This chart will enable you to correctly identify the size of your chainring, crankarm spider or chainset.

Bolt circle diameter (BCD) Bolt centre to centre
56mm 32.9mm
58mm 34.1mm
74mm 43.5mm
86mm 50.3mm
94mm 55.3mm
110mm 64.7mm
118mm 69.4mm
130mm 76.4mm
135mm 79.4mm
144mm 84.6mm


BCD (Bolt Circle Diameter) is also referred to as PCD (Pitch Circle Diameter).

If you are unsure about which size to choose please contact us.