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

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Vittoria Open Corsa CX III Latex Tube 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"
Width 25
Specified Weight 220 grams
Max Pressure 145
Made In Members Only
Available Sizes 23-622 (700x23C)
25-622 (700x25C)

Vittoria Open Corsa CX III Latex Tube Test Results

Vittoria Open Corsa CX III Latex Tube 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 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 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.

No differences, same as butyl inner tube.

Rolling Resistance Test Results


Rolling Resistance Test Results
Inner Tube Michelin Latex
Rolling Resistance
140 PSI / 9.7 Bar
Not Tested
Rolling Resistance
120 PSI / 8.3 Bar
11.7 Watts
CRR: 0.00351
Rolling Resistance
100 PSI / 6.9 Bar
12.2 Watts
CRR: 0.00366
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.

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 road bike tire on a rolling resistance test machine
Puncture Resistance Test Results (higher is better)
Puncture Resistance Tread 12 Points
Puncture Resistance Sidewall Members Only

No differences, same as butyl inner tube.

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


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