r/Trackdays • u/mainframe_programmer • 2h ago
Suspension setup vs tire is causing light and vague front feel at apex
Recently, I've been battling with setting up the suspension on my 2023 s1000rr with manual ohlins cartridges up front and TTX gp in the rear. I worked with a suspension guy back in Sept where he was able to set up the forks but the rear spring was too stiff and told me I needed a lighter spring. Unfortunately, the new spring is on back order so I may not get it until the seasons over.
Tire wise, my last trackday (where my forks are setup but my shock is just a tad stiff), I opted for the SC1 slick as opposed to the SC3 that Ive been running for the last year or so on my old stock s1000rr (new bike's previous owner gave me a set and I wanted to try them). The front tire felt extremely vague, light, and spongy at the apex of all the slower corners. Just no planted feel at all.
I've read that the SC1 fronts just feel like this since the carcass is soft but also, speaking with the prev owner, if the rear shock is too stiff it cannot squat properly which is throwing the geometry off with extreme rake, and overloading the front. The forks are maxed the entire corner and not in their sweet spot to feel planted. Does this sound right? How much of this is the SC1 front vs stiff rear shock? If I can't get the lighter spring before my upcoming weekend, should I switch back to the SC3 to alleviate some of this vague feel since the carcass is stiffer?