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245/40ZR17 Tire Size
Shop 245/40ZR17 tires in stock with confirmed size specs, validated diameter in inches, approved rim width range, and verified vehicle fitment before purchase.
Browse and filter 245/40ZR17 tires from Continental, Pirelli, Hankook and more to quickly find your ideal fit.
All You Need to Know About 245/40ZR17 Tires
245/40ZR17 tires are approximately 24.7 inches tall, 9.6 inches wide, and designed for 17-inch wheels. The size shares the same physical dimensions as 245/40R17, but the ZR designation identifies a high-speed radial performance category commonly used in ultra-high-performance summer and performance all-season tire lines.
Drivers comparing 245/40R17 tires with 245/40ZR17 should understand that the dimensional fitment remains effectively identical. The difference is mainly tied to tire construction, speed capability, and performance intent. Most 245/40ZR17 tires are engineered for higher-speed stability, sharper steering response, and stronger tread support than standard touring-oriented 245/40R17 fitments.
Compared with smaller ZR sizes such as 205/40ZR17, 245/40ZR17 adds significantly more tread width and contact patch area. That changes the tire’s behavior under braking, cornering, hydroplaning resistance, and steering load. The 245/40ZR17 size is frequently used on performance sedans, sports coupes, staggered rear-wheel-drive setups, and aftermarket wheel packages where grip and lateral stability matter more than ride softness.
245/40ZR17 Size Quick Specs
- Wheel diameter: 17 inches
- Approved rim width range: 8.0-9.5 inches
- Measuring rim width: 8.5 inches
- Section width: 245 mm, or approximately 9.6 inches
- Sidewall height: approximately 98 mm, or 3.9 inches
- Overall diameter: approximately 24.7 inches
- Circumference: approximately 77.6 inches
- Typical service descriptions: 91W, 95W XL, 95Y XL, depending on tire model
What Does 245/40ZR17 Mean?
245/40ZR17 breaks down as follows:
- 245 = nominal section width in millimeters
- 40 = aspect ratio; sidewall height equals 40% of section width
- ZR = high-speed radial tire category traditionally associated with speeds above 149 mph
- 17 = wheel diameter in inches
The final speed capability of the 245/40ZR17 size is confirmed by the service description following the size. For example, a 245/40ZR17 95Y XL tire uses a load index 95 and a Y speed rating. Load index 95 corresponds to 1,521 pounds per tire when properly inflated and operated within its rated conditions.
To better understand service descriptions, read: Tire Load Carrying Capacity and Speed Ratings.
Why 245/40ZR17 Is Common on Performance Sedans and Sports Cars
245/40ZR17 is frequently used on vehicles that place higher loads on the tire during cornering and braking. Compared with narrower 225-width or 235-width fitments, a 245-width tread provides a larger contact patch area, which can improve dry-road grip and high-speed stability when paired with the correct wheel width and suspension setup.
The 245/40ZR17 size is commonly associated with:
- rear-wheel-drive sports coupes
- performance-oriented sedans
- staggered wheel setups
- aftermarket fitment upgrades
- track-day and autocross applications
Many 245/40ZR17 tires are sold in ultra-high-performance summer or performance all-season categories rather than basic touring families. Reinforced XL construction is also common because wider performance tires experience greater cornering and heat loads than narrower passenger-oriented sizes.
245/40ZR17 vs 245/40R17: What Actually Changes?
245/40ZR17 and 245/40R17 share the same dimensional geometry. The difference is not overall size, but the type of tire lines where the size is commonly used.
Many standard 245/40R17 listings include touring, grand touring, or less aggressive all-season models. By contrast, 245/40ZR17 is more heavily concentrated in:
- ultra-high-performance summer tires
- performance all-season tires
- track-capable street tires
- reinforced XL constructions
- higher-speed-rated fitments
That does not mean every 245/40ZR17 tire is a track tire. However, the ZR designation is more strongly associated with performance-focused tire families than standard 245/40R17 replacement categories.
Drivers comparing passenger-designated fitments should also review P245/40ZR17 tires, where the P-metric classification is identified directly in the size marking.
