CX/Gravel Tire Comparison:
Challenge Gravel Grinder 33 2020 vs
Panaracer GravelKing TLC 40 2020




Manufacturer Specifications


Manufacturer Specifications
Brand ChallengePanaracer
Model Gravel Grinder 33GravelKing TLC 40
Year 20202020
Supplied By Bought in storeBought in store
Full Review Full ReviewFull Review
New or Used NewNew
Mileage 0 km0 km
Price Range HighHigh
Buy At Ad Amazon.comAd Amazon.com
Manufacturer Part Number 00535RF738-GK-B
EAN 88556270053564931253016974
TPI 260-
Compound ZSG
Bead FoldingFolding
ETRTO 33-62240-622
Specified Weight 0 grams340 grams
Min Air Pressure 35 psi psi
Max Air Pressure 75 psi75 psi
Made In Members OnlyMembers Only
Available Sizes 33-622 (700x33x)
36-622 (700x36c)
32-622 (700x32c)
35-622 (700x35c)
40-622 (700x38c)
38-584 (650bx38)
42-584 (650bx42)
48-584 (650bx48)
Image 1
Challenge Gravel Grinder 33 2020
Panaracer GravelKing TLC 40 2020
Image 2
Challenge Gravel Grinder 33 2020
Panaracer GravelKing TLC 40 2020
Image 3
Challenge Gravel Grinder 33 2020
Panaracer GravelKing TLC 40 2020
Image 4 Not AvailableNot Available

Size and Weight Measurements


Size and Weight Measurements
Model Gravel Grinder 33GravelKing TLC 40
Specified Weight 0 grams340 grams
Measured Weight 412 grams337 grams
Measured Width Casing 33 mm (un-round)37 mm (un-round)
Measured Width Tread 33 mm34 mm
Measured Height 31 mm (un-round)33 mm (un-round)
Measured Knob Height Center 0.7 mm0.2 mm
Measured Knob Height Edge 2.3 mm0.2 mm
Measured Casing Thickness Center 2.60 mm1.80 mm
Measured Total Thickness Sidewall Members OnlyMembers Only
All size measurements are taken at low air pressure on a 17.8 mm inner width rim.

Rolling Resistance Test Results


Rolling Resistance Test Results
Model Gravel Grinder 33GravelKing TLC 40
Spin Up Video YouTubeYouTube
Inner Tube Conti Cross28 (160 gr)None (30 ml sealant)
Measured Width 33 mm37 mm
Rolling Resistance
Real tire width in mm:
30-32 = 66 psi/4.6 bar
33-35 = 60 psi/4.1 bar
36-38 = 54 psi/3.7 bar
39-42 = 50 psi/3.4 bar
43-46 = 46 psi/3.2 bar
47-50 = 42 psi/2.9 bar
High Air Pressure
Members OnlyMembers Only
Rolling Resistance
Real tire width in mm:
30-32 = 55 psi/3.8 bar
33-35 = 50 psi/3.4 bar
36-38 = 45 psi/3.1 bar
39-42 = 42 psi/2.9 bar
43-46 = 38 psi/2.6 bar
47-50 = 35 psi/2.4 bar
Medium Air Pressure
Members OnlyMembers Only
Rolling Resistance
Real tire width in mm:
30-32 = 44 psi/3.0 bar
33-35 = 40 psi/2.8 bar
36-38 = 36 psi/2.6 bar
39-42 = 33 psi/2.3 bar
43-46 = 31 psi/2.1 bar
47-50 = 28 psi/1.9 bar
Low Air Pressure
28.7 Watts
CRR: 0.00860
(40 psi / 2.8 bar)
17.0 Watts
CRR: 0.00510
(36 psi / 2.6 bar)
Rolling Resistance
Real tire width in mm:
30-32 = 33 psi/2.3 bar
33-35 = 30 psi/2.1 bar
36-38 = 27 psi/1.9 bar
39-42 = 25 psi/1.7 bar
43-46 = 23 psi/1.6 bar
47-50 = 21 psi/1.4 bar
Extra Low Air Pressure
33.9 Watts
CRR: 0.01016
(30 psi / 2.1 bar)
19.9 Watts
CRR: 0.00597
(27 psi / 1.9 bar)
The CX/Gravel 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 Gravel Grinder 33GravelKing TLC 40
Total Puncture Score Tread 62 Points28 Points
Total Puncture Score Sidewall Members OnlyMembers Only
Tread Puncture Force Sharp Needle Members OnlyMembers Only
Tread Puncture Force Blunt Needle Members OnlyMembers Only
Tread Total Tire Thickness 2.6 mm1.8 mm
Sidewall Puncture Force Sharp Needle Members OnlyMembers Only
Sidewall Puncture Force Blunt Needle Members OnlyMembers Only
Sidewall Total Tire Thickness Members OnlyMembers Only

Static Grip Test Results


Static Grip Test Results (higher is better)
Model Gravel Grinder 33GravelKing TLC 40
Wet Grip Average 53 Points62 Points
Wet Grip Center Members OnlyMembers Only
Wet Grip Edge Members OnlyMembers Only
Measured Knob Height Center 0.7 mm0.2 mm
Measured Knob Height Edge 2.3 mm0.2 mm
Grip in points = coefficient of friction * 100
CX/Gravel grip test rim width = 23.0 mm
Wet Grip Test and Off-Road Tires (info)

Conclusion


Conclusion
Model Gravel Grinder 33GravelKing TLC 40
Full Review Full ReviewFull Review
Verdict RecommendedRecommended
Rating 3.5 / 54.0 / 5
Buy At Ad Amazon.comAd Amazon.com
  • Challenge Gravel Grinder 33
  • Panaracer GravelKing TLC 40
Performance compared to all other CX/Gravel tires
(100% is fastest - lightest - highest - strongest)

Pro Members get 11-point radar charts