Trek fuel ex 7 to low BB

manual
manual Posts: 12
edited June 2012 in MTB workshop & tech
I brought a second hand trek fuel ex7 2011 recently.
It has a Fox float-R rear shock and i measured the BB and it comes out at 30 cm, 4cm bellow the BB trek claims.
I was wondering if buying a Rp-23 would increase the BB on the bike.
any advice would be appreciated.

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