Blacklightning, I'd be surprised if you need anything near 25 psi in those tires on the front of your Spyder, possibly 20 psi but very likely even a little lower would be much safer! Check the Max Load/Max Pressure info on the sidewall, & work out what fraction of that max load your Spyder actually puts on the front tires, then apply the same fraction to the max pressure listed to get a guide 'start pressure'; or better yet, find the manufacturers published tire load/pressure info, it should be available somewhere & tell you what pressure those tires need to carry the load on them from the Spyder - but I'm pretty positive that the pair of tires up front won't need anywhere like 25psi in them to do the job at their best! And it seems most are running somewhat less too!!
The risks of running too high a pressure in any tire includes a greater tendency towards road damage & punctures etc, but more importantly, tires that are running too high a pressure will never get to their optimal temperature so the compound always remains 'cold & hard' rather than getting 'warm & sticky', which means they can't grip the road as well as they should - and of course the tire will balloon so that you are only touching the road surface with a tiny strip of tread down the middle, which will wear that bit out quickly but also stop the tire from being able to use the tread pattern to 'pump out' any water or even air that gets between the rubber & the road, reducing grip even more!! And the sidewalls of car tires are going to be more heavily constructed to start with, then pumping them up high enough to carry 1000lbs instead of 400lbs is gonna make them ride like steel rings instead of absorbing some of the road shock!! And the 'too hard' tires will also tend to bounce over minor imperfections in the road too, actually letting them leave the road momentarily & lessening the grip from the tires even more!! If your tire pressure isn't increasing by about 4psi after riding for an hour, the tires are simply not warming up properly & are never going to be working for you in the way pneumatic tires are meant to!!
25 psi in a passenger construction tire of that size running under something as light as our Spyders is likely to be WAAAAAY TOO HIGH!! :yikes: