Reusable Collapsible Soft water cup is required for liquid refreshments: for environmental reasons, cups will not be provided at the refreshment stations for fluid replacement.

This includes a long sleeves waterproof jacket.

It is however recommended to check the weather forecast in order to adjust the equipment accordingly.Ī weather bulletin will be published the evening before the race.įor the « EXTREME » race, the rules and regulations of Skyrunner World Series apply. Each competitor is responsible to evaluate what he/she must take along. The Race Committee does not impose any compulsory equipment except for the « EXTREME » race. – Compulsory Gear for the Matterhorn Ultraks «EXTREME» With 50-years of experience building and servicing rearends for every imaginable application, we are confident that our gear oil is an excellent choice for your next build.1 ANTONIOLI DANIEL – ITALY – M30 – 3:30:15Ģ MATHYS CHRISTIAN – SWITZERLAND – M30 – 3:30:35ģ DRAGOMIR DENISA IONELA – ROU – W1 – 4:27:36 The higher viscosity provides additional protection from high shock loads, while increased levels of extreme pressure additives help further protect the gears against scoring loads.įinally, conventional GL-6 rated gear oil is proven to work, which is why it's a requirement of our product warranty terms for all Currie axle assemblies. The higher level of extreme pressure additives mandated by the GL-6 standard protects the gears from scoring and premature wear.įor high-performance applications such as drag cars, desert trucks, circle track, or anywhere a 10-inch gear makes sense, we recommend stepping up to our 250W conventional GL-6 gear oil. The viscous (thick) base stock of the 85W-140 oil (check out the videio)provides a cushion that helps protect the gears from shock loads and clings more effectively, pulling heat away from the tooth face and preventing localized heat build-up. Just 9-years after the end of 9-inch production, in 1995, both the GL-6 standard and the test equipment were inactivated, making it unlikely that a synthetic oil manufacturer would go through the cost and effort to develop an oil to meet the obsolete GL-6 standard.īecause many of today's commercially available synthetics are not engineered with the 9-inch's requirements in mind, Currie advises using only conventional 85W-140 non-synthetic GL-6 rated gear oil in all front and rearend applications. The last 9-inch rearend rolled off the Ford assembly line in 1986, and it wasn't until 3-years later 1989 that the first synthetic gear oil, Mobile1 (GL-5 rated), hit the market.

Virtually all synthetic gear oils on the market today are only engineered to meet the API GL-5 specification, which Currie has found to be inadequate for the design of the 9-inch. The increased pressure capabilities and wear resistance found in Currie’s GL-6 rated gear oils are designed with all this in mind to ensure your rearend’s gears and bearings are adequately protected under the most severe conditions. Because of this, not using high-shear oil such as Currie’s 85/140w can lead to scoring and certain gear death, especially during extreme scenarios such as off-roading and racing.

However, strength comes at a price, as this high-offset distance creates increased sliding friction and heat across the gear tooth face. The high-offset distance increases the contact patch between the ring and pinion teeth by approximately 30-percent and is a crucial reason for the legendary strength of the 9-inch gears. The design of the 9-inch features a high-offset distance that places the center-line of the pinion gear 2.25-inches below the center-line of the ring gear, which is substantial when compared to the 1.125 to 1.5-inch offsets of other gear sets (see image below). You may hear about how synthetic gear oil provides reduced friction and wear however, it may not be optimal for your setup – especially if you have a Ford 9-inch rearend. We get asked this question almost every day, and the answer is straight up, you should only run 85W-140, API GL-6 rated conventional (non-synthetic) gear oil in a Currie axle assembly.

Extreme race gear