Spicer Tire Matching Guidelines and Calculations Manual de usuario descargar pdf (Pagina 1)

Spicer

Axles & Brakes

ABIB-0315

Information Bulletin

Bulletin Type: Service Information

Topic: Tire Matching Guidelines and Calculations

Affected Models: All Tandem Drive Axles

Tire Mismatch is the difference in the number of revolutions a tire in a tandem set will make, typically determined in

revolutions per mile. When mismatching occurs, excess heat builds up in the axle, thus increasing wear on internal axle

components.

Effects on Axles due to Tire Mismatch are as follows:

Side-To-Side Mismatch: (Single & Tandems)

 Increases wear on wheel differential

 Differential lock-out system

Front-To-Back Mismatch (Tandems)

 Decreased life on inter-axle differential and power divider on the “D” (Forward Tandem) Head Assembly.

Dana recommends maintaining a tire mismatch no greater than 1.25% or less (see sample equation on page 2).

The best methods for measuring circumference are with a “Trammel” or “Flat Tape”. DO NOT measure from the top of

tire to ground; due to tire construction and inflation pressure this is an inaccurate method. When using a “flat Tape” for

measuring circumference, run the tape around the tire and figure the diameter. The diameter is figured by dividing the

circumference by 3.14.

NOTE: This is the only way to accurately measure the diameter.

This bulletin contains product information.

Dana Corporation is not committed or liable for canvassing existing product.

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Spicer® Axles & Brakes ABIB-0315 Information Bulletin Bulletin Type: Service Information Topic: Tire Matching Guidel

TIRE MISMATCH CALCULATION Dmax – Dmin Dmax = Larger Average Tire Circumference Dmin X 100% = Tire Mismatch Dmin = Smaller Averag

TIRE MISMATCH CALCULATION TIRE CALCULATION WORKSHEET TIRE LOCATION YOUR TIRE CIRCUMFERENCE (IN INCHES) FORMULA REFERENCE LETTERS LEFT – O

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Spicer Tire Matching Guidelines and Calculations Manual de usuario Pagina 1