Originally Posted by
Martian63
Newbie here again. I just had a new chain and cassette installed at my LBS. I just noticed when I had it on the stand that when in the small chain ring and the smallest cog the chain sags down and actually rest on the chain stay. I don't ride here so never noticed it riding. Could the LBS mechanic sized the chain too long? The new cassette is an 11-28. It replaced a 12-30. I don't know enough to know if that makes a difference. Thanks guys for sharing your knowledge.
I like to use as much chain as possible on my bikes, considering that I paid for all the links, whether I use them or not.
Sometimes that makes for a loose chain in the small-small combination, but that's no loss as one shouldn't use that combination anyway. Perhaps your tech sized the chain a little long in case you switched back to a 12-30 cassette in the future.