Road Bike Tire Comparison:
Bontrager R4 320 2016 vs
Continental Grand Prix 2014

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Manufacturer Specifications


Manufacturer Specifications
Brand BontragerContinental
Model R4 320Grand Prix
Year 20162014
Tire Type Tubetype (clincher)Tubetype (clincher)
Supplied By Bought in storeBought in store
Full Review Full ReviewFull Review
New or Used NewNew
Mileage 0 km0 km
Price Range Very HighMed
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Manufacturer Part Number 0100637
EAN
TPI 3203/180
Compound Black Chili
Bead FoldingFolding
ETRTO 25-62225-622
Size Inch 28"28"
Width mm 2525
Specified Weight 230 grams245 grams
Min Air Pressure 90 psi110 psi
Max Air Pressure 140 psi120 psi
Made In ThailandGermany
Available Sizes 25-622 (700x25C)23-622 (700x23C)
25-622 (700x25C)
28-622 (700x28C)
23-571 (650x23C)
28-559 (26x1 1/8)
28-406 (20x1.10)
Image
Bontrager R4 320 2016
Continental Grand Prix 2014
Image
Bontrager R4 320 2016
Continental Grand Prix 2014
Image
Bontrager R4 320 2016
Continental Grand Prix 2014

Size and Weight Measurements


Size and Weight Measurements
Model R4 320Grand Prix
Specified Weight 230 grams245 grams
Measured Weight 226 grams239 grams
System Adjusted Weight 326 grams
(tire + inner tube)
339 grams
(tire + inner tube)
Measured Width 25 mm26 mm
Measured Height 22 mm24 mm
Total Tire Thickness Center 2.2 mmNo Data
Total Tire Thickness Sidewall 0.8 mmNo Data
Unmounted Casing Width No DataNo Data
Unmounted Tread Width No DataNo Data
All size measurements are taken at an air pressure of 100 psi / 6.9 bars on a 17.8 mm inner width rim.

Rolling Resistance Test Results


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Rolling Resistance Test Results
Model R4 320Grand Prix
Inner Tube Conti Race28 (100gr butyl)Conti Race28 (100gr butyl)
Spin Up Video YouTubeNo Video
Rolling Resistance
140 PSI / 9.7 Bar
Not TestedNot Tested
Rolling Resistance
120 PSI / 8.3 Bar
11.5 Watts
CRR: 0.00345
14.0 Watts
CRR: 0.00420
Rolling Resistance
100 PSI / 6.9 Bar
12.2 Watts
CRR: 0.00366
14.5 Watts
CRR: 0.00435
Rolling Resistance
80 PSI / 5.5 Bar
13.9 Watts
CRR: 0.00417
15.9 Watts
CRR: 0.00477
Rolling Resistance
60 PSI / 4.1 Bar
16.4 Watts
CRR: 0.00492
18.5 Watts
CRR: 0.00555
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.

Puncture Resistance Test Results


Puncture Resistance Test Results (higher is better)
Model R4 320Grand Prix
Puncture Resistance Tread 10 Points13 Points
Puncture Resistance Sidewall 4 PointsNot Tested

Conclusion


Conclusion
Model R4 320Grand Prix
Full Review Full ReviewFull Review
Verdict RecommendedRecommended
Rating 4 / 54 / 5
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  • Bontrager R4 320
Performance compared to all other road bike tires
(100% is fastest - lightest - thickest - strongest)


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