I think he meant to ask: What tire options are there other than stock.
If that's the case, then all it takes to find the answer is to do some searching and reading here - appropriate tires and sizes have been discussed and contemplated and argued and there's literally thousands of people successfully using a range of alternatives... All you need to do is look.
That said, please be aware that the OEM Kendas and
all of their clones, including the latest XPS versions, are
NOT made to 'roll on the sidewalls', they are basically just lightly constructed, weak sidewalled, poorly quality controlled
radial CAR tires; so the answer to that question, if it really
is the question, is '
any Radial car tire of an appropriate size to fit the rims and under the fenders' (search is your friend here!) altho since almost all 'normal' car tires are
more than capable of carrying about 3 times the weight of a Spyder at the Kendas' recommended pressures, you really don't want to run a better car tire with stronger sidewalls and a greater ability to keep the majority of the tread on the road - because they're still radial tires, meaning that you still you want the sidewall to flex, but
NOT 'roll under' or let the vehicle ride on the sidewalls, but not so much flexing that it lets the centre of the tread 'throw out' like the lightly constructed Kendas etc do, you only need about 18 psi all round in 'proper' car tires, and despite searching, I haven't found anyone &/or any overloaded Spyder yet that
needs more pressure than that, except maybe if they're being run in 100°+ ambient temps fully loaded for hours at a time, when 20 psi will help minimise the chance of overheating them!
There's quite a few tires in similar nominal sizes with rolling diameters that are very close if not the same as the Kendas which fit the bill, many of them discussed here on the Forum at length. So all you need to do is choose a tire that suits your riding needs/wants, either from those discussed on the Forum already, or if you prefer, any other tire that suits your requirements, then run them at about 18 psi.
