Chainring SAMOX E-bike 42h Narrow wide BCD104 aluminium black

Narrow wide chainring, aluminum, 42 teeth

• Fits 1/2" chain
• Chain width for 3/32" and 11/128" chains
• 4-bolt mounting
• Color: Black
• BCD/cross bolt hole spacing: 104 mm
• Weight: 0.057 kg

Measuring bolt hole spacing on a 4-bolt model: measure the distance between adjacent bolt holes. For 5-bolt models, generally use the provided measurement table as a guide.

Number of bolts in the chainring Distance between two different holes Diagonal hole spacing in mm and inches (PCD/BCD)

• 4 bolts: 45.3 mm (1.78 inch) — 64 mm
• 4 bolts: 56.6 mm (2.23 inch) — 80 mm
• 4 bolts: 62.2 mm (2.45 inch) — 88 mm
• 4 bolts: 66.5 mm (2.62 inch) — 94 mm
• 4 bolts: 67.9 mm (2.67 inch) — 96 mm
• 4 bolts: 72.1 mm (2.84 inch) — 102 mm
• 4 bolts: 73.5 mm (2.90 inch) — 104 mm
• 4 bolts: 84.9 mm (3.34 inch) — 120 mm
• 5 bolts: 43.5 mm (1.71 inch) — 74 mm
• 5 bolts: 55.2 mm (2.18 inch) — 94 mm
• 5 bolts: 64.7 mm (2.55 inch) — 110 mm
• 5 bolts: 76.4 mm (3.01 inch) — 130 mm
• 5 bolts: 79.4 mm (3.12 inch) — 135 mm

Calculation formula for bolt spacing on the outer circle: 4-bolt: Distance between adjacent holes divided by 0.7071 = bolt circle diameter (BCD)

5-bolt: Distance between adjacent holes divided by 0.5878 = bolt circle diameter (BCD)