Shimano 105 5700 10 speed and 5800 11 speed casette
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You can't just change the cassette. At the very least, you'll need a new front lever and rear derailleur too. The 11-speed cassette is the same width as the 10 speed, so if you just change the cassette, all the indexing will be off. You may need a new rear wheel too. I say may because if the wheel is a 10-speed wheel, you can't put an 11-speed cassette on it. However, if you currently have an 11-speed wheel and a 10-speed cassette and spacer, all you'd need to do as far as the wheel is concerned is remove the spacer.0
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Thanks0