Recommended 245/40ZR17 Tires
- Pirelli PZero System (Asimmetrico/Direzionale)
- Continental ExtremeContact DWS06 Plus
- Hankook Ventus V12 Evo2 K120
- Nexen N'Fera SU1
- Falken Azenis FK460 A/S
- General G-Max AS-07
How Wheel Width Affects 245/40ZR17 Tire Shape
Wheel width plays a major role in how 245/40ZR17 performs because the tire is relatively wide while still using a short 40-series sidewall.
The 45/40ZR17 size is commonly approved for wheels between 8.0 and 9.5 inches wide, with many specifications measured on an 8.5-inch wheel.
On narrower wheels near the minimum approved range:
- the sidewall becomes more rounded
- steering response may feel softer
- impact absorption may increase slightly
- tread shoulders may flex more during cornering
On wider wheels near the upper approved range:
- the sidewall becomes straighter
- steering response usually sharpens
- tread stability improves during aggressive driving
- ride harshness and wheel exposure can increase
Because 245/40ZR17 has only about 3.9 inches of sidewall height, even moderate wheel-width changes are more noticeable than they would be on taller 50-series or 60-series tires.
For more on approved wheel widths and fitment limits, read: What Rim Width Fits Your Tire.
245/40ZR17 Tire Models Commonly Compared
245/40ZR17 is widely available in performance-oriented tire families. Depending on season and inventory, drivers commonly compare:
- Continental ExtremeContact models
- Bridgestone Potenza models
- Pirelli P Zero models
- Falken Azenis models
- Yokohama ADVAN models
Drivers prioritizing daily comfort usually compare wet traction, road noise, and tread life. Drivers focused on aggressive handling often prioritize steering precision, heat resistance, shoulder stiffness, and dry-road grip.
Choosing Wheels for 245/40ZR17 Tires
Because 245/40ZR17 is both wide and relatively low-profile, wheel fitment accuracy matters more than it does on taller touring sizes.
Before replacing wheels compatible with 245/40ZR17 tires, confirm:
- wheel width
- wheel offset
- bolt pattern
- center bore
- brake clearance
- suspension clearance
- wheel load rating
- fender clearance during suspension compression
Browse compatible wheel options here: NeoTires Wheels & Rims.
For deeper wheel setup guidance, read: Aftermarket Wheel Fitment: 7 Specs You Can't Get Wrong.
All You Need to Know About 245/40ZR17 Tires
245/40ZR17 tires are approximately 24.7 inches tall, 9.6 inches wide, and designed for 17-inch wheels. The size shares the same physical dimensions as 245/40R17, but the ZR designation identifies a high-speed radial performance category commonly used in ultra-high-performance summer and performance all-season tire lines.
Drivers comparing 245/40R17 tires with 245/40ZR17 should understand that the dimensional fitment remains effectively identical. The difference is mainly tied to tire construction, speed capability, and performance intent. Most 245/40ZR17 tires are engineered for higher-speed stability, sharper steering response, and stronger tread support than standard touring-oriented 245/40R17 fitments.
Compared with smaller ZR sizes such as 205/40ZR17, 245/40ZR17 adds significantly more tread width and contact patch area. That changes the tire’s behavior under braking, cornering, hydroplaning resistance, and steering load. The 245/40ZR17 size is frequently used on performance sedans, sports coupes, staggered rear-wheel-drive setups, and aftermarket wheel packages where grip and lateral stability matter more than ride softness.
245/40ZR17 Size Quick Specs
- Wheel diameter: 17 inches
- Approved rim width range: 8.0-9.5 inches
- Measuring rim width: 8.5 inches
- Section width: 245 mm, or approximately 9.6 inches
- Sidewall height: approximately 98 mm, or 3.9 inches
- Overall diameter: approximately 24.7 inches
- Circumference: approximately 77.6 inches
- Typical service descriptions: 91W, 95W XL, 95Y XL, depending on tire model
What Does 245/40ZR17 Mean?
245/40ZR17 breaks down as follows:
- 245 = nominal section width in millimeters
- 40 = aspect ratio; sidewall height equals 40% of section width
- ZR = high-speed radial tire category traditionally associated with speeds above 149 mph
- 17 = wheel diameter in inches
The final speed capability of the 245/40ZR17 size is confirmed by the service description following the size. For example, a 245/40ZR17 95Y XL tire uses a load index 95 and a Y speed rating. Load index 95 corresponds to 1,521 pounds per tire when properly inflated and operated within its rated conditions.
