no it will not.
Bigger rims (wheels) will make the car faster in a straight line but more difficult to turn. Smaller ones will have the opposite effect. The speed difference is about +- 2% of whatever the speedometer is reading.
Yes, if you have the correct width and back spacing. You will need a tire with a lower profile (sidewall height tire) to maintain tire diameter/height, or your speedometer will be inaccurate.
Assuming a tyre profile of something like 205/45/17 i'd suggest 32psi is what you should use. The lower the profile, the higher the psi otherwise you risk buckling the rim on a pothole. Other factors to consider include the original rim size, and the weight distribution of your car. Big powerful cars, or diesels usually require slightly higher pressures on the front wheels, ie 33 or 34psi Buzz @ FiatBOO
235/75/15 wold be the standard tire sizefor a 79 Lincoln Town Coupe', Town Car, and Mark V. Tire size broken down? 235 is the width of the tread measured in millimeters. 75 is the percentage of the width (in this case 75% of 235 mm) is the tire profile. OR, the sidewall of the the tire from the road to the edge of the wheel rim. A tire that has a size of 235/40/15 would have a far lower profile, or road to rim measurement, and would be considered and higher performance tire. Lastly, the 15 on the tire you had the size question on indicates the wheel rim diameter in inches....
Not necessarily. It all depends on the compound used in the tire.
No the grooves are the tread, the profile is the height of the tire from the rim measured in percentage of tire width.
profile is not as important as tire type. A high mileage tire is usually a harder compound and will break loose easier..
Yes, this is considered a low profile tire.
it is 40psi
More than likely tire issues. As simple as tire balance if not possibly a tire going south on you. Tell me more. Does it do it just at 40 or at higher or lower speeds as well, and where do you feel it, steering wheel, seat....and can you do anything to make it more pronounced?
44 psi
Of course.
The aspect ratio is the tires profile. For instance, a tire with a 60 aspect ratio means that the tires hight from tread to rim is 60% of the tires nominal width. The lower the aspect ratio # the wider the tire.