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mattyc
swmlon
The 9 and 7 are very different to the 4.
The 9 is probably more durable than the 7. The 7 looks the best, IMO.
There were a few different types of 9 and 7, both can be had with full carbon forks and BB30 bottom brackets, and both can be had with alu / carbon forks and BSA shells.