[jura555]

Существует три обще принятых стандарта рулевых
Cane Creek 36x45 (голубой пыльник)
Compagnolo 45x45 (Жёлтый пыльник)
TH 36x36 (красный пыльник)

"While there are many standards out there, the three most widely accepted are the Cane Creek, the Campagnolo,
and the TH standard. All three use angular contact bearings (ACB) which we find to be best suited to
handle the loads to which a headset is subjected. Each bearing uses its own proprietary ACB standard and
are of different dimensions. The bearings are not cross compatible. Cane Creek Standard integrated headsets
use a 35°x45° angular contact bearing (blue seal), Campagnolo a 45°x45° ACB (yellow seal), and TH a
36°x36° bearing (red seal). "