I have the plastic pie plate on my road bike and I'm leaving it there. My name is...

X

thankyouverymuch and I ride a bicycle that I paid for, upkeep, adjust and I'll do what I want. Besides, if you have a bad derail, say from a stick or other object, it could break or throw your chain through your spokes and rip them all out on that side. I've seen it happen. With the disk, usually the chain just gets stuck down between. It's a pain to dig out but the alternative is much worse. My dork disk stays. I've had enough surgery in my lifetime and I can't respoke and true a wheel to save my life.