Mechanics and friends cant and will not tell you bearing sizes. Unless you disassemble the part and look the number on the seals. I have experienced this many times. Some bike shops will even tell you that the hub bearings cant be serviced so that they can sell you their WS>
If you view some yt you can learn how to replace your bearings. You can order through Shopee and/or lazada. You can order the more expensive ones (the ceramic bearings if your budget permits and if it is your preference:
Bottom bracket Number THK ID OD (In mm)
BB 30 PF30 6806 6 30 42
BB 386
Campy 6805 7 25 37
Shimano
Hub bearings
6000 8 10 26
6001 8 15 28
60100 8 10 26
6802 5 15 24
6902 7 15 28
Headset Number Depth OD ID Chamfer
Sample sizes only
K936H35 6.5 38 27,14 36 deg
K345H6.5 6.5 41 30.5 45
K347H7 7.0 47 35 36
K4051H7 7.0 52 47 45
Headset guidehttps://www.bike-components.de/blog/en/guides/how-to-find-the-right-headset-for-your-bike-with-shis/
Component seller especially for headset will try to sell you the whole set. But you can find the right bearing sizes and save plenty. You pay only for the bearings (this is the only one that wears out
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