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
...
Other materials:
Instrument Panel Lower Trim Pad Cover Replacement (Without AAL)
Instrument Panel Lower Trim Pad Cover Replacement
Callout
Component Name
1
Instrument Panel Lower Trim Pad Fastener (Qty:?€‰2)
Caution: Refer to Fastener Caution.
2
Instrumen ...
Passenger Compartment Air Filter Replacement (LHD)
Passenger Compartment Air Filter Replacement
Callout
Component Name
Preliminary Procedure
Remove IP compartment. Refer to Instrument Panel Lower Compartment Replacement.
1
Passenger Compartment A ...
Radiator Cleaning
Warning: NEVER spray water on a hot heat exchanger. The resulting
steam could cause personal injury.
Caution: The heat exchanger fins are necessary for good heat transfer.
Do not brush the fins. This may cause damage to the fins, reducing heat transfer.
Note: Blow compressed ...
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