TECHNOLOGY THAT MAKES V2 BETTER
Conventional Roller Skis: Most roller skis are quite simple. Many are just an aluminum extrusion that’s machined in such a manner that you can mount conventional roller ski wheels. Aluminum is a very poor vibration dampening material and when not equipped with composite wheel forks or pneumatic wheels the ride can be uncomfortable, especially on poor pavement. About the only thing that differentiates many brands using this type of construction are the logos.
With solid rubber wheels the vibration dampening of the ski is mainly a function of the shaft construction and the design of the wheel forks. For roller skis that have pneumatic tires, the primary vibration dampening is the tire and there is no need to use the more expensive composite shafts.
BENEFITS OF XLQ HYBRID CONSTRUCTION OVER OTHER DESIGNS
Better Vibration damping: Better than wood skis, better than aluminum, better thac carbon with a wood core and better than carbon with a foam core. The XLQ98 and XLQ900 skis use vibration dampening hybrid shafts and vibration dampening composite wheel forks. For additional damping we also mount the forks to the shafts with a thick, vibration dampening, high strength adhesive tape made by 3M. This tape is similar to the 3M tape that is used to mount windows in skyscrapers. The XLQ skis have five different vibration and sound-dampening materials, including closed cell foam inside the shaft and each material dampens different frequencies of vibration. The result is an incredibly smooth ride and what many skiers have told us is the most snow like feel of any roller ski on the market.
Lighter. The wheels are the heaviest part of a roller ski. Rubber is quite heavy and so are the wheel hub and bearings. XLQ shaft skis are 100 grams lighter per pair than V2’s previous very light carbon composite construction.
More snow like. Skiers tell us the XLQ are crisper and more responsive than any other roller skis and feel more like skiing on snow.
Full fenders. The XLQ 98 and 900 series composite forks have fully enclosed fenders, and they can still accept Speed Reducers and Brakes.
Dimensionally more stable. The XLQ hybrid is dimensionally more stable than wood based or carbon composite skis.
Better for the environment. There are fewer harsh chemicals involved in producing the XLQ than in making the carbon composite skis.
Aluminum Forks: The third generation of XL150 Aero and XLQ9848 forks have a geometry virtually eliminating areas of high stress. All intersections have generous radii, which reduce stress concentrations. The cold forged ribs on the XL Aero forks increase the torsional rigidity. Forging also makes the metal itself stronger. All V2 forks are made in a monolithic U shape, which makes them stronger than individual left and right forks mounted to the shaft. On the 150mm XL Aero aluminum shafts the forks are welded to the shaft, which is one of the strongest methods of securing aluminum to aluminum. U shaped forks are designed to protect the shaft. On V2 roller skis we rarely see damaged shafts. On V2 skis that have been used by novice skiers who have not yet learned how to ski properly we see the damage on the forks, not the shaft.
New Composite Wheel Forks: The forks for the XLQ98, XLQ800 and XLQ900 series have fully enclosed fenders, but are designed so that both Speed Reducers and Brakes can still be mounted. Just like the aluminum wheel forks, these are monolithic forks designed to protect the ski shafts. The composite wheel forks are made from Du Pont’s™ toughest composite material and are one of the five materials used in the XLQ models to reduce vibration.
Wheel Alignment: Most of us are not anatomically balanced, so even though the wheels and bindings are perfectly aligned, the ski might pull in one direction. Most roller ski manufacturers provide no method for wheel alignment. Some manufacturers suggest that you to bend the fork if the ski pulls to the right or left. Bending can weaken the forks. On the XL150S, 150SC and XL9848 we use a unique wheel alignment device. Simply draw a pencil line along the side of the alignment lever, loosen the nut slightly and if the ski pulls to the right move the lever forward and if the ski pulls to the left move the lever backward. It’s simple and it works. On the XLA and XLQ that use the composite wheel forks the front right wheel bolt-hole is oblong while the left hole is round with a very snug fit. If the ski tracks to the right loosen the nut on the bolt just enough so you can move the bolt forward. If the ski tracks to the left move the bolt backward.
