Tire Test - Continental Race King RaceSport Tubeless

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Continental Race King RaceSport Tubeless mountain bike tire on a rolling resistance test machine

This review is a comparison between a traditional butyl inner tube and a tubeless mountain bike set up, which is something I always wanted to know. I have chosen the Continental Race King RaceSport 29 x 2.2 for this test because it proved to be the fastest of the three mountain bike tires I had the chance to test up to now. I'm going to assume the difference shown in this review will be the same for every other tire out there (a 29 x 2.2/2.25 at least). So you can use this as a reference to calculate the rolling resistance of a tire when mounted tubeless.


Check Continental Race King RaceSport Tubeless Prices at Amazon.com


As a reference, this review has now been superseded by a much more detailed special article which also includes a latex tube and measurements at 15 psi / 1.0 bar. I highly recommend you to read the special article instead of this short review.


During normal testing, I use a standard Continental 29er butyl inner tube with a weight of 225 grams. For this test, I mounted the tire with tubeless rim tape and 60 ml Stan's NoTubes tubeless sealant to seal it. Even though this tire is not rated Tubeless-Ready, it was no problem to get it inflated (with a compressor), although it did take 3 days to completely seal. I've been using a Race King RaceSport with 60 ml sealant on my own bike for some time already. With this set up there is a 150 grams weight advantage for the tubeless tire.


Manufacturer Specs
Brand Continental
Model Race King RaceSport Tubeless
Year 2014
Supplied By Bought in store
New or Used New
Mileage 0 km
Price Range High
Price Amazon.com
Part Number 0100545
TPI 3/180
Compound Black Chili
Bead Folding
ETRTO 57-622
Size Inch 29"
Width Inch 2.20
Specified Weight 540 grams
Max Pressure 65
Made In Germany
Available Sizes 29 x 2.20
29 x 2.00
27.5 x 2.20
26 x 2.20
26 x 2.00

Test Results


Continental Race King RaceSport Tubeless  mountain bike tire on a rolling resistance test machine

Size and Weight Measurements


Size and Weight Measurements (Bike Wheel: 622-17C, Pressure: 35 psi / 2.4 bar)
Specified Weight 540 grams
Measured Weight 497 grams
Measured Width Carcass 55 mm
Measured Width Tread 51 mm
Measured Height 53 mm
Measured Knob Height Center 2.5 mm
Measured Knob Height Edge 2.5 mm
Measured Total Thickness Sidewall 0.45 mm
Measured Total Thickness Center (excluding knobs) 1.70 mm

No difference, same as with inner tube.


Rolling Resistance Test Results


Rolling Resistance Test Results (Speed: 29 kmh / 18 mph, Load: 42.5 kg)
Inner Tube None (60 ml sealant)
Rolling Resistance 55 psi / 3,8 Bar 15.5 Watts
Rolling Resistance 45 psi / 3,1 Bar 15.8 Watts
Rolling Resistance 35 psi / 2,4 Bar 16.2 Watts
Rolling Resistance 25 psi / 1,7 Bar 17.4 Watts
Rolling Resistance Coefficient (Crr) 55 psi / 3,8 Bar 0.00465
Rolling Resistance Coefficient (Crr) 45 psi / 3,1 Bar 0.00474
Rolling Resistance Coefficient (Crr) 35 psi / 2,4 Bar 0.00486
Rolling Resistance Coefficient (Crr) 25 psi / 1,7 Bar 0.00522

When comparing the exact same tires, with the only difference being a tubeless set up or a butyl inner tube.


  • At 55 psi/3.8 bar, the tubeless set up has 2.5 watts less rolling resistance
  • At 45 psi/3.1 bar, the tubeless set up has 2.9 watts less rolling resistance
  • At 35 psi/2.4 bar, the tubeless set up has 3.8 watts less rolling resistance
  • At 25 psi/1.7 bar, the tubeless set up has 5.0 watts less rolling resistance


Puncture Resistance Test Results


Puncture Resistance Test Result (higher is better)
Puncture Resistance Tread 7
Puncture Resistance Sidewall 4

No difference, same as with inner tube.




Conclusion


Continental Race King RaceSport Tubeless  mountain bike tire on a rolling resistance test machine

The lower the pressure, the bigger the advantage for the tubeless mountain bike tire. At a pressure of 55 psi, there is a 2.5 watts advantage for the tubeless tire. Dropping pressure to 25 psi results in a 5 watts per tire advantage for the tubeless tire. When going off road you want low air pressure tires for increased grip, comfort, power efficiency and lower surface rolling resistance. With a drop off in tire rolling resistance of just 1.9 watts between a high pressure of 55 psi and a low pressure of 25 psi, this is certainly true for this tubeless mounted Race King.


Check Continental Race King RaceSport Tubeless Prices at Amazon.com


RATING: 5 / 5
VERDICT:
Highly Recommended


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Continental Race King RaceSport Tubeless mountain bike tire on a rolling resistance test machine
Continental Race King RaceSport Tubeless mountain bike tire on a rolling resistance test machine
Continental Race King RaceSport Tubeless mountain bike tire on a rolling resistance test machine

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