Which tyres ??

[uclown2002]

You are over-thinking this!
Please go get some 28mm and put them on.
The overwhelming advice upthread is they will work!

 

[raleighnut]

19mm rim means 28mm tyres will fit on, the lad at Halfrauds didn't know so took the "safety option" and said no simply to cover himself from any comeback, well done to him. He was wrong though.