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    Yeah, mainly they're considered uncool. As to discoloration, you can always buy a new one every few years. Commented Mar 1, 2014 at 22:14
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    @user1049697 - Or it might signal that you're prudent. Commented Mar 2, 2014 at 13:12
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    Dirt and pebble tends to stuck between it and the cassette, making it sometimes allmost immposible to pedal. This ugly chunk of plastic should be broken and removed right after the bike purchase.
    – J-unior
    Commented Mar 2, 2014 at 13:33
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    @user1049697 derailleurs can get clobbered quite easily, including in bike sheds when you might not even know anything had happened. And mine certainly came in handy on the first test ride after changing the cassette and chain.
    – Chris H
    Commented Mar 3, 2014 at 9:09
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    I agree with J-unior. If you treat your bike well and test changes to chain/cassette/derailleur on a repair stand instead of the road, it's an utterly useless, Until you happen to be climbing hard, and the chain drops off inside the largest cog when you shift because your frame is flexing. So no, the claim "If you treat your bike well and test changes to chain/cassette/derailleur on a repair stand instead of the road, it's an utterly useless, ugly chunk of crap" is complete bullhockey. Ragging on spoke protectors is just more Cat 6 MUP racer elitism. Commented Jun 5, 2019 at 21:02