I checked the chainstay and i basically just measured from CC of the quick link to the crankset CC and it came up as 42 cm. The result was 55 or 56 links depending on whether i typed in fixed chainstay length or adjustable chainstay length. I don`t know what the difference is. I have 50/34 and derailleur trx. I am however scrathing my head because the chain i am looking at says 116 links which is nowhere near the required number of links in the converter for one piece of chain. DOH