Bicycle Disk Brake Diameters

The disk brake is one of the main types of bicycle brake systems. Just like the coaster brakes, drum brakes and rim brakes, this system makes cycling a safer activity. It is made up of a metal disk, which is actually connected to the wheel hub. Aside from bikes, the efficiency of this system makes it a preferred choice for motorcycle owners. Additionally, it is also interesting to learn something about the bicycle disk brake diameters.

The Diameter of Bicycle Disk Brakes

The standard diameter of bicycle disk brakes is 8 inches or about 203 millimeters. Besides this, there is also a smaller version, the diameter of which is about 6 inches or 150 millimeters. Next to this is a slightly bigger version, which has a diameter of 7.28 inches or 185 millimeters. Bikes feature any of these three basic disk brake measurements.

Additional Facts and Other Interesting Details

Disk brakes are highly efficient in various conditions including in snow, mud and water. Because of their efficiency and durability, this particular type of brake system is widely used in off-road bikes. For the same reasons, owners of touring bikes and hybrid bikes prefer to use them as well. Compared to rim brakes, this system has greater mechanical advantage because the disk is squeezed harder.

The rotor holes found in disk brakes give bicycles better stopping power even in wet conditions. It is better to go mountain bike riding with this brake system available because it fits perfectly well the more aggressive types of cycling such as the downhill and free ride biking. More importantly, they need less maintenance and can perform efficiently even in different weather conditions.

The most common forms of disk rotor mounting include the Cannondale’s 4-bolt pattern, the center lock as well as the International Standard option. Aside from these, it is also possible to use other forms like the Rock Shox 3-bolt pattern, Hope Technologies’ 3-bolt pattern and Rohloff’s 4-bolt pattern. Disk brakes are available in two main types, namely the hydraulic and the mechanical versions.

In terms of weight, disk brakes are heavier compared to rim brakes. In addition, they are also more expensive. They also need a fork or bicycle frame for the calliper and a hub for the disk itself. This kind of system applies more stress on the spokes of a wheel. The torque of this system is situated right between the rim and the hub. For this reason, bikes using this brake system have stronger spokes, which then lead to more expensive and slightly heavier wheels.

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Dimensions of a Fresno Scraper

Dimensions of a Fresno Scraper

Since its invention in 1882, various Fresno scraper sizes have emerged. However, the one invented by James Porteous came with a front board measuring 8 feet wide by 2 feet high and fitted with metal cutting edge.

Porteous’ design also had a short end board. There was also a tailboard where the operator would stand. Dirt was hauled by folding the front board. The hauled dirt would be stored by the end boards.

History

Porteous invented the scraper because he saw how the Central San Joaquin Valley depended on irrigation. As Porteous worked on his design, he revised it numerous times.

He even exchanged ideas with Abijah McCall, Frank Dusy and William Deidrick. Those three inventors were designing their own scrapers, but Porteous bought the rights to all their designs. Thus Porteous got the sole patent for
the Fresno Scraper.

From 1884 to 1910, several Fresno scrapers were created at the Fresno Agricultural Works. The scraper would be used on road and railroad grading, construction, land leveling and agriculture. The scraper also played a role in the building of the Panama Canal. It would also be used during World War I. Eventually the design concept would spread and influence other earth moving equipment.

Design and Usage

While the Fresno scraper size would change, its basic design remained the same. The device laid the foundation for the contemporary earth moving scrapers. The Fresno scraper was notable for being able to move and scrape soil. It could also discharge the soil at a specified depth. It meant the volume that could be handled quadrupled.

The blade would gather the soil. It would run on a bowl that could be modified to change the bucket angle to the ground. This allowed the scraper to deposit dirt to low areas. The concept revolutionized the industry. Such was the impact that it influenced the design of modern earth movers.

Other Information

Porteous got Patent No. 261,759 for his invention, which was called the dirt scraper. It later became known as the Fresno scraper after Fresno, Los Angeles, the city where Porteous invented it. To this day the shop that Porteous created is still running.

Whatever the differences in Fresno scraper sizes are, one thing is certain: it is one of the most vital civil engineering and agricultural tools ever made. In 1991, the importance of the Fresno scraper was recognized when it was enshrined as an International Historic Engineering Landmark.

Glider Wing Dimensions

Glider Wing Dimensions

Often referred to as a sailplane, a glider is designed primarily for the special sport called gliding. It comes in different types, the most common of which are the paragliders, hang gliders as well as motor gliders. Aside from these basic facts, there are more to learn about it including the different glider wing dimensions.

Pounds to Kilograms

Pounds to Kilograms

It is sometimes necessary to convert pounds to kilograms. In practical usage, one looks at these two as just two different ways of measuring weight. In reality, you are actually converting a unit of weight into a unit of mass and vice versa when you do these conversions.