Road Bike Tire Comparison:
Bontrager R4 320 25 2016 vs
Pirelli P Zero Velo 25 2017
Contents and Test Summary
- Manufacturer Specifications
- Size and Weight Measurements
- Rolling Resistance Test Results
- Puncture Resistance Test Results
- Static Grip Test Results
- Conclusion
- Bontrager R4 320 25 *
- Pirelli P Zero Velo 25 *
* Grip test data not available
Performance compared to all other road bike tires
(100% is best)
(100% is best)
Pro Members get 11-point radar charts
Manufacturer Specifications
| Manufacturer Specifications | ||
|---|---|---|
| Brand | Bontrager | Pirelli |
| Model | R4 320 25 | P Zero Velo 25 |
| Year | 2016 | 2017 |
| Tire Type | Tubetype (clincher) | Tubetype (clincher) |
| Supplied By | Bought in store | Bought in store |
| Full Review | Full Review | Full Review |
| New or Used | New | New |
| Mileage | 0 km | 0 km |
| Price Range | Very High | High |
| Buy At | Ad Amazon.com | |
| Manufacturer Part Number | ||
| EAN | ||
| TPI | 320 | 127 |
| Compound | SmartNET Silica | |
| Bead | Folding | Folding |
| ETRTO | 25-622 | 25-622 |
| Size Inch | 28" | 28" |
| Width mm | 25 | 25 |
| Specified Weight | 230 grams | 210 grams |
| Min Air Pressure | 90 psi | psi |
| Max Air Pressure | 140 psi | 110 psi |
| Made In | Members Only | Members Only |
| Available Sizes | 25-622 (700x25C) | 23-622 (700x23C) 25-622 (700x25C) 28-622 (700x28C) |
| Image 1 |  |  |
| Image 2 |  |  |
| Image 3 |  |  |
| Image 4 | Not Available | Not Available |
Size and Weight Measurements
| Size and Weight Measurements | ||
|---|---|---|
| Model | R4 320 25 | P Zero Velo 25 |
| Specified Weight | 230 grams | 210 grams |
| Measured Weight | 226 grams | 210 grams |
| System Adjusted Weight | 326 grams (tire + inner tube) | 310 grams (tire + inner tube) |
| Measured Width | 25 mm (un-round) | 27 mm (un-round) |
| Measured Height | 22 mm (un-round) | 25 mm (un-round) |
| Total Tire Thickness Center | 2.2 mm | 2.6 mm |
| Total Tire Thickness Sidewall | Members Only | Members Only |
| Unmounted Casing Width | No Data | No Data |
| Unmounted Tread Width | No Data | No Data |
| Tread Cover (Tread / Casing Ratio) | No Data | 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. | ||
Rolling Resistance Test Results
| Rolling Resistance Test Results | ||
|---|---|---|
| Model | R4 320 25 | P Zero Velo 25 |
| Spin Up Video | YouTube | YouTube |
| Inner Tube | Conti Race28 (100gr butyl) | Conti Race28 (100gr butyl) |
| Measured Width | ||
| Rolling Resistance Real tire width in mm: 22-24 = 132 psi/9.1 bar 25-27 = 120 psi/8.3 bar 28-29 = 108 psi/7.4 barUltra High Air Pressure |
11.5 Watts CRR: 0.00345 (120 psi / 8.3 bar) | 12.5 Watts CRR: 0.00375 (120 psi / 8.3 bar) |
| Rolling Resistance Real tire width in mm: 22-24 = 110 psi/7.6bar 25-27 = 100 psi/6.9 bar 28-29 = 90 psi/6.2 barExtra High Air Pressure |
12.2 Watts CRR: 0.00366 (100 psi / 6.9 bar) | 13.2 Watts CRR: 0.00396 (100 psi / 6.9 bar) |
| Rolling Resistance Real tire width in mm: 22-24 = 88 psi/6.1 bar 25-27 = 80 psi/5.5 bar 28-29 = 72 psi/5.0 barHigh Air Pressure |
Members Only | Members Only |
| Rolling Resistance Real tire width in mm: 22-24 = 66 psi/4.6 bar 25-27 = 60 psi/4.1 bar 28-29 = 54 psi/3.7 barMedium Air Pressure |
Members Only | Members Only |
| The Road Bike section is a multi tire size section, air pressures have been adjusted to the measured casing width. 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 320 25 | P Zero Velo 25 |
| Total Puncture Score Tread | 44 Points | 54 Points |
| Total Puncture Score Sidewall | Members Only | Members Only |
| Tread Puncture Force Sharp Needle | Members Only | Members Only |
| Tread Puncture Force Blunt Needle | Members Only | Members Only |
| Tread Total Tire Thickness | 2.2 mm | 2.6 mm |
| Sidewall Puncture Force Sharp Needle | Members Only | Members Only |
| Sidewall Puncture Force Blunt Needle | Members Only | Members Only |
| Sidewall Total Tire Thickness | Members Only | Members Only |
Static Grip Test Results
| Static Grip Test Results (higher is better) | ||
|---|---|---|
| Model | R4 320 25 | P Zero Velo 25 |
| Wet Grip Average | No Data | No Data |
| Wet Grip Center | Members Only | Members Only |
| Wet Grip Edge | Members Only | Members Only |
| Grip in points = coefficient of friction * 100 | ||
Conclusion
| Conclusion | ||
|---|---|---|
| Model | R4 320 25 | P Zero Velo 25 |
| Full Review | Full Review | Full Review |
| Verdict | Recommended | Highly Recommended |
| Rating | 4.0 / 5 | 5.0 / 5 |
| Buy At | Ad Amazon.com | |
- Bontrager R4 320 25 *
- Pirelli P Zero Velo 25 *
* Grip test data not available
Performance compared to all other road bike tires(100% is best)
Pro Members get 11-point radar charts