Ashima Aro-19 disc rotor

Quality and precision

Ashima is a young, dynamic and modern company composed of engineers and technicians who are real "two wheels" lovers. Thanks to this passion, Ashima produce the MTB and Road products of the highest quality level. The rigorous tests used for the quality assurance of materials meet all EN standards.

In order to guarantee the effectiveness and reliability of Ashima products, its team have created a specific testing machine, used in the automotive industry also, where the disc is driven around its axis of rotation and the stress loads are applied by pneumatic cylinders, controlled by computer, thus eliminating the variables on the tests applied on the complete bicycle. In addition to in-house testing, Ashima uses field-tests made professional athletes.


Features

  • 1 piece construction.
  • Mounting type: 6 bolts.
  • Tightening torque: 10-12 Nm (88.5 - 106.2 lbs)(5 mm Allen key).
  • Material: hardened stainless steel.
  • Rockwell hardness index: 47 (HRC).
  • Compatibility: all disc brake systems and 6 bolts hubs.
  • Manufacturer weight: 106 g (160 mm).


Technologies

Rockwell
The Rockwell scale is a hardness scale based on indentation hardness of a material. The Rockwell test determines the hardness by measuring the depth of penetration of an indenter under a large load compared to the penetration made by a preload. In other words: the hardness is determined on a basis of the elasto-plastic deformation of a material under the test.

  • HRC: the indenter is a diamond cone with a 120° opening angle and a 0.2 mm radius. This method is usually used for very hard materials with HB>200 Brinell hardness value.

Brinell
In order to obtain the hardness index, high pressure is applied on a material, using an indenter. Then the mark diameter, left by the material, shows a necessary value. This test is standardized by international standards in order to guarantee the comparability of hardness values for a correct evaluation of the material characteristics. In particular, this test is regulated by the ASTM E10-17 standard and Standard Test Method for Brinell Hardness of Metallic Materials.

The Brinell method provides the possibility of using two different penetrators: hardened steel and hard metal, such as tungsten carbide. Both penetrators are spherical in shape. The hardened steel penetrator test is generally considered reliable when the final value is less than 350, and 650 if the carbide penetrator is used.


Included

  • 6x mounting bolts.


Not included

  • Allen key.