To better understand service descriptions, read: Tire Load Carrying Capacity and Speed Ratings.
Why 245/40ZR17 Is Common on Performance Sedans and Sports Cars
245/40ZR17 is frequently used on vehicles that place higher loads on the tire during cornering and braking. Compared with narrower 225-width or 235-width fitments, a 245-width tread provides a larger contact patch area, which can improve dry-road grip and high-speed stability when paired with the correct wheel width and suspension setup.
The 245/40ZR17 size is commonly associated with:
- rear-wheel-drive sports coupes
- performance-oriented sedans
- staggered wheel setups
- aftermarket fitment upgrades
- track-day and autocross applications
Many 245/40ZR17 tires are sold in ultra-high-performance summer or performance all-season categories rather than basic touring families. Reinforced XL construction is also common because wider performance tires experience greater cornering and heat loads than narrower passenger-oriented sizes.
245/40ZR17 vs 245/40R17: What Actually Changes?
245/40ZR17 and 245/40R17 share the same dimensional geometry. The difference is not overall size, but the type of tire lines where the size is commonly used.
Many standard 245/40R17 listings include touring, grand touring, or less aggressive all-season models. By contrast, 245/40ZR17 is more heavily concentrated in:
- ultra-high-performance summer tires
- performance all-season tires
- track-capable street tires
- reinforced XL constructions
- higher-speed-rated fitments
That does not mean every 245/40ZR17 tire is a track tire. However, the ZR designation is more strongly associated with performance-focused tire families than standard 245/40R17 replacement categories.
Drivers comparing passenger-designated fitments should also review P245/40ZR17 tires, where the P-metric classification is identified directly in the size marking.
Recommended 245/40ZR17 Tires
- Pirelli PZero System (Asimmetrico/Direzionale)
- Continental ExtremeContact DWS06 Plus
- Hankook Ventus V12 Evo2 K120
- Nexen N'Fera SU1
- Falken Azenis FK460 A/S
- General G-Max AS-07
How Wheel Width Affects 245/40ZR17 Tire Shape
Wheel width plays a major role in how 245/40ZR17 performs because the tire is relatively wide while still using a short 40-series sidewall.
The 45/40ZR17 size is commonly approved for wheels between 8.0 and 9.5 inches wide, with many specifications measured on an 8.5-inch wheel.
On narrower wheels near the minimum approved range:
- the sidewall becomes more rounded
- steering response may feel softer
- impact absorption may increase slightly
- tread shoulders may flex more during cornering
On wider wheels near the upper approved range:
- the sidewall becomes straighter
- steering response usually sharpens
- tread stability improves during aggressive driving
- ride harshness and wheel exposure can increase
Because 245/40ZR17 has only about 3.9 inches of sidewall height, even moderate wheel-width changes are more noticeable than they would be on taller 50-series or 60-series tires.
For more on approved wheel widths and fitment limits, read: What Rim Width Fits Your Tire.
245/40ZR17 Tire Models Commonly Compared
245/40ZR17 is widely available in performance-oriented tire families. Depending on season and inventory, drivers commonly compare:
- Continental ExtremeContact models
- Bridgestone Potenza models
- Pirelli P Zero models
- Falken Azenis models
- Yokohama ADVAN models
Drivers prioritizing daily comfort usually compare wet traction, road noise, and tread life. Drivers focused on aggressive handling often prioritize steering precision, heat resistance, shoulder stiffness, and dry-road grip.
Choosing Wheels for 245/40ZR17 Tires
Because 245/40ZR17 is both wide and relatively low-profile, wheel fitment accuracy matters more than it does on taller touring sizes.
Before replacing wheels compatible with 245/40ZR17 tires, confirm:
- wheel width
- wheel offset
- bolt pattern
- center bore
- brake clearance
- suspension clearance
- wheel load rating
- fender clearance during suspension compression
Browse compatible wheel options here: NeoTires Wheels & Rims.
For deeper wheel setup guidance, read: Aftermarket Wheel Fitment: 7 Specs You Can't Get Wrong.
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