What is BCD for crankset rings

[dan1978]

I have an exage 500lx (fc m500) crankset and I need new rings. I have been offered some SG X rings @ 110/74 BCD. Will these fit, the current rings are Shimano SG C

 

[cce]

yes.

 

[cce]

yes.

 

[dan1978]

thanks for that

 

[We_are_Stevo]

Just copied this from an eBay listing; useful for future ref.

THE CHART BELOW WILL HELP YOU DETERMINE IF THE BOLT CIRCLE DIAMETER (BCD) OF THIS RING IS COMPATIBLE WITH YOUR CRANK

5 hole chainrings:

Distance (x) BCD

34.3mm > 58mm
43.5mm > 74mm
55.4mm > 94mm
64.7mm > 110mm
71.5mm > 122mm
76.4mm > 130mm
79.5mm > 135mm
84.6mm > 144mm

4 hole chainrings:

41.0mm > 58mm
45.3mm > 64mm
48.1mm > 68mm
73.6mm > 104mm
79.2mm > 112mm

MEASURE THE DISTANCE BETWEEN TWO OF THE BOLT HOLES ON YOUR CRANK, FIND IT ON THE LEFT HAND SIDE OF THE CHART AND THE CORRECT BCD WILL BE ON THE RIGHT.

 

[dan1978]

very helpful already emailed it some mates having the same problem.
Thanks for that