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Across 2. most of the contact is in the outer tread rib, or shoulder but don't wear in the middle 3. in this case, center ribs get more contact with the road and wear faster 5. area of tread worn off 7. changing the location of the tire to ensure maximum tire life 8. usually show up as vibrations,steering wheel pull and abnormal noise 10. this means the car needs wheels balanced or shock absorbers or ball joints or both

Down 1. device for filling bearing cage with grease 4. this is cause by erratic scrubbing against road when tire is in need of alignment 6. Includes punctures, cuts, tears. also known as tire impact damage 8. in excess can cause wheel distortion 9. pressure per square inch