Interco Tech

Tire Size Change Gear Ratio Calculator

Calculate the proper gear ratio for a tire size change.

Tire Size 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.

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.

Balancing Pads

Balancing Pads

Caster, Camber and Toe

Poor camber and caster alignment can cause your vehicle to "pull", and can cause tire tread to wear unevenly. Toe in won't cause your vehicle to pull, but it can cause extremely fast tire tread wear. This is why your vehicle can pull and not wear out tires, or it can drive perfectly straight and destroy them in a hurry!  Regular alignment, rotation and running the proper air pressure are essential elements in getting the most tread life out of your tires.