Wheel Alignment

[digital_rogue]

I recently changed over to winter tires on new 16" rims (stepping down from 17"). The dealer persuaded me to do a wheel alignment, and gave me a print out of the settings before and after. The changes were small. Now I am wondering if the work was necessary. Does anyone know what the recommended settings and tolerances are for 2009 Rogue AWD SL?

[philipa_240sx]

Alignment settings from the service manual:

Front Wheels:

Tire size 215/70R16 225/60R17

Camber - Degree minute (Decimal degree)Minimum: Left side –1° 00′ (–1.00°), Right side –1° 15′ (–1.25°)Nominal: Left side –0° 15′ (–0.25°), Right side –0° 30′ (–0.50°)Maximum: Left side 0° 30′ (0.50°), Right side 0° 15′ (0.25°)Left and right difference: 0° 33′ (0.55°) or less

Caster - Degree minute (Decimal degree)Minimum: 3° 55′ (3.92°) 4° 00′ (4.00°)Nominal: 4° 40′ (4.67°) 4° 45′ (4.75°)Maximum: 5° 25′ (5.41°) 5° 30′ (5.50°)Left and right difference: 0° 36′ (0.60°) or less

Kingpin inclination - Degree minute (Decimal degree)Minimum: 9° 45′ (9.75°)Nominal: 10° 30′ (10.50°)Maximum: 11° 15′ (11.25°)

Total toe-in - DistanceMinimum In: 1 mm (0.04 in)Nominal In: 2 mm (0.08 in)Maximum In: 3 mm (0.12 in)Total toe-in - Angle (left wheel or right wheel) - Degree minute (Decimal degree)Minimum In: 0° 02′ 30″ (0.05°)Nominal In: 0° 05′ (0.08°)Maximum In: 0° 07′ 30″ (0.12°)

Rear Wheels:

Camber - Degree minute (Decimal degree)Minimum: –1° 25′ (–1.42°)Nominal: –0° 55′ (–0.92°)Maximum: –0° 25′ (–0.42°)

Total toe-in - DistanceMinimum: 0 mm (0 in)Nominal: In 2 mm (0.08 in)Maximum: In 4 mm (0.16 in)Total toe-in - Angle (Left wheel or right wheel) - Degree minute (Decimal degree)Minimum: 0° 00′ (0.00°)Nominal: In 0° 05′ (0.08°)Maximum: In 0° 10′ (0.17°)