Chevrolet Sonic Repair Manual: Tire and Wheel Balancing (Collet Cone Selection)

Important:

Never use the hub cap bore to center the wheel onto the balancer. The pilot bore (on the hub side of the wheel) is machined to be concentric to very tight non - standard tolerances. The bottom cap bore is not machined to this same degree of precision.

• Accurate machine mounting is critical for achieving accurate RFV readings and proper balance.
• Flange plate mounting MUST be used for plastic clad wheels. Select the flange plate with the correct pins and set the pins to the correct hold circle.
• Mounting surface of the wheel must be clean and free of dirt, corrosion, burrs, paint, etc.
• A centering check must be performed any time a new wheel / collet configuration is set - up on the machine.

Hunter Equipment: Collet Selection

Select the appropriate collet. If using a Hunter Equipment with GM software, it will provide the color collet which should be used.

• Hunter's collets will work on other manufacturer's equipment – at least on ones with the same shaft diameter. These should be used if at all possible. Other manufacturers may also be producing similar collets.
• GM Wheels are designed for back coning ONLY. Use the size cone that contacts the center bore of the wheel nearest the center of the cone. Be sure the cone does not bottom out.
• A cone should be used to achieve the best centering on the machine.
• If the best fit cone sits deep within the center bore, this can reduce the center spring's push against the center cone and compromise centering. When this occurs, position the spacer washer between the pressure spring and the cone.

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