I think part of the issue is the difference in languages.
In English it's Bimmer, as in TIM, JIM, etc.
But in German the letter I is pronounce like the English letter E.
The German alphabet is pronounced:
A=Ahhh, B=Bay, C=Say, D=Day, E=Aaaa, F=Eff, G=Gay, H=Hah, I=Eee, J=Yut ......
so IN GERMAN the word Bimmer *would* be pronounced BEEMER.
Beemerworld, Wadula, other Germans here, am I right??