The fastest fork bag on the market... Even compared riding without fork bags?
We tested the FORK BAG / 01 against a reference setup without fork bags and a classic round 3L fork bag, using a standardized outdoor aero protocol: multiple runs in both directions on the same course, controlled system weight, speed sensor (not GPS), and stabilized rider position on aerobars.
The round fork bag came in at 37 dm² CdA. The no-bag reference at 32 dm². The FORK BAG / 01 at 29 dm².
That’s not a rounding error. The complete system (rider, bike, and bag) was measurably faster with the fork bag fitted than without anything on the fork at all.
At 33 km/h, the FORK BAG / 01 required 15W less than the bare reference setup, and 39W less than the round bag. Over a 100km course at 200W, that’s 4+ minutes gained over riding with nothing, and 11 minutes over the round bag.
But, something to take into account is, that these numbers belong to this setup. One gravel bike, one rider, aerobars, a full frame bag, these exact bag positions. A different fork geometry, wider tires, a different body position, any of these can shift the result. Aero is always a system output, not a product spec. We’re not claiming 29 dm² for every bike. We’re showing what happened on this one.
What’s interesting is that the gain likely doesn’t come from the bag itself in isolation, it can’t have “negative area.” The more plausible explanation is what the bag does to the airflow around it. The narrow, wedge-shaped profile sitting close to the fork appears to redirect air more cleanly through the area of the front wheel and legs, creating less turbulence where the legs pass through during pedaling. The bag adds drag in one place and seemingly reduces it elsewhere... and in this test, the balance came out positive.
It won’t replicate identically on every setup. But the direction of the result, and the margin, are hard to ignore.
Study conducted by
@patrickzasada .
Photos by
@pataspts 
