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Rear Wheel Axle
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Skateboard wheels are designed in many different sizes and hardnesses. Skateboard wheels are made of a rubber-like material called urethane. The size and hardness of the wheels affect the smoothness of the ride on a skateboard, how well it handles, and its speed. Skateboard wheels are normally 52 mm to 60 mm and have their own ball bearings built in. Street skateboard wheels are usually very hard, which allows them to slow down quickly and store energy as you move along. Park wheels are usually made of a softer urethane for better bite and handling. Modern skateboard wheels are bidirectional, meaning that they can be attached in either direction unlike the wheels on a car or the back wheel of a bicycle. This means that if the edges start to wear, you can flip the wheels and use them on the other side. Skateboard wheels are attached to the trucks by hex head axle bolts and ABEC (or another company's) ball bearings to provide the free-spinning movement of the wheels.
Skateboard Trucks
Trucks are axles attached to a baseplate. Most trucks are made from an aluminum alloy and they are very strong. Trucks come in many different shapes, sizes and colors. Trucks are made from cast metal and allow the skater to turn the board. Depending how tightly the nut on the kingpin is secured, the trucks can be loose or tight just like the suspension on a car. The main purpose of having trucks that are not fixed is to enable you to turn or "carve" without lifting your front wheels off the ground. The looser your trucks are, the further you will be able to lean in one direction or the other.
Skateboard Wheels
Wheels don't just keep your skateboard rolling -- they are also responsible for keeping you on your feet as you tackle different terrain. Wheels attach to the axles of the trucks with a hex bolt and there are 8 bearings, two inserted into each wheel with a spacer between. The wheels come in a variety of shapes, from 50 to 55 mm, and different hardnesses. Most skateboard wheels, like mentioned above, are made from urethane, and have a hardness rating stamped on the wheel (for example: 95a, or 100a - always with an "a" after the number). The higher the number, the harder the wheel. For example, a 101a wheel is harder than a 95a. So a good choice for street riding might be a 100a or 101a. A 95a would do well on ramps and in a skateboard park.
So, a skateboard is made up of three main parts: the deck, the trucks, and the wheels. The deck is the flat part on top (or mostly flat) where you plant your feet. The trucks are bolted to the bottom of the deck. This is your suspension and axles for the deck and wheels. The wheels bolt onto the ends of the trucks and include wheel bearings so the wheels can spin. Wheels come in different sizes and hardnesses to help you custom tailor your ride.
Dean Novosat owns and operates http://www.1skates.com
Ger free reviews, opinions, and reports on all things skateboard! Shoes, Decks, Wheels, and more on http://www.1skates.com and 1Skates.com
Saab Xwd “cross Wheel Drive” System
Saab, the Swedish automaker, has developed the XWD “Cross Wheel Drive” system, with intention to optimize vehicle handling and stability in all driving conditions. Currently, the system is being offered as an option in the 2008 Saab Turbo X and Aero versions of the 9-3 Sport Sedan and SportCombi. It is being partnered with a 280 hp (206 kW), 2.8 V6 turbo engine that produces almost 15 percent more maximum torque of 400 Nm/295 lbs.-ft.), to enhance the available traction.
The all-wheel drive system will be available with either a six-speed manual or six-speed automatic transmission. It will provide to impressive features, namely: pre-emptive engagement of the rear wheels to optimize traction at take-off; and an active rear limited-slip differential (eLSD) to allow variable torque transfer between the rear wheels.
The Cross Wheel Drive is a fully automatic on-demand system. It could send up to 100 percent of engine torque towards the front or rear wheels when necessary. Its sophisticated operation adds further sporty dimension to the driving experience with the new Saab Turbo X and 9-3 Aero XWD. It produces fine balancing of the drive torque between the front and rear axles that raises the threshold where ESP throttle and braking interventions are triggered; thus, provides more scope for intimate driver involvement.
The state-of-the art all-wheel drive system is being dominated by its own electronic control unit that works with the engine, transmission and ABS/ESP control modules. In the front final-drive, the hardware comes with a Power Take-off Unit (PTU), which transmits engine torque through a prop-shaft in the Rear Drive Module (RDM). It works with wet, multi-plate clutch units from Haldex, namely a Torque Transfer Device (TTD) and an electronically-controlled Limited Slip Differential (eLSD).
In the process of take-off, the TTD is being activated as the clutch plates are forced together under hydraulic pressure. In effect, the RDM becomes engaged. In such process, detection of wheel slip before the TTD activates is required, making it a significant improvement in the technology.
In open road cornering, Saab XWD offers enhanced and more finely balanced chassis dynamics. The data from the vehicle’s ABS/ESP sensors are being utilized. And, the programming of the system permits the application of rear drive in balancing both oversteer and understeer characteristics to optimize stability and roadholding.
For highway cruising, there is only about 5 to 10 percent of the engine torque is basically used in the rear wheels to provide a measure of greater stability and enhancement of fuel consumption.
The eLSD holds the most significant role in Saab XWD. It is the first application of an electronically-controlled, rear limited slip differential in the segment. Along with RDM, the eLSD operates through pressurized clutch plates under a principle same as with the larger TTD.
The eLSD also provides the driver better control on hard cornering and high speed maneuver. It happens through the application of either more or less torque to the wheels, helping the rear follow the direction of the front wheels. Without requiring ‘outside’ intervention from electronic stability aides and quality Saab struts, the vehicle can be kept balanced and be tightly controlled.
Fitment of a new rear sub-frame, in the process of installing the Saab XWD, is required to carry the RDM, revised rear suspension geometry and new wheel hubs for the drive shafts. Wheelbase and rear track dimensions are kept unaltered.
Currently, Saab, as a division of General Motors Corp. Saab Automobile USA, is providing premium automobiles for Saab Automobile AB, Sweden.
About the Author
Evander Klum is a Business Administration graduate who hails from Alabama. He enjoys extreme sports and he is also a car racing fanatic. At present, he works as a marketing manager at an advertising agency in Cleveland.
Where can I find a rear 36H BMX hub with a 9, 10, or 11 tooth free wheel on it and a 3/8 inch axle?
I need to replace my rear 36H cassette hub that has a 16t freewheel on it for my diamondbakc reactor expert 2007. I need a cheap hub with a 9, 10, or 11 tooth free wheel on it and 3/8 inch axles. It needs to be a 36H for my rim. Pzz tell me!!
I'm not sure if any of the major manufacturers make one that isn't shown at Dan's Comp, but they do list one from FMF that'll work for you.
http://www.danscomp.com/426112.php?cat=PARTS
I'd call them or check with a bike shop to see if there's anything else available.....very well could be. Since 3/8" isn't as popular, it could be that people don't stock them but are able to order them. Hope this helps out some.
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