Road Bike Tire Test: Continental Grand Prix 4000S II Latex Tube

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Contents and Test Summary

  1. Introduction
  2. Manufacturer Specifications
  3. Size, Weight, Thickness
  4. Rolling Resistance: 10.6 watts
  5. Puncture Resistance: 11 tread / 5 sidewall
  6. Conclusion: 5.0 / 5 Highly Recommended
  7. Comments
  • Continental Grand Prix 4000S II Latex Tube
Performance compared to all other road bike tires
(100% is fastest - lightest - thickest - strongest)

Continental Grand Prix 4000S II Latex Tube road bike tire on a rolling resistance test machine

This is a retest of the Continental Grand Prix 4000S II reviewed Here except this time 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 to test a latex inner tube simply because it's the fastest road bike tire I had the chance to test up to now. I've also tested the Vittoria Open Corsa CX III with a latex tube, results are Here. Why a Michelin latex tube instead of some other brand? Because it's the cheapest and best available latex tube.


Ad Buy Continental Grand Prix 4000S II Latex Tube at Amazon.com


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


Everybody wants "free" speed, latex tubes are faster for sure but have some disadvantages when compared to butyl inner tubes as well. The biggest problem is that latex tubes lose pressure quite quickly. When setting air pressure to 100 psi in the morning, you'll probably only have 90 psi left over in the evening and 80 psi the next day. This means you will have to check air pressure and inflate your tires every day. If you just want to set and forget, stick to standard butyl tubes. The second problem is that you have to be really careful when mounting your tires and make sure your rim does not have any sharp edges as these will rip the latex tube apart.


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 Continental
Model Grand Prix 4000S II 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 Ad Amazon.com
Manufacturer part number 0100945
TPI 3/330
Compound Black Chili
Bead Folding
ETRTO 25-622
Size Inch 28"
Width 25
Specified Weight 225 grams
Max Pressure 120
Made In Germany
Available Sizes 20-622 (700x20C)
23-622 (700x23C)
25-622 (700x25C)
28-622 (700x28C)
23-571 (650x23C)

Continental Grand Prix 4000S II Latex Tube Test Results

Continental Grand Prix 4000S II 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 225 grams
Measured Weight 215 grams
System Adjusted Weight
(tire + inner tube (100 gr)
315 grams
Measured Width 27 mm
Measured Height 25 mm
Total Tire Thickness Center 2.9 mm
Total Tire Thickness Sidewall 0.55 mm
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 with 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
10.6 Watts
CRR: 0.00318
Rolling Resistance
100 PSI / 6.9 Bar
11.1 Watts
CRR: 0.00333
Rolling Resistance
80 PSI / 5.5 Bar
11.8 Watts
CRR: 0.00354
Rolling Resistance
60 PSI / 4.1 Bar
13.3 Watts
CRR: 0.00399
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 lower air pressures, the differences start getting bigger but nothing extreme. A breakdown of the differences at different air pressures:


  • At 120 psi / 8.3 bar, the latex inner tube has 1.6 watts less rolling resistance.
  • At 120 psi / 8.3 bar, Coefficient of rolling resistance (CRR) is 0.00048 lower

  • At 100 psi / 6.9 bar, the latex inner tube has 1.8 watts less rolling resistance.
  • At 100 psi / 6.9 bar, Coefficient of rolling resistance (CRR) is 0.00054 lower

  • At 80 psi / 5.5 bar, the latex inner tube has 1.9 watts less rolling resistance.
  • At 80 psi / 5.5 bar, Coefficient of rolling resistance (CRR) is 0.00057 lower

  • At 60 psi / 4.1 bar, the latex inner tube has 2.2 watts less rolling resistance.
  • At 60 psi / 4.1 bar, Coefficient of rolling resistance (CRR) is 0.00066 lower

Puncture Resistance Test Results

Continental Grand Prix 4000S II Latex Tube road bike tire on a rolling resistance test machine
Puncture Resistance Test Results (higher is better)
Puncture Resistance Tread 11 Points
Puncture Resistance Sidewall 5 Points

No differences, same as with butyl inner tube.

Conclusion


  • Continental Grand Prix 4000S II Latex Tube
Performance compared to all other road bike tires
(100% is fastest - lightest - thickest - strongest)

If you want pure speed, latex inner tubes are definitely worth the trouble. When making a correction for an average road bike speed of 23 mph / 36 km/h and a tire pressure of 120 psi, a pair of latex inner tubes have 4 watts less rolling resistance. If you like to run lower pressures, you will save close to 5 watts at 80 psi.


If you ride your bike every day, the 4 to 5 watts lower rolling resistance might not be worth the trouble of having to check air pressure and re-inflate your tires every day. If you forget to check air pressure before a ride, rolling resistance might actually be higher because of the lower air pressure.


  • For maximizing performance : Latex inner tubes
  • Set and forget: Butyl inner tubes

Update after testing the Vittoria Open Corsa CX III with a latex tube:


The differences between the Continental Grand Prix 4000S II and Vittoria Open Corsa CX III with latex tubes vs butyl tubes are small. The difference of at most 0.4 watts in a 4 part measurement is too small to draw a conclusion. I think you can use these 2 comparisons as a reference of how much you will gain with a latex tube, even if you have tires with very high rolling resistance or very low rolling resistance, the difference should be about 4-5 watts for a pair of tires when going for latex tubes.

Ad Buy Continental Grand Prix 4000S II Latex Tube at Amazon.com


RATING: 5.0 / 5
TEST VERDICT:
Highly Recommended


Comments



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