Tires are the single biggest thing separating a Dark Horse that feels incredible from one that feels sketchy, and they're also the first big consumable most of us hit. Here's what came on the car, what to watch, and where owners are landing when it's time to replace.

WHAT YOU'RE ACTUALLY ON

There are two factory setups, and which one you have changes everything about this conversation.

Standard Dark Horse: Pirelli P Zero PZ4, 255/40R19 front and 275/40R19 rear, on 19x9.5 front / 19x10 rear wheels. A serious summer performance tire, but a street tire.

Dark Horse with the Handling Package: Pirelli P Zero Trofeo RS, 305/30R19 front and 315/30R19 rear, on 19x10.5 front / 19x11 rear wheels. The Trofeo RS is a road-legal track tire, developed with this car in mind. It is a different animal — enormously more grip when it's warm, and far more compromise everywhere else.

Not sure which you have? Look at the front tire width. If it says 305 up front, you have the Handling Package tires.

THE 45F RULE — THIS IS THE PART THAT CATCHES PEOPLE

Both of these are summer tires. Neither is a "it's fine, I'll just take it easy" tire when it gets cold.

The industry line, and Pirelli's own, is 45F / 7C. Below that the compound stiffens, grip falls off a cliff, and the rubber can develop cracks. Pirelli's warranty specifically does not cover compound cracking from use in ambient temperatures below 45F — so if you drive them cold and they crack, that's on you, not the tire.

This matters for storage too, not just driving. A car parked outside through a cold snap is at risk sitting still.

Practical version: if you're keeping the car through winter anywhere that sees sub-45F mornings, you need a second set of wheels and tires, or the car needs to be parked. That's not overcaution, it's the actual manufacturer position, and it's the number one thing new owners in cold states find out the hard way.

Also worth knowing: these are performance tires with limited wet-weather margin, and the Trofeo RS especially is not a standing-water tire. In heavy rain, slow down considerably more than you think you need to.

HOW LONG THEY LAST

Honest answer: it varies enormously, and anyone quoting you one number is guessing.

What owners on the S650 forums report, roughly: the standard PZ4 setup can go well into the 20-30k range with mostly street driving. Trofeo RS is much more variable, with some owners reporting rears getting low well under 20k, and a couple of track weekends taking a bigger bite than a year of commuting. Treat those as anecdotes, not spec.

What actually drives it: how much time you spend at full throttle, how many heat cycles you put in, alignment, and pressures. Track use is in a different category entirely.

WHAT TO CHECK ON YOURS

Tread depth across the full width, not just the middle. On the wide staggered fronts, inner-shoulder wear is the thing to look for — it's an early sign an alignment check is worth it.

The DOT date code on the sidewall. Age matters on performance tires even at low mileage.

Cracking in the tread grooves or sidewall, especially if the car has seen cold. That's a replace, not a monitor.

Pressures when cold, against the door-jamb placard. Performance tires are sensitive to being a few PSI off.

One structural note: the staggered sizes mean you cannot rotate front to rear on either setup. Fronts and rears wear independently, and you'll typically be replacing in pairs.

WHEN IT'S TIME TO REPLACE

The common paths owners describe:

Stay on the OEM tire — most grip, same compromises, and the Trofeo RS is not cheap.

Go to a street-biased max-performance summer tire (the Michelin Pilot Sport 4S comes up constantly in these conversations) — more usable in cold and wet, longer life, gives up dry limit grip. This is the most-mentioned swap for cars that are mostly street-driven.

Run two sets — OEM or a dedicated track tire for events, something more forgiving for the street. If you're doing more than a couple of track days a year, most people end up here eventually.

None of that is a recommendation for your specific car. Fitment, load rating and speed rating all need to match what Ford specifies, and if you're changing sizes or dealing with anything that touches warranty or safety, talk to Ford or your dealer first.

NOW YOUR TURN — this is the part that makes the thread useful

Post three things:

1. Which setup you have (PZ4 or Trofeo RS)

2. Your mileage, and how the tires look

3. If you've already replaced them: at what mileage, with what, and what changed

That's the data nobody can find in one place. Real numbers from real cars beat every "how long do Dark Horse tires last" article on the internet, and the next owner searching for this will thank you.