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I think Sven's essentially correct, although I suspect the word "Shimano" is what we're flagging. You've got the main Shimano page that splits out into sub-pages, and every link for the sub-pages has "Shimano" in the anchor text. The problem is that it IS keyword cannibalization, in a sense, and yet it also makes perfect sense in this situation. I think this is pretty common in search pages, and probably isn't a big issue. Honestly, internal search pages and Google don't always get along in general, so it can be tricky. You could draw "Shimano" out into a header and then not use it in every piece of anchor text (it could start to look excessive), but practically speaking, I doubt it's going to have much impact either way.