It is also common to see caster wheels or glides on the back legs of a walker with wheels on the front.
ɪɾ ɪz ˈɔːlsoʊ kˈɑːmən tə sˈiː kˈæstɚ wˈiːlz ɔːɹ ɡlˈaɪdz ɔnðə bˈæk lˈɛɡz əvə wˈɔːkɚ wɪð wˈiːlz ɔnðə fɹˈʌnt.