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:
Tire Pressure Indicator Sensor Learn
Special Tools
EL-46079 Tire Pressure Monitor Diagnostic Tool
EL-50448 Tire Pressure Monitor Sensor Activation Tool
For equivalent regional tools, refer to Special Tools.
Learn Mode Description
The tire pressure monitor system uses the instrument cluster, body control
module (B ...
Engine Flywheel Removal
Special Tools
EN-652 Flywheel Holder
For equivalent regional tools, refer to Special Tools.
Install EN-652 holder (1) to hold the engine flywheel (2).
Remove and DISCARD the 6 engine flywheel bolts (2).
Remove the engine flywheel (1).
...
Transmission Replacement (With 1.6L or 1.8L Engine)
Removal Procedure
Remove the battery tray. Refer to
Battery Tray Replacement.
Without draining the coolant or removing the hoses,
remove and position aside the radiator surge tank. Refer to
Radiator Surge Tank Replacement.
Remove the transmission range selector lever c ...
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