Pella Sliding Door

I have a 4.5 year old Pella sliding door that is heave to slide. it is not binding or making any noise. I removed it and the dimensions are 2 3/4 by 1 7/8, the thickness is 5/8 with a 3/8 x 1 1/2 wheel. It also has a flange. You list 2 sets of Rollers a 81-098 and a 81-244. You have in the description that the 81-244 is not the official Pella roller, but it is the one that seems to be the exact size. This door has the original rollers. When I removed rollers, they appear intact, not much play, but again a little heavy to slide. The door is heavy, it has built in blinds, 3 sets of glass. Can you tell by the photos if its worthwhile changing rollers and improve motion. Does the wear on wheel appear excess? thank you