Radial tires and bias-ply tires

You'll need to check recommended tire size for your vehicle, normally on a tag along the driver's side door frame. The G78-14 tire is approximately equivalent to a P215/75R14 tire. Please make sure you put the same size tire on both sides of your car, front or rear, to avoid stability problems and excess differential wear, and NEVER mix radial ply tires with bias ply tires.

There has been a lot of discussion for that over the last 3o or 40 years. Old type "bias" tires were recommended to criss-cross. I personally don't like to change the direction of rotation for radial tires, they wear very quickly for several months if you do that, so I keep them on the same side.

Been a while since I messed with tires and nomenclature, but as I recall, the "R" just indicated that it was a radial tire. Not really necessary anymore, as bias ply tires are virtually non-existant in passenger car tire sizes. I wouldn't worry about the absence of the R on the new tires. I assume you're looking at tires at a tire shop or tire retailer of some sort... they should know what the deal is.

Hi Anthony, It would help to know what vehicle it is? You should have the vehicle alignment inspected and adjusted. If your alignment center is good and know what they are doing, they should be able to tell you if the vehicle has worn tie rod ends or ball joints. They should also be able to advise if the suspension bushes are worn and in the case of your vehicle having king pins, be in a position to advise of excessive wear and any need to replace. If radial ply and cross ply tyres are mixed, especially on an axle, the vehicle will wander very badly and become very dangerous. Radial and cross ply tyres must not be mixed. Regards John

You should have a pressure chart under your seat to tell you. Normally, about 3 to 5 psi extra on rear bias ply tires. 0 to 3 psi on both radial tires.

problems like this are best discussed with an accredited bike shop who has experience with wheel wobbles
you have changed the front tire to radial but did you change the back tire at the same time as radials and cross ply ( bias ply) tires have different handling characteristics
the wobble may be like a lack of compatibility between case constructions and I am thinking this because you say that the problem goes when changing back to the bias ply

The driving tires ... front or rear wheel drive? 4 wheel drive? put on the rear.

Owners manual. Roatation for radial tires is front to back
Old style bias ply tires u used to cross switch during rotation (x pattern)
Newr carsa is front left to rear left and right rear to front right.

NEVER swap rear tires... the radial tires are not made/designed to be driven one way and then driven the other... they WILL delaminate and come apart.. when you rotate tires, you rotate front and rear on the same side....(old bias-ply tires were rotated around a vehicle)
... if you did not have both sides of the rear brakes fitted with new pads and ..at least had the rotors turned.. do that. look closely at the inside of your wheels and make sure there has been no contact.... once you have made sure both sides are good.. reply back to me on here.. thanks... please mark as helpful.. thanks

The main difference between radials and bias-ply tires lies in their construction. Tires aren’t just toroidal balloons, they are reinforced with cords of steel or synthetic materials such as nylon or Aramid. In bias-ply tires, the fibers are wrapped in an X pattern between the beads; in radial tires, the fibers are wrapped perpendicular to the tread. Radial tires have more flexible sidewalls than bias-ply tires, and thus absorb road irregularities better and have a comparatively larger contact patch when leaned over. Because of the flexible nature of a radial, these offer higher mileage compared with a comparable bias-ply for a given rubber compound. Since they absorb small road irregularities better, they ride more comfortably and are less likely to be upset by groovy pavement. While radial tires perform better than bias tires, some older motorcycles can’t be fitted with radial tires because of differences in rim profiles. You probably won’t notice much of a difference anyway, so stick with boas tires if that’s what the motorcycle was designed for.