pronunciation - Short i stressed and unstressed in English accents without weak merger

According to all English vowel chart, there is only one short i sound, so, it is the same sound in posItion and in rosEs, in the accents without the weak merger ?
Thanks

Answer

The quality of the KIT vowel in position and roses (for speakers who use a KIT vowel in such plurals) is likely to be slightly different, at least in terms of length. However, it is the same phoneme in both words for such speakers. The two phonetic vowels which might occur in each word would be allophones of the same phoneme. So such speakers would recognise the vowels in position and roses as being the same vowel, namely the KIT vowel:

• pəzɪʃn


• rəʊzɪz