On my first road bike, back on '01, I had Shimano 105's and the Flight Deck system. It shows where your chain is on the front and back rings. I got so used to looking at those numbers/positions that I couldn't imagine having to look down at my chain to see where I was before shifting going up or down the hills. Then after a couple of years it malfunctioned and needed to be replaced, but they no longer made the part I needed. Along about that time I bought a new road bike too and it didn't come with Flight Deck. It took just a short time to adjust and now I can't imagine any other way. It is so automatic now to look down at the chain. Also the longer I ride I can just sense what gears I am in without looking down.



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