cyqlist
cyqlist
Zeus BCD
Measuring the bolt circle diameter of a Zeus chainring. The trig constant to convert from distance between adjacent bolts to bolt circle diameter for a 5 arm crank is 1/sin(36º) = 1.7013. This measurement verifies that the BCD is 119mm, not 120mm or 118mm.
You can google and find these described as anything from 116mm to 122mm.
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Uploaded on October 11, 2011
Taken on October 11, 2011
Zeus BCD
Measuring the bolt circle diameter of a Zeus chainring. The trig constant to convert from distance between adjacent bolts to bolt circle diameter for a 5 arm crank is 1/sin(36º) = 1.7013. This measurement verifies that the BCD is 119mm, not 120mm or 118mm.
You can google and find these described as anything from 116mm to 122mm.
869
views
2
faves
1
comment
Uploaded on October 11, 2011
Taken on October 11, 2011