2x Bike ball bearing : Description : Sold by pair. Enable to replace original parts (crankshaft bearing, headsets, hubs). The diameter are measured inside and outside (it's an approximate value in mm). Details : ------- WHEEL HUB (front, rear) ------- - Diameter 13/20 mm, 7 balls (front hub) :
Outside diameter : 20 mm ; Inside diameter : 13 mm ; Number of balls : 7 ; Balls diameter : 3/16" (4.763 mm) ; - Diameter 15/25 mm, 7 balls (rear hub) :
Outside diameter : 25 mm ; Inside diameter : 15 mm ; Number of balls : 7 ; Balls diameter : 1/4" (6.35 mm) ;
------- CRANKSHAFT (traditional, BMX) ------- - Diameter 20/30 mm, 7 balls (traditional crankshaft) :
Outside diameter : 30 mm ; Inside diameter : 20 mm ; Number of balls : 7 ; Balls diameter : 1/4" (6.35 mm) ; - Diameter 20/30 mm, 9 balls ( traditional crankshaft ) :
Outside diameter : 30 mm ; Inside diameter : 20 mm ; Number of balls : 9 ; Balls diameter : 1/4" (6.35 mm) ; - Diameter 25/34 mm, 9 balls ( traditional crankshaft ) : Outside diameter : 34 mm ; Inside diameter : 25 mm ; Number of balls : 9 ; Balls diameter : 1/4" (6.35 mm) ; - Diameter 31/40 mm, 11 balls ( traditional crankshaft ) :
Outside diameter : 40 mm ; Inside diameter : 31 mm ; Number of balls : 11 ; Balls diameter : 1/4" (6.35 mm) ; - Diameter 32/45 mm, 9 balls (BMX crankshaft) :
Outside diameter : 45 mm ; Inside diameter : 32 mm ; Number of balls : 9 ; Balls diameter : 5/16" (7.94 mm) ;
------- HEADSET (standard 1", oversize 1 1/8", bmx) ------- - Diameter 27/37 mm, 14 balls (bike and moped headset) :
Outside diameter : 37 mm ; Inside diameter : 27 mm ; Number of balls : 14 ; Balls diameter : 5/32" (3.97 mm) ; - Diameter 31/38 mm, 16 balls (standard headset 1") : Outside diameter : 38 mm ; Inside diameter : 31 mm ; Number of balls : 20 ; Balls diameter : 5/32" (3.97 mm) ; - Diameter 28/39 mm, 15 balls (BMX headset) :
Outside diameter : 39 mm ; Inside diameter : 28 mm ; Number of balls : 15 ; Balls diameter : 3/16" (4.763 mm) ; - Diameter 31/40 mm, 22 balls ( oversize headset 1 1/8" ) : Outside diameter : 40 mm ; Inside diameter : 31 mm ; Number of balls : 22 ; Balls diameter : 5/32" (3.97 mm) ; Material : Steel. |