It never caused any fault lights to flash and speedo error is within range. You can't get too focused on that. If interested, read what I have to say about that below
Ok, what size tire can you run and keep the speedometer accurate? Who's saying it's accurate now? When is it accurate? Basic math leads to the following explanation.
Let's say you have the factory rear tire on your slingshot and it comes from the factory with 9/32" of tread. Ok so far? So you wear it down to the tread bars which show up at 2/32" remaining tread. So how much tread have you worn off the tire? If you said 7/32" you're only partially correct. Your speedometer is calibrated by the effective gear ratio as well as the overall tire height. So when your tire is worn out and at the 2/32" remaining tread, and you put it side by side by the identical new tire, the difference in height is 14/32" (or almost 1/2" difference). So your speedometer on your slingshot is accurate sometime during the life of your tire. Replacing it with something close, makes it also accurate, but at a different point in time. A taller tire will be accurate when it wears down some, a shorter tire is more accurate when it's new. Just food for thought. I always run with my GPS on and it displays current speeds and the difference from that and the speedometer varies from identical to a mile or two off depending on speed. It's one of those factors to consider when buying the tire, but as long as you're close, don't worry too much about it. Two miles per hour off isn;t going to save you from that speeding ticket. Ask Kenny_H about how that works out in GA