122.5 seems long. Is that required to clear the chainstays? I'm running a 107mm on an old Raleigh frame, with a Suntour XC Expert. It shifts beautifully. The XC Expert is much more competent shifting up from the granny ring than the Cyclone was.

By the way, I should have clarified: I was using the Cyclone MkII. It was an NOS item I purchased on ebay, and the box was marked 'Touring' for what it's worth. The cage may be slightly longer than the other MkII?

You never mentioned what trouble you're having...