A TA Criterium ring set up has a BCD of 152, six holes, for the inner ring. I think the minimum is a 46? The same bolt circle is used for the cyclo cross rings. TA also used to make a double adapter, a five arm spider which bolted to the 5 holes in the crank. I think this was a 144 BCD, but I would need to check. If any one needs any of these drop me a line.