22.5" and 24.5" Wheels use 16" Hoses

19.5" Wheels use the 14" hoses

16" & 17.5" Wheels use the 12" hoses

Cat's Eye for Super Single Wheels Available, Call for Parts & Prices

Call 888-526-0273 Toll-Free to order (8-5 Seattle Time)

**Check Your Vehicle Manufacturer's Recommended Pressure for your Vehicles' Loaded Road Weight**

We recommend the Braided Stainless Hoses due to their greater resistance to UV, abrasion, road hazards,

and better appearance.

2 Units = 1 Axle Set Stainless Hoses 

$169.50

4 Units = 2 Axle Set Stainless

$329.50

2 Units = 1 Axle Set Rubber Hoses 

$144.50

4 Units = 2 Axle Set Rubber

$279.50

Installation / Operation Tips:

The torque limit on the Cat’s Eye bracket mounting bolt is 15 FT-LBS.

Damage or leaks can occur if mounting bolt is over tightened.

Cat's Eye System Recommends installation under "High-Torque" lug Nuts or Hub Bolts;

Not Recommended for installation under "Low-Torque" Simulator Jam Nuts.

If you have wheel simulator covers or plastic wheel liners or plastic center caps, this system may not work unless you remove or modify them to gain access to high torque nuts.

Install hoses with minimum bending and kinking.

Seals must be replaced after the second removal of the cat's eye hoses from valve stems.

Valve Stems must be in good Condition to avoid leaks,

Check for burrs that could damage the seal.

Bubble Test with Soapy water to insure no leaks and correct installation

The most common installation problem is over-tightening the hoses.

Only install hoses hand-tight plus one-half turn.

Over-tightening will damage the seals. Seals are available in the parts list below.

Do Not use Acid Wheel Wash, this will void the Cat's Eye Warranty.

When installing new or used Tires, the inside of the tire must be free of all materials, including wheel balancing compounds.

Cat's Eye is NOT Recommended for Steer Axles.

Tire Pressure is Too Important to Neglect:

Cat's Eye Tire Pressure Equalizing systems Reduce Risk of Tire Failure and

Increase Miles Per Gallon.

• Improve Tread Life - With as little as 20% under-inflation, tire tread life is reduced by 25%. When tires are maintained at an accurate inflation value, their tread will last longer.

• Reduce Maintenance Costs & Downtime - Statistics show that 90% of all tire failures are a result of under-inflation and almost 50% of all fleet emergency road-side assistance calls are attributed to tires. Accurate and consistent tire inflation can significantly reduce vehicle downtime and overall fleet maintenance costs.

• Improve Fuel Economy - Tires operated at 20% under-inflation will reduce a vehicle's fuel mileage by 2%. Considering that 56% of all commercial vehicle tires are under-inflated and that the combined mileage of a bus fleet is millions of miles per year, a 2% fuel savings represents a significant cost savings to any fleet's bottom line.

• Improve Dual Wheel Assembly Performance - When one tire of a dual wheel assembly has a lower inflation pressure than the other, its circumference is smaller than the tire next to it resulting in improper axle weight distribution and wheel drag. This condition rapidly generates heat that destroys the tire's integrity and creates the environment for catastrophic tire failures. Proper dual wheel inflation will result in better tire life and a safer trip for the driver, passengers, and vehicle.

Cats Eye Replacement Parts:  

Minimum Order $25.00, Add $10-16.00 for shipping

Tire Manufacturers Agree: a primary cause of early tire breakdown and poor tread life is under-inflation. Low tire pressure not only causes excessive heat build-up in the tire, creating dangerous driving conditions, but also shortens tire life. Unwanted heat will rapidly increase tread-wear and can tear down retreads and destroy tire casings. As much as 90% of all tire breakdowns is the direct result of tire under-inflation.

According to the tire industry, a tire that is 20 percent underinflated is considered to have been “run flat.” A tire that has been “run flat” may result in damage due to excessive side wall flexing, which can result in separation of the plies and layers leading to unexpected and catastrophic tire failure - “blowout.” Tire pressures must be checked regularly to ensure that tires are properly inflated.

Studies by the Department of Transportation (DOT) found truck drivers do not check the tire pressure for many reasons: It takes too long to check, they get dirty doing it, and the inside dual wheel is difficult to reach. All tires can be neglected but it has been shown that the further away from the driver the tire is, the more likely it is to be under inflated.

Bridgestone/Firestone conducted a study of Emergency Medical Service vehicles to examine the inflation pressures of dual-tire assemblies. Of those tires that could be checked, two-thirds were found to be underinflated by at least 20 psi, or 25 percent capacity.

Statistics compiled by Heavy Duty Trucking Magazine show tires are the number one cause of breakdowns for trucks and tractors, at 53.5%, while 48% of trailer breakdowns are caused by tires. For every 1 psi of air lost, a tire loses 60 or 70 pounds of load carrying capacity.

Aside from not being filled properly to begin with, tires lose air naturally, through a process called permeation. On the average, a tire will lose one or two pounds of air per month in cool weather, and more during the warmer months. Tire air pressure has a significant impact on gas mileage. According to the US Department of Energy and the EPA, gas mileage decreases by about 0.4% for each 1 psi drop in tire pressure. So if your tires are 10 psi low, your gas mileage will decrease by 4%. If you are getting 25 miles per gallon (mpg), that 4% translates into a 1 mpg loss.

Slightly Low pressure also causes increased tire wear, at the outer edges of the tread. More severe pressure loss causes increased flexing of the tire side walls, which can lead to catastrophic tire failure (Blow Out). Tire pressure also varies with temperature. For every 10 degrees of tire temperature change, there is typically one psi of pressure change. These general tire facts make it critical to routinely check tire pressure.

Dual Wheel vehicles have additional issues. As a weighted dual vehicle travels down the road, friction and flexing cause heating of tires and wheels. Air flow cools the outer wheel more than the inner, at the same time braking heats the inner wheels more than the outer, resulting in the inner wheel running significantly hotter than the outer. This temperature difference makes the diameter of the inner wheel larger than the outer. A case study by Bridgestone found that a 5 psi pressure change results in 5/16 inch of tire diameter change. Tire circumference is 3.14 (pi) times the diameter. So for every 5 psi difference in tire pressure, there is nearly an inch difference in wheel circumference. That difference will cause one tire to drag on the other tire about 13 ft per mile, or about 100 miles of drag for every 40,000 road mile. The added resistance makes BOTH tires wear faster and decreases MPG at the same time.

Tire Valves use International Standard threads. The standard Schrader Tire valve has the following thread: 7.7 mm OD, 32 tpi, or 0.794 mm pitch, Minor diameter is 6.9mm, Thread designation is .305-32 or 7.7-32

We have had customers with leakage problems that turned out to be related to inadequate valve stems. Quality Valve Stems are much more critical with high-pressure truck tires than auto tires.  

Read about valve stem problems at this link: 

Warning issued on faulty tire valve stems following rollover death