A downhill bike (also known as a declining mountain bike) is a full suspension bike designed for biking down a very steep and rocky path. Unlike typical mountain bikes, durability and stability are the most important design features, compared to the lighter and more versatile cross country bikes. Downhill bikes are primarily intended for high speed, and decreased riders will usually drive, or shuttle via a chairlift or motor vehicle, to the trailhead. Downhill bikes have in common with freeride bikes because of the great skeletons and increased travel.
Video Downhill bike
Geometri
This bike will also have a very sagging head tube angle (66 degrees or less), long wheelbase (over 45 inches or 1,143 mm), and will accommodate the use of tires measuring up to 3 inches (76.2 mm). Decreasing frameworks are also built to cope with the stresses of climbing rocky terrain, falls, and jumps. The weight of the bike is usually over 34 pounds (15.4 kg), but the modern downhill bike has broken through a 30 pound (13.6 kg) weight barrier (with some special builds on a carbon frame weighing between 27-29 pounds) Some newer ones (2014/5) downhill bikes can be built weighing under 30 pounds (13.6 kg), such as Session Trek 9.9 or Kona Supreme Operator.
Adjustable head angle tubes are also available to fit the bike with the owner's preferred driving style.
Maps Downhill bike
Components
Suspension
It will typically have a 7-10 inch (178-254 mm) rear suspension ride, and is designed around a 7-8 inch (178-203 mm) suspension fork. The down suspension is also much higher than the cross country bike (25% -50% of the total vs. 10% -20% travel) for a more flexible ride at a higher speed.
Fork
Other innovations include the use of a standard OnePointFive head tube, which uses a 1.5Ã, wide (38 mm) wide steerer tube instead of the more conventional 1.125 in (29 mm) diameter, to increase stiffness and strength. Most bicycles go down with a double fork that allows longer trips ahead (typically 203 mm or 8 inches and increases the rigidity that can not be offered by a single canopy fork), however, there is an increase in weight and a reduction in circle rotation.
Brake
Decreased motors usually have hydraulic disc brakes, and discs may be 200 mm or larger.
Drivetrain
Decreased bikes usually have chain guides to prevent unintentional chain interruptions. Some manufacturers are experimenting with internal gearboxes to improve reliability.
Ban
Decreased bikes require very strong tires and wheels, so it's usually 26 ".
Materials
Decreased bikes are usually made of aluminum alloy or carbon fiber.
See also
- Mountain bikes
- Mountain biking
- Downhill mountain biking
- Bicycle suspension
- Single track (mountain biking)
- Glossary of cycling
- Outline biking
References
External links
- "Brief History of Mountain Bikes" by Jobst Brandt
Source of the article : Wikipedia
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