I bought a new bike recently and the first thing I did to to it was to remove the plastic disc by attacking it with a pair of sidecutters. I know why it's there, but I make sure that the rear mech is properly adjusted so that it doesn't shift into the spokes. I don't wish to be condescending, but I regard a plastic disc (on a decent bike) as something as a 'badge of shame'.
+1The bike snobs would call it a "pie plate" and ridicule you for still having it on your bike, and treat you like a social outcast and probably refer to you as a dork.
I personally can't see anything wrong with it and it does perform a valid function (albeit a mostly redundant one for correctly setup bikes).
I still have mine attached and couldn't care less what people think about it.
The last time I overshifted a chain into the spokes because of a poorly adjusted rear mech was about forty + years ago, so if I don't see a need for it - it need not be there. On a similar note I have three bikes; two of them do not have mudguards. I acknowledge that they can serve a really useful purpose, but if I do not intend to ride that bike in the wet, what need is there for them?Why do people take it off when it could save you a fall, chain, some paint etc..?
Wise words!You are putting an identical cassette (just one which is a little lighter); if you never experienced the chain going into the wheel before you will not require new adjustment.
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