Tire Test - Continental Grand Prix 4000S II

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Test Summary

Conclusion: 5 / 5 Highly Recommended
Weight: 215 grams
Rolling Resistance: 12.2 watts
Puncture Resistance: 11 / 5


Continental Grand Prix 4000S II road bike tire on a rolling resistance test machine

The Continental Grand Prix 4000S II 700 x 25C, also known as the "GP4000S II", is the best clincher road bike tire in the Tour / Race class Continental has to offer. The GP4000S II is a facelift of the original GP4000S, which already was a popular road bike tire. It has the Black Chili compound for reduced rolling resistance, more grip, and higher mileage. A patented Vectran Breaker layer under the tread gives it the highest possible puncture protection at the lowest weight.


Buy Continental Grand Prix 4000S II at Amazon.com


Because this is one of the most popular road bike tires of the moment, it was at the top of my list of tires to test. I already knew it has a finely tuned balance between rolling resistance, puncture resistance, grip, and durability. This will make it an excellent baseline to compare rolling resistance and puncture resistance with other road bike tires. (view all reviews)


The Grand Prix 4000S II used for this test has a weight of 215 grams, which is 10 grams lighter than the claimed weight of 225 grams. The lower weight should be an advantage in the rolling resistance test because less rubber means less rolling resistance. I must say that every Continental tire I've had on the scale weighed less than the specified weight. +1 for Conti.


Manufacturer Specifications
Brand Continental
Model Grand Prix 4000S II
Year 2014
Tire Type Tubetype (clincher)
Supplied By Bought in store
New or Used New
Mileage 0 km
Price Range High
Price Amazon.com
Part number 0100945
TPI 3/330
Compound Black Chili
Bead Folding
ETRTO 25-622
Size Inch 28"
Width 25
Specified Weight 225 grams
Max Pressure 120
Made In Germany
Available Sizes 20-622 (700x20C)
23-622 (700x23C)
25-622 (700x25C)
28-622 (700x28C)
23-571 (650x23C)

Test Results



Size and Weight Measurements


Continental Grand Prix 4000S II road bike tire on a rolling resistance test machine
Size and Weight Measurements (Bike Wheel: 622x17C, Pressure: 100 psi / 6.9 bar)
Specified Weight 225 grams
Measured Weight 215 grams
Measured Width 27 mm
Measured Height 25 mm
Total Tire Thickness Center 2.9 mm
Total Tire Thickness Sidewall 0.55 mm

As noted previously, the measured weight is 215 grams which is less than the 225 grams specified by Continental. The Grand Prix 4000S II is also quite a big tire with a width of 27 mm and a height of 25 mm on a 17C rim. All in all, not bad for a tire with a weight of 215 grams.




Rolling Resistance Test Results


Rolling Resistance Test Results (Speed: 29 kmh / 18 mph / 8 m/s, Load: 42.5 kg / 417 N)
Inner Tube Conti Race28 (100gr butyl)
Rolling Resistance 140 psi / 9.7 Bar Not Tested
CRR: Not Tested
Rolling Resistance 120 psi / 8.3 Bar 12.2 Watts
CRR: 0.00366
Rolling Resistance 100 PSI / 6.9 Bar 12.9 Watts
CRR: 0.00387
Rolling Resistance 80 PSI / 5.5 Bar 13.7 Watts
CRR: 0.00411
Rolling Resistance 60 PSI / 4.1 Bar 15.5 Watts
CRR: 0.00465
Use the formula: RR (watts) = CRR * speed (m/s) * load (N) to calculate rolling resistance at a given speed and load

Performance in the rolling resistance test is great. At an air pressure of 120 psi, rolling resistance is a low 12.2 watts, which is excellent for a Tour / Race type tire. Dropping air pressure to 100 psi results in a rolling resistance of 12.9 watts. Lowering air pressure even lower results in a rolling resistance of 13.7 watts at an air pressure of 80 psi.


Noteworthy is the very flat rolling resistance graph of this tire, dropping air pressure to 80 psi increases rolling resistance by only 1.5 watts per tire. This is a great feature because rider comfort will increase greatly at 80 / 90 psi at a very low cost.




Puncture Resistance Test Results


Puncture Resistance Test Results (higher is better)
Puncture Resistance Tread 11
Puncture Resistance Sidewall 5

With a puncture resistance score of 11, performance in the puncture resistance test is slightly below average. Most other tires in the same class seem to score just a little bit higher in this test. In my opinion and taking into consideration the very flat rolling resistance response, this is a good trade-off because I like fast tires. If you happen to hate flats, you might be better off picking a different tire.


While the tread puncture resistance score is slightly below average, the sidewall puncture resistance score of 5 points is slightly better than most other comparable tires. The Schwalbe One V-Guard (review) is a tire which comes very close to the Grand Prix 4000S II in the rolling resistance test. The Schwalbe One has a better tread puncture score (12), but a lower sidewall score (4).




Conclusion


Continental Grand Prix 4000S II road bike tire on a rolling resistance test machine

After putting the Grand Prix 4000S II through all of our tests, I totally understand why this is such a popular tire. This tire can be run at an air pressure of 80 psi / 5.5 bars at the cost of just 1.5 watts (Crr: 0.0004) of rolling resistance per tire. This is a very slight drop-off and shows the quality of this tire. At 60 psi / 4.1 bars, performance is still excellent as well. It scores 11 points in the puncture resistance test which is lower than average but should be adequate.


If you want fast tires that still offer some puncture protection and are willing to pay for it, the Continental Grand Prix 4000S II is a great choice. From personal experience, I know wear and wet grip of the Black Chili Compound is great as well. I would buy a pair of these if I were in the market for some road bike tires.


Buy Continental Grand Prix 4000S II at Amazon.com


RATING: 5 / 5
TEST VERDICT:
Highly Recommended


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