Chevrolet Sonic Repair Manual: Tire and Wheel Balancing (Road Force Variation (RFV))

Chevrolet Sonic Repair Manual / Chassis / Wheels/Tires / Wheels / Tire and Wheel Balancing (Road Force Variation (RFV))

ALL wheel/tire assemblies must have a RFV within spec before being mounted on vehicle.

Important:

If a wheel/tire assembly is not within the RFV specification after match mounting, the tire must be returned to the tire manufacturer. DO NOT install tire/wheel assembly on a vehicle if it exceeds the RFV specification.

RFV is unrelated to tire balance.
RFV is identifying the stiff portion of the tire and determining if it is within spec.
If RFV is too high, it will result in a vibration condition.
Do not attempt to measure RFV on tires that have temporary flat spots. If necessary, drive the vehicle to relieve the flat spots.
Prior to measuring for RFV, the tires must be inflated to the specification on the label.

Passenger Cars (including Crossover Vehicles) = 18 lbs.
Truck Tires: (P) - metric = 24 lbs.
(LT) - metric = 35 lbs.

It is recommended that RFV measurements are made prior to installation of balance weights. Once adequate road force levels have been achieved, move on to balance the assembly.

Tire and Wheel Balancing (Collet Cone Selection)

Important: Never use the hub cap bore to center the wheel onto the balancer. The pilot bore (on the hub side of the wheel) is machined to be concentric to very tight non - standard tole ...

Tire and Wheel Balancing (Wheel Pilot Bore Greasing)

Beginning with MY 2011 vehicle, pilot bore grease should be applied. To enable this, grease must be applied to the pilot bore to prevent the wheel from seizing onto the hub. Refer to Adhesi ...

Other materials:

Wheel Alignment - Steering Wheel Angle and/or Front Toe Adjustment
Ensure that the steering wheel is set in a straight ahead position. Loosen the tie rod jam nut (1). Adjust the toe to specification by turning the inner tie rod (2). Refer to Wheel Alignment Specifications. Caution: Refer to Fastener Caution. Tighten the t ...

Positive Crankcase Ventilation Pipe Removal
Open the 2 positive crankcase ventilation pipe retainer clips (2) and (3). Note: Move retainer clamp (1) in direction of the arrow. Remove the positive crankcase ventilation pipe from the intake manifold. Loosen the charger air bypass val ...

Timing Belt Inspection
Special Tools EN-6340 Locking Tool EN-6628-A Locking Tool For equivalent regional tools, refer to Special Tools. Removal Procedure Remove the timing belt upper front cover. Refer to Timing Belt Upper Front Cover Removal. Set the crankshaft balancer in the ...

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