We have been testing a lot with the 48mm WP AER fork on the FC and SX-F models lately. As much as it is odd for me to say this, the AER fork actually has comfort when the rider is on the rough line. Yes, that is correct, I am admitting that an air fork has comfort! I have been very critical on air fork technology in the past, as all of the previous air forks that I have tried have failed in my eyes. The AER fork is not yesterday’s air fork. On acceleration bumps where the fork is light and in the top of its stroke the fork is plush and will not deflect. Mid-stroke harshness that plagued the WP 4CS is not as apparent with the AER fork. We started the fork pressure at 10.6 bars and that left us with a fairly comfortable ride but still soft for me on a jumpy track. We ended with a best setting of 11 bars and that held the front end up enough on hard landings and on de-cel. What is so unique about the AER fork is that when you go up in air pressure, the fork action doesn’t get “that” much harsher. Other air forks either dive under braking (soft setting) or when raising the pressures (stiffer setting) gets very harsh through the mid-stroke. It usually is very tough to find a base setting for different types of tracks with other air forks. There is still a little harsh spot on de-cel through the mid-stroke of the KTM 250 fork, but increasing (faster) the rebound up a click or two helps this some. Doing this will let the KTM 250’s front-end feel more planted and get you added front wheel traction. Does the AER fork give you more traction than a spring? No, it still doesn’t give you that real positive feeling on lean angle (like a KYB SSS fork), but WP has gave all of us riders hope in air fork technology with the AER setting. We set the sag on the shock at 106mm and it felt like it gave a nicely planted/squatted feel out of corners. It is a little soft for heavier 250F pilots over 170 pounds, but stiffening the high speed compression a half a turn and increasing low speed compression a couple clicks helps hold the rear end up on jump faces/landings. Once you do this it will take a little forward bite out of the rear end on choppy acceleration bumps, but the trade off you get up jump faces/landings is worth it.