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:
Replacing Safety Belt System Parts after a Crash
Warning
A crash can damage the safety belt system in the vehicle. A damaged safety
belt system may not properly protect the person using it, resulting in serious injury
or even death in a crash. To help make sure the safety belt systems are working
properly after a crash, have them inspected ...
Headlamp Housing Bracket Replacement
Headlamp Housing Bracket Replacement
Callout
Component Name
Preliminary Procedure
Remove the front bumper fascia. Refer to Front Bumper Fascia Replacement.
1
Headlamp Housing Bracket Screw (Qty:? ...
Internal Components Removal
Internal Components Removal
Callout
Component Name
1
1??? Clutch Backing Plate Retainer Ring
Warning: The retainer is under tension. Use care when removing
or installing the retainer. Personal injury could r ...
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