Originally Posted by
kommisar
Oh, this looks promissing! Coming from below instead of from above. Does the frame / bb have to have anything special to use one of these?
Older Specialized FSR XC bikes (2001-2004, possibly others, and many of the Early Sp. Enduro bikes too) use a similar mount system and come set up for a 42 or 44T Derailleur height and correct chain ring curve... example pic... the der. is located to the seat tube with a half-round that sometimes has a plastic shoe that adapts to either 31.8 with shoe, or 34.9mm sans shoe... this particular one has the outboard locating screw tab too... Example pic...
https://www.ebay.com/itm/25577019629...79c8d44e036ae4