Road Bike Tire Test: Continental Grand Prix

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

The Continental Grand Prix 700 x 25C is a medium priced road bike tire. It's handmade in Germany, has a 3/180 TPI carcass, PolyX puncture protection, and the Continental Black Chili compound for reduced rolling resistance, more grip, and higher mileage. You get quite a lot for your money with this tire. The Grand Prix is pretty much a cheaper version of the Grand Prix 4000S II tire from Continental. Continental specifies the Grand Prix as a Tour / Race tire while the Grand Prix 4000S II gets specified as a Tour / Race / Time Trial tire.


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I choose to test this tire because I wanted to know how a cheaper choice in a manufacturers tire line-up compares to the top of the line product. While most other manufacturers top of the range tires are manufactured in low-labor-cost countries, it's a surprise the packaging says this medium priced Continental is handmade in Germany.

Manufacturer Specifications


Manufacturer Specifications
Brand Continental
Model Grand Prix
Year 2014
Tire Type Tubetype (clincher)
Supplied By Bought in store
New or Used New
Mileage 0 km
Price Range Med
Buy At Ad Amazon.com
Manufacturer part number 0100637
TPI 3/180
Compound Black Chili
Bead Folding
ETRTO 25-622
Size Inch 28"
Width 25
Specified Weight 245 grams
Max Pressure 120
Made In Members Only
Available Sizes 23-622 (700x23C)
25-622 (700x25C)
28-622 (700x28C)
23-571 (650x23C)
28-559 (26x1 1/8)
28-406 (20x1.10)

Continental Grand Prix Test Results

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

Size, Weight, and Thickness Measurements


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Size, Weight and Thickness Measurements
Specified Weight 245 grams
Measured Weight 239 grams
System Adjusted Weight
(tire + inner tube (100 gr)
339 grams
Measured Width 26 mm (un-round)
Measured Height 24 mm (un-round)
Total Tire Thickness Center No Data
Total Tire Thickness Sidewall Members Only
Unmounted Casing Width No Data
Unmounted Tread Width No Data
All size measurements are taken at an air pressure of 100 psi / 6.9 bars on a 17.8 mm inner width rim.

The measured weight of the Continental Grand Prix is a bit higher than more expensive tires but with a weight of 239 grams, comes in lower than the specified weight of 245 grams. This tire is close to a true 25C tire with a width of 26 mm and a height of 24 mm on a 17C rim.

Rolling Resistance Test Results


Rolling Resistance Test Results
Inner Tube Conti Race28 (100gr butyl)
Rolling Resistance
140 PSI / 9.7 Bar
Not Tested
Rolling Resistance
120 PSI / 8.3 Bar
14.0 Watts
CRR: 0.00420
Rolling Resistance
100 PSI / 6.9 Bar
14.5 Watts
CRR: 0.00435
Rolling Resistance
80 PSI / 5.5 Bar
Members Only
Rolling Resistance
60 PSI / 4.1 Bar
Members Only
All numbers are for a single tire at a speed of 29 km/h / 18 mph and a load of 42.5 kg / 94 lbs.

Use the formula: RR (Watts) = CRR * speed (m/s) * load (N) to calculate rolling resistance at a given speed and load.

Performance is excellent for a tire in this price range. Rolling resistance is a bit higher when compared to the top of the line road bike tires. At an air pressure of 120 psi, rolling resistance is 14.0 watts. 14.0 watts is 1.8 watts higher than the more expensive Continental GP4000S II which came in at 12.2 watts. At an air pressure of 100 psi, rolling resistance is excellent at 14.5 watts. Dropping air pressure to 80 psi results in 15.9 watts of rolling resistance.

Puncture Resistance Test Results

Continental Grand Prix road bike tire on a rolling resistance test machine
Puncture Resistance Test Results (higher is better)
Puncture Resistance Tread 13 Points
Puncture Resistance Sidewall Members Only

While rolling resistance is a bit worse than more expensive tires, puncture resistance is a bit better. With a score of 13, it outperforms the GP4000S II by 2 points in the puncture resistance test.

Conclusion


With a rise in rolling resistance of only 0.5 watts, the Continental Grand Prix performs very well at 100 psi / 6.9 bars. At 80 psi / 5.5 bar performance is still good but compared to more expensive tires the differences start to become bigger. It seems performance of cheaper tires is still decent, and the difference is much smaller than I expected it would be. When you're just touring for fun, you probably won't notice the difference.


For the price of a single Grand Prix 4000S II, you can almost buy a pair of Grand Prix. Rolling resistance will be 4 to 7 watts higher for a pair of tires when making a correction for an average road bike speed of 23 mph / 36 km/h. You also have to carry 40-50 grams extra weight, but you'll gain 18% in puncture resistance. What you also get is the same Black Chili compound, which I know has excellent grip and little wear.

Ad Buy Continental Grand Prix at Amazon.com


RATING: 4.0 / 5
TEST VERDICT:
Recommended


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