245/40 R21 Tyres in Park Royal
245 mm wide, 40% profile, for a 21-inch wheel. Fitted at our NW10 workshop, with live prices online.
245/40 R21 is a 21-inch tyre, 245 mm wide, with a sidewall 98 mm tall (40% of the width). We fit 245/40 R21 tyres at our Park Royal garage in NW10, with balancing, a new valve and disposal of the old tyre included. The price depends on the brand: see live prices for 245/40 R21. It is fitted to cars such as the BMW X3, Porsche Taycan and Volvo XC40.
What 245/40 R21 means
- 245: the tyre is 245 mm wide, measured across the sidewalls.
- 40: the sidewall height is 40% of the width, so 245 × 40% = 98 mm.
- R: radial construction. A ZR in the same place is the same size with a speed marking for over 240 km/h.
- 21: it fits a 21-inch wheel. Overall diameter is 21 × 25.4 mm plus two sidewalls: 729.4 mm.
The load index and speed rating follow the size on the sidewall (for example 91V). Replace like for like or higher, as your handbook states.
Cars that use 245/40 R21
Manufacturer and tyre-maker fitment listings give 245/40 R21 for these models, usually as one of several wheel options. The size on your own tyres, or on the placard in the door frame, is the one to match.
| Make | Model | Generation |
|---|---|---|
| BMW | X3 | G01 (2017-2024, including 2021 facelift) |
| Porsche | Taycan | Y1A facelift (2024-) |
| Volvo | V90 Cross Country | 2016- (incl. 2020 facelift) |
| Volvo | XC40 | Mk1 (2017-), petrol, diesel, mild hybrid and plug-in hybrid |
What to look for in a 245/40 R21 tyre
- Low profile, less cushion. A 98 mm sidewall on a 21-inch wheel leaves little to absorb a pothole or a kerb, so check for bulges and rim damage after a hard hit, and have the wheel alignment checked if the steering pulls or the new tyres wear on one edge.
- Check the load index. Many of the SUVs, crossovers and vans on this size are heavy, and some are fitted with reinforced (XL) tyres. Match or beat the load index on the tyres you are replacing.
- Winter or all-season. If you want winter or all-season tyres in 245/40 R21, the live list shows what is made in this size today; not every pattern is made in every size.
245/40 R21 tyres by price band
These are the brands we fit, by price band. Which of them make 245/40 R21, and at what price today, is on the live price list.
- Premium: Continental, Pirelli, Hankook, Yokohama, Bridgestone, Dunlop, Goodyear, Michelin
- Mid-range: Avon, Nankang, Roadstone, Kumho
- Budget: Accelera, Linglong
Prices for 245/40 R21 depend on the brand — see live fitted prices for 245/40 R21.
Book online, call 020 3886 2355 or WhatsApp 07476 586 589. We fit at Unit 4 Unimix House, Abbey Road, Park Royal, London, NW10 7TR, balancing and a new valve included.
Sizes next to 245/40 R21
Same 21-inch rim, one step wider, narrower, taller or lower.
Sizes with a similar overall diameter
These sizes are within 3% of the 729.4 mm diameter of 245/40 R21 on paper, and within 20 mm of its width. That alone does not make them approved for your car: check the handbook or the door placard, and keep one size across an axle.
| Size | Overall diameter | Difference |
|---|---|---|
| 245/45 R20 | 728.5 mm | -0.1% |
| 235/45 R20 | 719.5 mm | -1.4% |
| 265/35 R21 | 718.9 mm | -1.4% |
| 235/50 R20 | 743 mm | +1.9% |
| 265/35 R22 | 744.3 mm | +2.0% |
| 235/45 R21 | 744.9 mm | +2.1% |
See all tyre sizes, or read how our tyre fitting works.
Frequently asked questions
Is 245/40 R21 the same as 245/40 ZR21?
Yes, the dimensions are the same. The Z marks a tyre rated for over 240 km/h (149 mph); the exact rating is the letter after the load index, such as W or Y. Fit at least the speed rating your handbook gives for the car.
Can I fit 245/45 R20 instead of 245/40 R21?
Only if 245/45 R20 is listed for your car. On paper it is 728.5 mm tall against 729.4 mm for 245/40 R21, a 0.1% difference, so the speedometer would barely change. It also needs a 20-inch wheel instead of a 21-inch one. Wheel width, arch clearance, load index and speed rating must suit the car too, so check the handbook or the door placard, and fit one size across an axle.
How tall is a 245/40 R21 tyre?
About 729.4 mm (28.7 inches) across when new and unloaded: the 21-inch rim (533.4 mm) plus two sidewalls of 98 mm, which is 40% of the 245 mm width. Real tyres differ by a few millimetres between brands and patterns.
Which cars use 245/40 R21 tyres?
Fitment listings give 245/40 R21 for the BMW X3, Porsche Taycan, Volvo XC40 and Volvo V90 Cross Country. One model can use several sizes depending on its wheels, so check the sidewall of your own tyres before you book.
Same-Day Tyre Fitting & Walk-Ins Welcome
New tyres fitted while you wait, plus puncture repairs, wheel balancing and battery replacement at our Park Royal workshop. No appointment needed for tyres, just call in.