I know the feeling.
I've had it twice now...
I've woken up at night worrying about cassettes...
You can take it back to the store and see what they can do for you, and if you are not satisfied, politely and calmly ask if you can return the bike (seeing there is a different wording on the contract and in the store). If they only give you credit, can they order in a size smaller?
If you can't exchange - instead of a shorter stem, I had a steeper angle installed on my overlong bike #1.
Saddle position - has it been moved enough forward? However, there are limits to this (i.e. when your kneecaps are forward of the pedal axle)
To be honest: after 2.5 years I decided to sell it, mainly because I wanted aerobars for tris - there was no way this was going to work.



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