CX/Gravel Tire Comparison:
Challenge Gravel Grinder 33 2020 vs
Continental Terra Speed TR 35 2020




Manufacturer Specifications


Manufacturer Specifications
Brand ChallengeContinental
Model Gravel Grinder 33Terra Speed TR 35
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
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Manufacturer Part Number 005350101693
EAN 88556270053564019238027013
TPI 2603/180
Compound Black Chili
Bead FoldingFolding
ETRTO 33-62235-622
Specified Weight 0 grams360 grams
Min Air Pressure 35 psi44 psi
Max Air Pressure 75 psi73 psi
Made In Members OnlyMembers Only
Available Sizes 33-622 (700x33x)
36-622 (700x36c)
35-622 (700x35c)
40-622 (700x40c)
45-622 (700x45c)
35-584 (650x35b)
40-584 (650x40b)
Image 1
Challenge Gravel Grinder 33 2020
Continental Terra Speed TR 35 2020
Image 2
Challenge Gravel Grinder 33 2020
Continental Terra Speed TR 35 2020
Image 3
Challenge Gravel Grinder 33 2020
Continental Terra Speed TR 35 2020
Image 4 Not AvailableNot Available

Size and Weight Measurements


Size and Weight Measurements
Model Gravel Grinder 33Terra Speed TR 35
Specified Weight 0 grams360 grams
Measured Weight 412 grams378 grams
Measured Width Casing 33 mm (un-round)33 mm (un-round)
Measured Width Tread 33 mm33 mm
Measured Height 31 mm (un-round)31 mm (un-round)
Measured Knob Height Center 0.7 mm1.1 mm
Measured Knob Height Edge 2.3 mm1.2 mm
Measured Casing Thickness Center 2.60 mm1.90 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 33Terra Speed TR 35
Spin Up Video YouTubeYouTube
Inner Tube Conti Cross28 (160 gr)None (30 ml sealant)
Measured Width 33 mm33 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
(40 psi / 2.8 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)
20.3 Watts
CRR: 0.00609
(30 psi / 2.1 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 33Terra Speed TR 35
Total Puncture Score Tread 62 Points32 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 mm1.9 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 33Terra Speed TR 35
Wet Grip Average 53 Points58 Points
Wet Grip Center Members OnlyMembers Only
Wet Grip Edge Members OnlyMembers Only
Measured Knob Height Center 0.7 mm1.1 mm
Measured Knob Height Edge 2.3 mm1.2 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 33Terra Speed TR 35
Full Review Full ReviewFull Review
Verdict RecommendedHighly Recommended
Rating 3.5 / 55.0 / 5
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  • Challenge Gravel Grinder 33
  • Continental Terra Speed TR 35
Performance compared to all other CX/Gravel tires
(100% is fastest - lightest - highest - strongest)

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