CX/Gravel Tire Comparison:
Challenge Gravel Grinder 33 2020 vs
Panaracer GravelKing TLC 32 2022

Contents and Test Summary

  1. Manufacturer Specifications
  2. Size and Weight Measurements
  3. Rolling Resistance Test Results
  4. Puncture Resistance Test Results
  5. Static Grip Test Results
  6. Conclusion
  • Challenge Gravel Grinder 33
  • Panaracer GravelKing TLC 32
Performance compared to all other CX/Gravel tires
(100% is best)
Pro Members get 11-point radar charts

Manufacturer Specifications


Manufacturer Specifications
Brand ChallengePanaracer
Model Gravel Grinder 33GravelKing TLC 32
Year 20202022
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
Manufacturer Part Number 00535RF732-GKS-B
EAN 8855627005356
TPI 260-
Compound ZSG
Bead FoldingFolding
ETRTO 33-62232-622
Specified Weight 0 grams290 grams
Min Air Pressure 35 psi psi
Max Air Pressure 75 psi95 psi
Made In Pro DataPro Data
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 32 2022
Image 2
Challenge Gravel Grinder 33 2020
Panaracer GravelKing TLC 32 2022
Image 3
Challenge Gravel Grinder 33 2020
Panaracer GravelKing TLC 32 2022
Image 4 Not AvailableNot Available

Size and Weight Measurements


Size and Weight Measurements
Model Gravel Grinder 33GravelKing TLC 32
Specified Weight 0 grams290 grams
Measured Weight 412 grams283 grams
Measured Width Casing 33 mm (un-round)31 mm (un-round)
Measured Width Tread 33 mm31 mm
Measured Height 31 mm (un-round)28 mm (un-round)
Measured Knob Height Center 0.7 mm0.1 mm
Measured Knob Height Edge 2.3 mm0.2 mm
Measured Casing Thickness Center 2.60 mm2.30 mm
Measured Total Thickness Sidewall Pro DataPro Data
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 32
Spin Up Video YouTubeNo Video
Inner Tube Conti Cross28 (160 gr)None (30 ml sealant)
Measured Width 33 mm31 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 barHigh Air Pressure		 Pro DataPro Data
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 barMedium Air Pressure		 Pro DataPro Data
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 barLow Air Pressure		 28.7 Watts
CRR: 0.00860
(40 psi / 2.8 bar)		19.0 Watts
CRR: 0.00570
(44 psi / 3.0 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 barExtra Low Air Pressure		 Pro DataPro Data
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 32
Total Puncture Score Tread 62 Points51 Points
Total Puncture Score Sidewall Pro DataPro Data
Tread Puncture Force Sharp Needle Pro DataPro Data
Tread Puncture Force Blunt Needle Pro DataPro Data
Tread Total Tire Thickness 2.6 mm2.3 mm
Sidewall Puncture Force Sharp Needle Pro DataPro Data
Sidewall Puncture Force Blunt Needle Pro DataPro Data
Sidewall Total Tire Thickness Pro DataPro Data

Static Grip Test Results


Static Grip Test Results (higher is better)
Model Gravel Grinder 33GravelKing TLC 32
Wet Grip Average 53 Points59 Points
Wet Grip Center Pro DataPro Data
Wet Grip Edge Pro DataPro Data
Measured Knob Height Center 0.7 mm0.1 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 32
Full Review Full ReviewFull Review
Verdict RecommendedRecommended
Rating 3.5 / 54.0 / 5
Buy At
  • Challenge Gravel Grinder 33
  • Panaracer GravelKing TLC 32
Performance compared to all other CX/Gravel tires
(100% is fastest - lightest - highest - strongest)
Pro Members get 11-point radar charts