Hi guys. I used to have a Specialized Allez SE bike with a Shimano 105 group. I always had trouble going from 2nd to granny gear (chain would slip off). Long story short, I sold that bike and got a Specialized Dolce Comp which came with the same Shimano 105 group. Same problem (I didnt change the bike because of chain issue LOL )... my partner has Ultegra and this issue never happens to her (Both of my bikes had triple crankset, hers' a double comp).

I was wondering if I upgraded a couple of components to Ultegra, if this slipping chain problem when shifting gears would go away? Any opinions? And if yes, what components would need to be replaced?

Im an idiot when it comes to this kind of stuff... I just like hopping on the bike and riding it! I bring bus money in case of flats instead of tube repair stuff