Chevrolet Sonic manuals

Chevrolet Sonic Repair Manual: Scrub Radius Description

Chevrolet Sonic Repair Manual / Chassis / Wheels/Tires / Wheels / 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:

Drivetrain and Front Suspension Frame Replacement
Special Tools EN-45059 Angle Meter For equivalent regional tools, refer to Special Tools. Removal Procedure Support the radiator and condenser from above using the upper brackets on each side. Raise the vehicle on a hoist. Refer to Lifting and Jacking the Vehicle. Re ...

Park Brake System Description and Operation
System Component Description The park brake system consists of the following: Park Brake Lever Assembly Receives, multiplies, and transfers park brake system apply input force from driver to park brake cable system. Releases applied park brake system when lever release ...

SIR Disabling and Enabling
SIR component location affects how a vehicle should be serviced. There are parts of the SIR system installed in various locations around a vehicle. To find the location of the SIR components refer to Supplemental Inflatable Restraint System Description and Operation. There are several reason ...

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