I had bought several sets of pn ks super soft front tires to use on the rear of my GLF1 last fall. I was using the 14mm pn rims and put 2 of the front tires on to make a super soft rear. As marka came out with a new tire that works on the GLF1 I stopped using the super soft fronts. So last week I was looking through my stash of tires which is getting low, due to the great tire shortage of 2020, and decided to try the super soft tires on the front of my GLR. I have been really surprised at how smooth they are. I ran my hfay race with them and ended with a personal best. I have not tried them on a large track yet, but for our little hfay track I will be sticking with them for awhile and even added a set to my evo SS car.