Chevrolet Sonic Repair Manual: Scrub Radius Description
Ideally, the scrub radius is as small as possible. Normally, the SAI angle and the centerline of the tire and the wheel intersect below the road surface, causing a positive scrub radius. With struts, the SAI angle is much larger than the long arm/short arm type of suspension. This allows the SAI angle to intersect the camber angle above the road surface, forming a negative scrub radius. The smaller the scrub radius, the better the directional stability. Installing aftermarket wheels that have additional offset will dramatically increase the scrub radius. The newly installed wheels may cause the centerline of the tires to move further away from the spindle. This will increase the scrub radius.
A large amount of scrub radius can cause severe shimmy after hitting a bump. Four-wheel drive vehicles with large tires use a steering damper to compensate for an increased scrub radius. Scrub radius is not directly measurable by the conventional methods. Scrub radius is projected geometrically by engineers during the design phase of the suspension.
Replacement Wheels Description
Replace the wheel if any of the following conditions exist:
The wheel exhibits excessive runout.
The wheel is bent.
The wheel is cracked.
The wheel is severely rusted.
The wheel is severe ...
Spare Tire Kit Installation
Installation Instructions Part Number
95280943
Procedure
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Other materials:
Instrument Panel Accessory Upper Trim Plate Replacement
Instrument Panel Accessory Upper Trim Plate Replacement
Callout
Component Name
Preliminary Procedure
Remove the instrument panel center molding. Refer to Instrument Panel
Center Molding Replacement.
1
...
Front Brake Shield Replacement
Removal Procedure
Warning: Refer to Brake Dust Warning.
Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
Remove the front tire and wheel assembly. Refer to Tire and Wheel Removal
and Installation.
Remove the front brake rotor. Refer to ...
Draining Fluids and Oil Filter Removal
Place a drip pan underneath.
Remove the oil filter cap (1).
Remove the oil filter cap seal (2).
Remove and properly dispose of the oil filter insert (3).
Re-install the oil filter cap.
Remove the oil drain bolt.
Drain the engine oil into the drip pan.
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