Bicycle Headset Bottom Bracket Fork Bearings All Series 2x MTB Road Kids-Bike

Features:

and

1# 40-32mmm, inner diameter 32mm, outer diameter 40mm, steel ball diameter 4mm, commonly used in and Road bike front fork headset

2# 37-29mm, inner diameter 29mm, outer diameter 37mm, steel ball diameter 4mm, commonly used in ordinary bicycle front fork headset

3# 38-24mm, inner diameter 24mm, outer diameter 38mm, steel ball diameter 8mm, commonly used in children's bicycles

4# 31-22mm, inner diameter 22mm, outer diameter 31mm, steel ball 4.763mm, used for Bottom Bracket

5# 29-22mm, inner diameter 22mm, outer diameter 29mm, steel ball diameter 6.35mm, common bottom bracket on the market

6# 25mm, outer diameter 25mm, steel ball diameter 6.35mm, often used in rear hub

7# 21mm, outer diameter 21mm, steel ball diameter 4.763mm, often used in front hub

Specification: Material: Steel Quantity: 2PCS

The package includes: 2x bearing