Chainring SAMOX E-bike 32h Narrow wide BCD104 aluminium black

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

Measuring the bolt circle diameter (BCD) of chainrings

For 4-bolt models: measure the distance between adjacent bolt holes

For 5-bolt models: generally use the measurement chart below as a guide.

Bolt count on chainring Distance between two different 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 spacing on the outer circle:

4-bolt:

Distance between adjacent holes ÷ 0.7071 = bolt circle diameter (BCD)

5-bolt:

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