Ketjuratas KMC E-bike Bosch BCD 104 etu musta 1/8" 3mm offset 38T

High-quality KMC e-Bike sprocket for electric bikes.
For Bosch system
42-tooth
Chain size 1/2"x 1/8"
Offset 3mm
Color: Black
Material: Durable Cr-Mo
Hole spacing/BCD 104
10,000 km warranty:
when using KMC's e101EPT chain, this front chainring and rear chainring, which
are all promised this warranty.
Measuring the hole spacing of the sprockets:
In the 4-bolt model, measuring the screw spacing:
measure the screw spacing between adjacent holes
Number of bolts in the sprocket Length between two different holes Cross spacing of the holes
mm. inches (PCD/BCD)
4 45.3mm. 1.78 inch 64mm
4 56.6mm 2.23 inch 80mm
4 62.2mm 2.45 inch 88mm
4 66.5mm 2.62 inch 94mm
4 67.9mm 2.67 inch 96mm
4 72.1mm 2.84 inch 102mm
4 73.5mm 2.90 inch 104mm
4 84.9mm 3.34 inch 120mm
Calculation chart for calculating the bolt spacing on the outer circumference:
4-bolt:
The distance between adjacent holes divided by the number
0.7071 = bolt spacing
5-bolt:
The distance between adjacent holes divided by the number
0.5878 = bolt spacing