It seems the 32mm gp5000 isn't really wider than the 28mm gp4000. Someone had measured the 32mm to be 31,25mm on a 17,5mm rim. The old 28 was about 31mm wide too.
got a link to that?
http://www.yksivaihde.net/site/foorumi/topic.php?id=85&page=168#post-886725
@gillies started
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It seems the 32mm gp5000 isn't really wider than the 28mm gp4000. Someone had measured the 32mm to be 31,25mm on a 17,5mm rim. The old 28 was about 31mm wide too.