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You'll need to change the chainwheels and the cranks, the rear derailleur, the brake-shift levers, the cassette and the chain of course. The rear wheel probably has an older hub but then if you're lucky and the hub is designed for 10-speed as well it will also take 11. The brakes won't need changing but then the newer ones are designed for less friction in ...


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This page has the best answer I've found so far http://blog.artscyclery.com/science-behind-the-magic/science-behind-the-magic-drivetrain-compatibility/ Reading between the lines, the cable pulls from 9spd to 11spd are probably close enough, but the derailleur ratios are significantly different. 1.4 vs 1.7. This means that the 11 spd indexing in your new ...


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If it were me, part of any upgrade would involve addressing the question of future-proofing the bike, for example so that parts going forward are easier to obtain. I'm afraid that, in your case, this means I would be looking at going beyond 9-speed. You mention 105/Ultegra and Dura Ace - well, these are all now 11-speed setups so straight away you're ...


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All newer 105/Ultegra/Dura-Ace are 11 speed, so they would not be compatible with your 9 speed derailleur. I believe you'll have to find some old ST-5500 levers if you want 9 speed 105. The current generation is 5800, so that's 3 generations old. I agree with @Batman, that it probably makes sense to go with current generation 9 speed shifters. Even the ...


3

Current 105/Ultegra/Dura-ace are more than 9 speed, so you can't use them. Plus, the old 105 or tiagra 9 speed shifters you'll get are probably the same as the current Sora shifters anyway, due to trickle down technology (just with tiny modifications and a price premium). So, in short, if you're sticking with 9 speed, don't bother -- you'll just pay more ...



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