Chainring M-WAVE SAMOX E-bike Narrow wide BCD104 steel black 34T 3/32" 11/128" 4-bolt 104m

Narrow-wide chainring with 34 teeth. Fits 3/32" and 11/128" chains. 4-bolt mounting. Color: Black. BCD / cross hole distance: 104 mm. Weight: 170 g.
Measuring chainring hole spacing
For 4-bolt models, measure the distance between adjacent bolt holes. For 5-bolt models, generally use the provided measurement table as a guide.
Number of bolts on chainring | Distance between two holes | Cross hole distance (PCD/BCD)
---|---|---
4 | 45.3 mm | 1.78 inch | 64 mm
4 | 56.6 mm | 2.23 inch | 80 mm
4 | 62.2 mm | 2.45 inch | 88 mm
4 | 66.5 mm | 2.62 inch | 94 mm
4 | 67.9 mm | 2.67 inch | 96 mm
4 | 72.1 mm | 2.84 inch | 102 mm
4 | 73.5 mm | 2.90 inch | 104 mm
4 | 84.9 mm | 3.34 inch | 120 mm
5 | 43.5 mm | 1.71 inch | 74 mm
5 | 55.2 mm | 2.18 inch | 94 mm
5 | 64.7 mm | 2.55 inch | 110 mm
5 | 76.4 mm | 3.01 inch | 130 mm
5 | 79.4 mm | 3.12 inch | 135 mm
Calculation formula for bolt circle diameter:
4-bolt: Distance between adjacent holes ÷ 0.7071 = bolt circle diameter
5-bolt: Distance between adjacent holes ÷ 0.5878 = bolt circle diameter