It has the 1st fair ring part (1), the 1st fair ring part (1) has the 1st form restraint element (3) the said 1st fair ring part (1) the 2nd fair ring part (2) and in the motorcycle fair ring which form restrain is connected, the 2nd fair ring part (2) has had the 2nd form restraint element (4). The 1st form restraint element (3) is stuck in the 2nd form restraint element (4). Furthermore, in order both form restraint element (3,4) to grip, these form restraint elements (3,4) with engaging, both form restraint element (3,4) the clamp condition element which obstructs separation (10) is provided.
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