Added a new chain, for the first time, last week. Through my own inexperience I ended up one link shorter (105 links of KMC X10SL) than what my bike came with (106 link of Shimano 5600). Take a look at my pic. Is it too short?
I've noticed that my running gear is a bit noisier, but I also have new wheels and cassette (cassette that wobbles a bit - I am going to work on that today). With the original chain at 106 I could get away with the big-big combination, but with the new chain I get a lot of noise in that combo. Actually a lot of noise with the big to 25, 23 and even 21. Noise gets less as a go from big to small cogs in the rear.