265/40R18 tires
Prices, best picks and current deals for 265/40R18, a performance cars size fitted to Porsche 911, Porsche Boxster/Cayman and more.
What 265/40R18 tires cost
Nitto NT555 G2
Lowest price that still brakes and wears acceptably. Fine for a second car or low annual mileage.
Bridgestone Potenza Sport
The value sweet spot: long mileage warranty, solid wet grip, sane price.
Michelin Pilot Sport 4S
Best wet and snow braking, quietest ride, longest tread life. Worth it if you keep the car.
Prices are per tire, before mounting and balancing, based on what the big US online retailers charge for this size. A set of four in the mid range comes to roughly $720 to $960, and a brand rebate can take another $50 to $110 off, see this month's deals.
About the 265/40R18 size
Classic Porsche rear size on 18 in wheels. Fit it as a matched pair with the 235/40R18 fronts - Porsche N-spec versions cost more but keep the handling balance the car was set up for.
The numbers mean: 265 mm section width, sidewall height 40 % of that width, and a 18-inch rim. Overall diameter works out to about 26.3 inches. Any replacement has to match all three, and the load index and speed rating on your door sticker must be met or exceeded. Our guide on reading a tire size walks through it.
Vehicles that use 265/40R18
- Porsche 911 (2005-2011, 997 rear)
- Porsche Boxster/Cayman (2005-2012, 987 18 in rear)
Confirm on the door-jamb sticker before ordering. Optional wheel packages often change the size within the same model.
Which type of 265/40R18 tire?
All-Season Tires
Drivers in the South, West Coast and mild parts of the Midwest who want one set of tires that lasts a long time and is quiet.
Summer Tires
Sports-car and performance-sedan owners, and anyone in a warm climate who wants the best possible grip and steering.
Performance Tires
Owners of sports sedans, hot hatches and performance crossovers who want year-round tires with real handling.
Frequently asked questions
How much do 265/40R18 tires cost?
Expect $135–$175 per tire for a budget brand, $180–$240 for a mid-range tire like the Bridgestone Potenza Sport, and $250–$330 for a premium tire like the Michelin Pilot Sport 4S. Add roughly $15 to $45 per tire for mounting and balancing.
What vehicles use 265/40R18 tires?
265/40R18 is original equipment on Porsche 911 (2005-2011, 997 rear), Porsche Boxster/Cayman (2005-2012, 987 18 in rear), among others. Always confirm with the sticker inside your driver's door, because trim levels and wheel packages can change the size.
What is the best 265/40R18 tire?
For most drivers our mid-range pick, the Bridgestone Potenza Sport, is the sweet spot of price and tread life. If you keep the vehicle a long time or drive in heavy rain and snow, the Michelin Pilot Sport 4S is worth the extra. On a tight budget the Nitto NT555 G2 is a sound choice.
Can I replace just one or two 265/40R18 tires?
On a front- or rear-wheel-drive car, yes: replace in pairs on the same axle and put the newer pair on the rear. On all-wheel-drive vehicles most makers want all four replaced together, or a new tire shaved to match, because a difference in circumference strains the drivetrain.