Interco Tech

Tire Size Change Gear Ratio Calculator

Calculate the proper gear ratio for a tire size change.

Calculator - Metric Tire Sizes to US

Calculate the size of your metric tires to inches.

Calculator - Ring and Pinion

Calculate your gear ratio using the tooth count on your gears.

Calculator - Speedometer Adjustment for Tire Size Change

If you changed the size of your tires but didn't re-calibrate your speedometer, you'll want to know how far off it is. Use this calculator to figure that out.

Gear Ratio / Tire Size Table

This table shows the numeric change when you change your tire size.

Tire Mounting and Balancing

This information helps you in understanding some of the factors involved in proper balancing and that a tire is never 'out of balance' as much as the number of ounces of weight required to 'balance' it using conventional balancing equipment.

Tire Maintenance

The things you can do to assure getting the long life built into the Super Swamper TSL tires.

Conditions Affecting Tire Wear and Tire Mileage

There is always a trade off between performance and tread life in the development of tires. To gain one thing you have to trade off something else. Some brag when they get 15000 miles out of a set of tires because they understand how hard they drive.

The Basics of Tire Measurement

Tires being flexible products are affected by many variables, so tire manufacturers use a standard method of measurement.  The results of these measurements are the rounded off numbers molded on the tires.  In posting these dimensions tires are mounted on what is called the “Design Rim”.  The Design Rim is the rim that has been calculated to be the optimum or best all-around rim for a given tire.  The tire to be measured is placed on the design rim, inflated to the maximum pressure shown on the sidewall of the tire then laid flat for 24 hours at room temperature.  Then the air pressure is r

Why a Tire is Classified as Blemished

Tires are cured in molds at high pressure and temperature. After the tires are removed from the molds the tires are carefully inspected and if any imperfection, no matter how insignificant, is found by the inspector that tire will be classified as a blem. The imperfection can only be cosmetic in that if a flaw in the tire is found to be other than cosmetic the tire must be scrapped. Tires manufactured for highway service are DOT (Department of Transportation) approved.