If you're not familiar with bicycle mechanics, let your LBS make the adjustments... which, depending on why it is rubbing, could include:
1. Making sure the stoker's bottom bracket is properly centered and, if a square taper BB and cranks are used, that the cranks haven't been over tightened.
2. If the derailleur is properly aligned with the chain rings, merely adjusting the derailleur's upper limit (aka, "H") screw to keep the cage from travelling far enough to contact the cranks, while still allowing it to properly shift the chain and not drag in the big chain ring / small cog combination.
3. If the derailleur is improperly aligned with the chain rings, loosening and derailleur clamp and adjusting the derailleur so that the lower edge of the cage is parallel with and vertically aligned 1-2mm above the large chain ring's teeth
4. If the cage is bent, bending it back into proper shape and then doing a combination of 2 & 3, above.
Note: You may want to review the information on front derailleur adjustments at Park Tool's "How-to" Website: http://www.parktool.com/repair/readhowto.asp?id=75
Last edited by TandemGeek; 09-11-06 at 03:43 PM.