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I actually pieced together a whole 7700 groupset during the slow hunt for the wheelset and that was the initial plan but for some reason then wished I’d gone 7400 and coincidentally the guy who sold me the wheels had a groupset going so bought them together.
I’ve got 7900 brake calipers on there anyway, not bothered about the mismatch and think they sort of work with this frame. Wouldn’t look right on your Look though...
greeno
If you can maybe upgrade the whole group set to 7700 series instead? Wouldn’t look too out of place.
Only saying this as the 7400 series brakes are terrible at best (even the 7403 dual pivot isn’t that great)