Chainring SAMOX E-bike 38h Narrow wide BCD104 aluminium black

• Narrow wide chainring, aluminum, 38 teeth
• Fits 1/2"
• Chain width for 3/32" and 11/128" chains
• 4-bolt mounting
• Color: Black
• BCD/cross bolt hole spacing: 104mm
• Weight: 0.057 kg

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

Number of bolts on the chainring Distance between two different holes Cross bolt hole spacing (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 circle diameter (BCD) based on outer bolt spacing: 4-bolt: Distance between adjacent holes ÷ 0.7071 = bolt circle diameter (BCD)

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