rear rim seems to rub

My rear rim seems to rub on a brake pad when I am standing on the pedals on
steep climbs. At least that's what I THINK it is. Off the bike, everything
appears trued up well with good clearance. It's my 1998 Raleigh R500 7005
alu frame with oversized tubes.

Any theories? Any suggestions?

--
JF

"A really great man is known by three signs,--generosity in the design,
humanity in the execution, and moderation in success."
- Karl Otto von Schonhausen Bismarck


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