ISB MH-P08H8 TH-870 Bearing

The steering of the bicycle is the mechanism housed between the fork and the frame that in turn houses the bearings that allow the fork tube to rotate, allowing the lateral movement of the front wheel and therefore, the change of direction of the bicycle. To know what type of bearing to use, it is necessary to know that there are 2 types of directions depending on the way it is attached to the frame and the type of power used. The named “threaded” and the “non-threaded” (threadless) or ahead where the fork tube is completely smooth, without any thread.

When talking about the different types of ahead directions, reference is made to the different ways of housing the bearings in the frame, depending on how it is built, to the headset pipe:
- Conventional directions: in frames without internal space to place the cups in which case the bearings are mounted in the external cups
- Semi-integrated directions: in frames that do allow the steering cups and the bearings to be mounted.
- Integrated directions: in which the bearings are mounted directly, without resorting to the use of cups.

These bearings have a special design different from the conventional one that visibly incorporates slight chamfers both inside and outside, whose measurements are determined by the different angles degrees. therefore, to choose the most suitable bearings for our headset, it is necessary to take into account the measurements of the inner diameter, the outer diameter, the height and the contact angles with each of the chamfers. if we take, for example, the isb 45º / 45º mh-p08 bearings indicated for ahead directions, the first 45º measurement refers to the internal angle and the second 45º to the external angle. in any case, this information is usually engraved on the outer ring of the bearing itself. bearings located in these types of directions are usually sealed. this avoids recurring maintenance since the grease remains inside, preventing wear on the balls and extending their useful life. the sealing protects them in addition to the usual pollutants, temperature, dust, humidity, etc ... despite the fact that the bicycle market includes a large number of options for different types of directions, the isb brand offers a wide selection of measurements and contact angles that place it among the favorites of the most demanding specialist workshops.


Specifications:

Dimensions (mm):
- Inner: 30.5
- Outer: 41.8
- Width: 8

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