What year Spyder do you have? Thanks for the info.
From 2013 on, when all Spyders got the (bigger & better) Brembo Brakes, it really doesn't matter what year Spyder you have when it comes to tire sizes - they're all the same, OEM fronts = 165/55R15 Kendas; OEM rear = 225/50R15 Kendas; After market tires, fronts = 155 to 175 wide, 50 to 65 profile, 15" rim dia; a/mkt rears = 205 to 225 wide, 50 to 65 profile, 15" rim dia; altho if you want to start playing with a/mkt rims &/or custom fenders etc, there are others that can fit, altho the bigger variations may cause some issues, ie, changing the rim offset too much can cause some rubbing issues despite still running the above mentioned tire sizes, as at least one member has discovered. As for the pre-2013 Spyders, they had 14" rims & BRP brakes rather than the bigger & better Brembos.
However, if you search on tires here, there's a
vast amount of info to be had if you search and spend some time reading; but as most who've explored the limits of their Spyder's performance and handling characteristics have discovered, just about any reasonable quality a/mkt tire that fits (within those size parameters above) will provide significantly better performance in all respects to the OEM Kendas & their derivatives/clones as well as increased longevity too, just so long as you run the (stronger/higher load capable/better quality control) a/mkt tires at an appropriate pressure (lower) for the lighter load of a Spyder vs the weight of a car. That said, I've yet to find anyone who is really massive enough &/or loads their Spyder heavily enough to truly warrant running pressures higher than 18 psi in their a/mkt tires, altho occasionally, some have played with going as high as 20 psi for extended high speed, heavily loaded, &/or high temperature runs, conditions where that higher pressure might not be unwarranted. Onky when it comes to the correct pressure for OEM Kendas & their clones/derivatives, almost all who've persisted with them have found that because they are so lightly constructed, they really
NEED to be within +/- 2 psi of their tire placard recommended pressures.
Still, when it comes to tires (& oils!) it really does pay to do some searching and reading - there haven't been any massive changes and there's really not too much about any of those subjects that hasn't been asked, discussed, and answered extensively in the years since Spyders first hit the streets/the SpyderLovers Forum went live.
Enjoy!
