At 08:16 PM 1/16/2008, Richard Cielec asked:
>I purchased several new chain rings - could have been TA, I don't
>recall. The packaging included a full size (360 degrees) template of
>numerous BCD's enabling one to place the chain ring on the chart and
>assess BCD...Does anyone have an extra chart like this perhaps for sale ?
Do you want to do more than determine the BCD of a chainring? If not, it's straightforward to measure the distance between centers of adjacent holes and use Sheldon's table at
http://sheldonbrown.com/
to find the BCD. For a 6-bolt chainring like a TA Cyclotouriste, you can measure the distance between the centers of two holes across from each other to get the diameter.
Mitchell Gass
Berkeley, CA, USA