I want to order a Blackspire stainless steel 24-tooth 5-ring 74BCD inner to replace the 30t inner oem on a 105 triple crank.

The best price is from chainreactioncycle and I will get free shipping so I want to order from them.

My problem is shown here:
http://www.chainreactioncycles.com/M...px?ModelID=495

They don't list the bcd for the 5-bolt 24-tooth ring.

As far as I can determine, if it is a 24-tooth 5-bolt ring, it MUST be 74 bcd. But I don't want to take a chance on ordering it if it is possibly the wrong bcd.

Contacting their customer service to ask this question is out of the question--they just don't ever answer.

So my question: Are 5-bolt 24-tooth chainrings sold today with any bcd other than 74mm?
Thank you.