Rolling Resistance of Wheels: The rolling resistance of tires is a function of the amount of energy the tire absorbs. Bearings have very little influence on the rolling speed of a wheel. A fast tire absorbs very little energy and uses a “high rebound” rubber. A slow tire absorbs a lot of energy and the tire becomes very hot. On a very warm day, when the pavement is much hotter than the air temperature, a very slow rubber compound will wear rapidly and can actually disintegrate like truck tires do on the highway on a hot day. V2 roller skis do not use low rebound rubber. On the W98RS, the slow wheel on the XLQ98S skate ski, we use the same rubber composition as on the W98RM, but slow the wheel down with a recently patent approved lightweight (10gram) internal speed reducer called the ISR. The ISR is exactly the size of a 22 mm bearing and on the slow wheels we simply increase the depth of the bearing bore to accept both the ISR and the bearing. This system increases the rolling resistance by about 15 / 20 %. The heat generated by the ISR is dissipated through the aluminum bearing tube and the aluminum bolt. Without using the high / energy absorption rubber we can obtain three different wheel speeds. With four W98RM wheels we have a medium speed ski, with four W98RS wheels we have a slow ski and with one W98RM and one W98RS mounted on each ski we have a medium slow ski.
Bearings: If you spin a wheel with your hand on an in line skate or roller ski with bearings that are lubricated with light oil and are not equipped with contact seals, the wheel can spin for several minutes, while contact sealed bearings with grease lubrication will stop in less than five seconds. The conclusion that most people reach is that the free spinning bearings will make the wheels much faster. In order to accurately test the rolling resistance of the wheel, the wheel must be under similar load as when the roller ski is being used. We have developed a sophisticated test machine that accurately measures the rolling resistance of wheels under load. The wheels are driven at a constant speed of 30 kilometers per hour. The machine works just like the cruise control on a car. As you encounter a hill more gas is supplied to the engine to maintain the speed. Our engine is a precise electric motor and we measure the current required to keep the wheel speed at 30 kilometers per hour deposit. The energy required to maintain the speed is measured to 1/1000 of an ampere so the test machine is extremely accurate. We have found that, under load, the non / sealed oil lubricated bearings are less than 2.0% faster than permanently sealed greased bearings.
Forged Aluminum bolts: To further reduce the weight of our premium XLQ roller skis we use custom made 7075-T6 aluminum bolts. These bolts are very strong and almost three times lighter than steel bolts. Aluminum bolts can only be used on free wheels as the extreme torque required to lock the needle / bearing clutch requires heat-treated grade 12 bolts. For the clutch wheels we use aircraft grade 12-9 bolts.
Speed Reducers: V2 roller skis have become famous for the patented Speed Reducers. Over the years the concept has been modified and improved numerous times. The latest generation Speed reducers for the AeroXL150 skis work so well that you can ski in almost any terrain.
Brakes: Our first brake, introduced in the mid 90’s, was not an elegant solution. However, in 2005 we developed a revolutionary brake that really works. In 2007 we introduced an improved version for all XL model skis. By mounting the brake to the wheel fork we were able to eliminate several parts and make the system both stronger and lighter than the Universal unit. (The US Patent Office granted the Patent for our brake system in 2010.)
Aluminum Wheel Hubs: The XLQ9848 and the XLQ98 use an advanced custom hub extrusion. We began the tooling for this extrusion in 2009 and we received the first wheels in the spring of 2010. This is a symmetrical spoke hub that is similar to the hub on many competitors’ skis. However, if you look carefully you can see the difference that makes our hub and wheels both lighter and stronger. The XL9848 wheel hubs are machined in such a manner that we can also insert the patented ISR as well as the one / way clutch housing.
Aero Roller skis: In the summer of 1999 we introduced the first pneumatic tire roller skis that actually worked. The Aero roller skis have been sold to all continents and over the years we have made many improvements. With the Aero you can roller ski on both paved and non / paved roads. Since the Aero will roll over objects and cracks in the pavement that stop other roller skis most skiers consider the V2 Aero safer than any other roller ski. Many users have told us they spend a lot more time roller skiing on the Aero than they do skiing on snow and many have also told us that without the security of the Aero they would not roller ski.
V2 has the best roller skis for all surfaces: Skiers tell us the XLQ hybrid skis are the best roller skis made for paved surfaces. For dirt roads and rough pavement the V2-Aero pneumatic tire skis and the XLQ9848 are in a class by themselves. With the patented brakes and speed reducers you can now roller ski just about anywhere.