It's said that the letter ё is always stressed. However, while browsing declension charts for numerals, if I'm not mistaken, I noticed the following:
Трёхсо́т
With a stress mark on the syllable -сот.
So, what does this mean?
- The stress is on -сот rather than on трёх-
- Both stresses are possible
четырёхколёсный
exists.