Cross Ply: a series of plies of cord reinforces a tires at 60 degrees across each other from the direction of travel. 

Redial Ply: are series of plies of cord reinforces a tires at 90 degrees to the direction of travel. This help reduce the rolling friction of the tire and does help to achieves better fuel economy than cross/bias ply tires

Low profile: This term refer to the aspect ratio of the tyre side wall. The ratio is gain by Section Height/Section weidth=Aspect Ratio. Determine the aspect ration of a P255/50/R16 tire. 
Low profile tire thens to be more stiff/hard bumpy then normal comfort tires mainly due to their side walls been reduce to prevent side movement of the car especially when cornering.

Racing Tires: These are tire that is sticky on its surface, specially design for high speed racing like F1 and other circuit racing. It had very good grips on the road surface but not on wet roads.

Off Road tire: These tires are very nosiy when used on normal level road. It causes very loud humming sound mainly due to its design on its tread pattern for more grips on muddy or soil track.

Dynamic Wheel balancing: it refer to the wheel been removed and put on to the balancing machine rotating it at a speed of about 300rpm

High Speed balancing: The wheel is not removed from the vehicle. It is balance by attaching a machine to the tire and spinning it at a very high speed. Suitable for those who used to race their cars.