Chainring SAMOX E-bike 40h Narrow wide BCD104 aluminium black

• Narrow wide chainring, aluminum, 40-tooth
• Fits 1/2" chain
• Chain width for 3/32", 11/128" chains
• 4-bolt mounting
• Color: Black BCD / cross hole spacing 104mm
• Weight: 0.057kg

Measuring bolt circle diameter on 4-bolt models: measure the distance between adjacent bolt holes. For 5-bolt models, use the provided measurement chart as a guide.

Number of bolts on the chainring
Distance between two holes Cross hole spacing mm inches (PCD/BCD)

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

Calculation formula for bolt circle diameter:

4-bolt:

Distance between adjacent holes divided by 0.7071 = bolt circle diameter

5-bolt:

Distance between adjacent holes divided by 0.5878 = bolt circle diameter