Ride Report with Rotobox RBX2 Wheels
This weekend I finally got to get in a 60-mile ride around the few twisty roads we have here. I ride this loop almost every weekend so I have almost muscle-memory on how to take some of the turns. The OEM Supercorsa SP tires and rotors/carriers were transferred from my S-wheels to the Rotobox wheels.
I found some previous posts with wheel weights and the forged Marchesini S-wheels are actually 6.5 pounds lighter than the base Enkei-cast wheels, and my shop's scale found the Rotobox wheels to be 1 pound, 2 ounces lighter up front and 3 pounds, 2 ounces lighter in the rear for a total of 4.25 pounds lighter than the S-wheels. That doesn't quite tell the whole story as the Moment of Inertia (MOI) of carbon fiber wheels is lower than metallic wheels because there is proportionally less weight around the rim of the wheel. This translates into less force to overcome when accelerating, braking and changing direction.
So what does that really mean to the riding experience? Assuming that you're within the weight range of your suspension, simply put, these are the most effective mods that you can put on a bike in terms of performance. One of the first corners on the twisty road is a 90-degree right that I can easily knee-down at about 50 mph. As I mentioned, it is mostly muscle-memory for this road. As such, when I turned in and applied the "normal" bar pressure to keep the radius of the turn, the bike turned so quickly I almost went off the road to the inside of the turn. I had to be more careful with my bar inputs as it seemed that turning effort was at least 1/3rd less than before with the S wheels.
One of the best characteristics of the 1199 I noticed when I first rode it was the ability to change lines at will within a corner. The Rotobox RBX2 wheels have exacerbated this ability, with a feeling that I could literally put the front wheel anywhere on the road I wanted, even after the bike was turned in. An analogy that expresses the difference in steering feel is that the bike now has "High Defnintion" steering feeling and precision. The agility and responsiveness is significantly amplified with only a slight increase in instability. However, the increased instability is more likely me putting in what used to be "normal" inputs with the S wheels. I can't even imagine the difference in feel if I had mounted the Rotobox set coming from the base 1199 wheels with a whopping 9.75 pounds less rotating, unsprung-weight.
Granted, at the same time I had these wheels mounted I also had the Bitbuo ECH-29 Nitrogen-charged fork cartridges installed, which likely contributed to the "HD" steering feel. However, the sag and geometry are the same as before, so I'm confident that the decrease in steering effort and precision is due to the wheels alone.
Another aspect was braking and acceleration. I actually used the brakes much less on the run down these roads because when I rolled off (EBC set at 2 as always for me) the bike slowed enough for the turns without braking. Usually I prefer to trail-brake into turns and release the brakes right before the apex. When I did increase speed enough to require trail-braking into corners, and subsequently applied the brakes, I "oversteered" again as the brakes and reduced inertia slowed the bike down even more than expected and the steering closed the radius of the corner prematurely.
All-in-all, it made a significant difference in steering characteristics. Enough so that I need to adapt to it with more riding. After 1,000 miles, I'm sure it will be natural to me how the bike steers and brakes. However, if I was to change back I would likely find the increase in steering effort and decrease in responsiveness as a negative. In my particular case, I fell outside the parameters of the stock suspension and knew it had to be upgraded first. However, if I was within its adjustment range, I would have diverted the $3,000 of upgrades to these wheels first, as the tangible performance results may have been the same if not more. Also, with a decrease in wheel weight, the OEM damping is effectively increased as well.
More pictures on the sunny Saturday ride: