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RP23 7.5"x 1.75" fits 06 stumpy, do a search in mbtr Specialized forum and you'll find lots of posts about this combination.

Be aware that standard RP23 is 7.5"x 2", and it will damage Stumpy frame when bottoming out, it is required the RP23 7.5"x 1.75" from Cannondale Rush, or have Push modify the standard 7.5"x 2" to 7.5"x1. 75".
 

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I'm using a 7.875x2 rp23 on my 06 sworks stumpy (non carbon) without issue. Its a nice replacement after breaking the hose on my afr. I generally run it on pp1, unless we are doing a long climb.
The stock Fox brain fade is 7.75x1.75 if I recall. I tried to get Fox to reduce the stroke to 1.75 - but they would not once I informed them of my application nor would they provide the spacer to my lbs.

The 7.5x2 is an approximate replacement for the Triad on lower end stumpys and as Spaceman states needs to be stroke reduced. Good luck
 
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