CX/Gravel Tire Test: Challenge Gravel Grinder

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Contents and Test Summary

  1. Introduction
  2. Manufacturer Specifications
  3. Size, Weight, Thickness
  4. Rolling Resistance: 28.7 watts
  5. Puncture Resistance: 15 tread / 4 sidewall
  6. Conclusion: 3.5 / 5 Recommended
  7. Comments
  • Challenge Gravel Grinder
Performance compared to all other CX/Gravel tires
(100% is fastest - lightest - highest - strongest)

Challenge Gravel Grinder road bike tire on a rolling resistance test machine

The Challenge Gravel Grinder is a cx/gravel bike tire with a diamond tread in the center and bigger knobs along the edge of the tire. From the outside, the Gravel Grinder looks like it should be faster rolling than the Challenge Grifo Pro (read our review) that we tested a couple of weeks back and which is a much knobbier tire.


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Just like many other tires from Challenge, the Gravel Grinder is available in a lot of different versions. We're testing the handmade Pro version that comes with a tan-colored 260 TPI SuperPoly casing with an extra layer of PPS2 anti-puncture material under the tread.


The Gravel Grinder Pro is available in both a 33 and 36 mm wide version. We've tested the 33 mm version as we had a hard time finding the bigger version.


Manufacturer Specifications


Manufacturer Specs
Brand Challenge
Model Gravel Grinder
Year 2020
Supplied By Bought in store
New or Used New
Mileage 0 km
Price Range High
Buy At Ad Amazon.com
Manufacturer part number 00535
EAN8855627005356
TPI 260
Compound
Bead Folding
ETRTO 33-622
Specified Weight 0 grams
Max Pressure 75
Made In Thailand
Available Sizes 33-622 (700x33x)
36-622 (700x36c)

Challenge Gravel Grinder Test Results

Challenge Gravel Grinder  mountain bike tire on a rolling resistance test machine

Size, Weight, and Thickness Measurements


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Size, Weight, and Thickness Measurements
Specified Weight 0 grams
Measured Weight 412 grams
Measured Width Casing 33 mm
Measured Width Tread 33 mm
Measured Height 31 mm
Measured Knob Height Center 0.7 mm
Measured Knob Height Edge 2.3 mm
Measured Total Thickness Sidewall 1.20 mm
Measured Total Thickness Center (excluding knobs) 2.60 mm
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
Inner Tube Conti Cross28 (160 gr)
Measured Width 33 mm
Rolling Resistance
Real tire width in mm:
30-32 = 66 psi/4.6 bar
33-35 = 60 psi/4.1 bar
36-40 = 54 psi/3.7 bar
High Air Pressure
23.5Watts
CRR: 0.00704
Rolling Resistance
Real tire width in mm:
30-32 = 55 psi/3.8 bar
33-35 = 50 psi/3.4 bar
36-40 = 45 psi/3.1 bar
Medium Air Pressure
25.1 Watts
CRR: 0.00752
Rolling Resistance
Real tire width in mm:
30-32 = 44 psi/3.0 bar
33-35 = 40 psi/2.8 bar
36-40 = 36 psi/2.6 bar
Low Air Pressure
28.7 Watts
CRR: 0.00860
Rolling Resistance
Real tire width in mm:
30-32 = 33 psi/2.3 bar
33-35 = 30 psi/2.1 bar
36-40 = 27 psi/1.9bar
Extra Low Air Pressure
33.9 Watts
CRR: 0.01016
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

Challenge Gravel Grinder  mountain bike tire on a rolling resistance test machine
Puncture Resistance Test Result (higher is better)
Puncture Resistance Tread 15 Points
Puncture Resistance Sidewall 4 Points

Conclusion


  • Challenge Gravel Grinder
Performance compared to all other CX/Gravel tires
(100% is fastest - lightest - highest - strongest)

The Gravel Grinder Pro scores very well in the tread puncture resistance test. The sidewalls on the other hand are quite weak which makes this an unbalanced tire in the puncture resistance department. Rolling Resistance isn't all that low although when compared to the fastest tires, the difference is manageable.


This can be a good tire if it fits your specific needs. We're not all that excited about this tire as the weak sidewalls can become a problem on gravel. Check the CX/Gravel overview page to compare for yourself.


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RATING: 3.5 / 5
TEST VERDICT:
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