. Higher revolutions make it read higher speeds.
You might want to check the height difference; the tire dealer should have
the info.
Regards, Ray
|