Road Bike Tire Test: Vittoria Open Corsa CX III Latex Tube 25

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Vittoria Open Corsa CX III Latex Tube 25 road bike tire on a rolling resistance test machine

This is part two of a latex vs butyl road bike inner tube comparison. I'm going to use last week's review of the Continental Grand Prix 4000S II with a latex tube Read Here as a template and won't add much to this review except the data. This time I'm using the Vittoria Open Corsa CX III reviewed Here. Just like last weeks review I've substituted the standard 100 grams Continental butyl inner tube for a 80 grams Michelin AirComp A1 Latex tube. I've chosen the GP4000S II and Open Corsa CX III to test a latex inner tube simply because these are the fastest road bike tires I had the chance to test up to now.


If you're purely interested in the differences between butyl and latex tubes, I highly recommend you to also read this special article which includes latex,butyl and light butyl tubes.


Inner Tubes Specifications


Butyl Inner Tube


  • Brand: Continental
  • Model: Race 28, 18-25 x 622
  • Weight: 100 grams

Latex Inner Tube


  • Brand: Michelin
  • Model: AirComp A1 Latex
  • Weight: 80 grams

Manufacturer Specifications


Manufacturer Specifications
Brand Vittoria
Model Open Corsa CX III Latex Tube
Year 2014
Tire Type Tubetype (clincher)
Supplied By Bought in store
New or Used New
Mileage 0 km
Price Range High
Buy At
Manufacturer part number 111.391.SC.111.BX
TPI 320
Compound ISOgrip Compound
Bead Folding
ETRTO 25-622
Size Inch 28"
Specified Width (mm) 25
Specified Weight 220 grams
Max Air Pressure (psi) 145
Made In Pro Data
Available Sizes 23-622 (700x23C)
25-622 (700x25C)

Vittoria Open Corsa CX III Latex Tube 25 Test Results

Vittoria Open Corsa CX III Latex Tube 25 road bike tire on a rolling resistance test machine

Size, Weight, and Thickness Measurements


Size, Weight and Thickness Measurements
Specified Weight 220 grams
Measured Weight 237 grams
System Adjusted Weight
(tire + inner tube (100 gr)
337 grams
Measured Width 28 mm (un-round)
Measured Height 25 mm (un-round)
Total Tire Thickness Center No Data
Total Tire Thickness Sidewall Pro Data
Unmounted Casing Width No Data
Unmounted Tread Width No Data
Tread Cover (Tread / Casing Ratio) 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.

No differences, same as butyl inner tube.

Rolling Resistance Test Results


Rolling Resistance Test Results
Inner Tube Michelin Latex
Measured Width 28 mm (un-round)
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 bar
Ultra High Air Pressure

(108 psi / 7.4 bar)
Pro Data
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 bar
Extra High Air Pressure

(90 psi / 6.2 bar)
Pro Data
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 bar
High Air Pressure

(72 psi /5.0 bar)
13.0 Watts
CRR: 0.00390
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 bar
Medium Air Pressure

(54 psi / 3.7 bar)
Pro Data
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.

The latex tube definitely has less rolling resistance when compared to the butyl tube, although the difference isn't as big as seen with mountain bike tires Read my special MTB article. Tests are run at 18 mph / 29 km/h, which might be a little low for road bikes.


  • At 120 psi / 8.3 bar, the latex inner tube has 1.3 watts less rolling resistance.
  • At 120 psi / 8.3 bar, Coefficient of rolling resistance (CRR) is 0.00039 lower

  • At 100 psi / 6.9 bar, the latex inner tube has 1.4 watts less rolling resistance.
  • At 100 psi / 6.9 bar, Coefficient of rolling resistance (CRR) is 0.0042 lower

  • At 80 psi / 5.5 bar, the latex inner tube has 1.8 watts less rolling resistance.
  • At 80 psi / 5.5 bar, Coefficient of rolling resistance (CRR) is 0.00054 lower

  • At 60 psi / 4.1 bar, the latex inner tube has 2.3 watts less rolling resistance.
  • At 60 psi / 4.1 bar, Coefficient of rolling resistance (CRR) is 0.00069 lower

Puncture Resistance Test Results

Vittoria Open Corsa CX III Latex Tube 25 road bike tire on a rolling resistance test machine
Puncture Resistance Test Results (higher is better)
Total Puncture Score Tread No Data
Total Puncture Score Sidewall Pro Data
Tread Puncture Force Sharp Needle 12 Points
Tread Puncture Force Blunt Needle No Data
Tread Total Tire Thickness No Data
Sidewall Puncture Force Sharp Needle Pro Data
Sidewall Puncture Force Blunt Needle No Data
Sidewall Total Tire Thickness Pro Data

No differences, same as butyl inner tube.

Static Grip Test Results


NOTE: Grip test data is only available on tires tested after November 2018. You can find more information about our grip test here: Introducing Grip Testing

Static Grip Test Results
Wet Grip Average No Data
Wet Grip Center No Data
Wet Grip Edge No Data
Grip in points = coefficient of friction * 100
Road bike grip test rim width = 19.0 mm

Conclusion


This is just added to the database as a reference, I've added an updated conclusion to the GP4000S II with latex tube review Read Here

RATING: 4.0 / 5
TEST VERDICT:
Recommended


Comments



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