Tire Test - Specialized S-Works Ground Control

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Specialized S-Works Ground Control mountain bike tire on a rolling resistance test machine

The Specialized S-Works Ground Control is the second Specialized MTB tire I've tested. I've already tested the S-Works Fast Trak and, although it's slower than comparable tires from Schwalbe and Conti, it performed quite well in the rolling resistance tests. I think it's interesting to take a look at another Specialized tire with some bigger knobs and see how it compares to the fast Schwalbe Nobby Nic SnakeSkin and big knobbed Conti Mountain King RaceSport.


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I've tested the S-Works versions of the Specialized MTB tires as these are the top of the line products which use the best materials, have the lowest weight, and cost the most. The S-Works versions come with an extra-subtle and light-weight 120 TPI carcass, 2Bliss-Ready folding beads (tubeless ready), and a 60a compound. All of this should make this a good tire, but it's always interesting to get to know about the ins and outs of how this tire is built and performs.


Manufacturer Specs
Brand Specialized
Model S-Works Ground Control
Year 2016
Supplied By Bought in store
New or Used New
Mileage 0 km
Price Range High
Price
Part Number 0012-5007
TPI 120
Compound 60a
Bead Folding
ETRTO 58-622
Size Inch 29"
Width Inch 2.30
Specified Weight 650 grams
Max Pressure 50
Made In Taiwan
Available Sizes 29 x 2.30
29 x 2.10
27.5 x 2.30
27.5 x 2.10
26 x 2.30
26 x 2.10

Test Results


Specialized S-Works Ground Control  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 650 grams
Measured Weight 686 grams
Measured Width Carcass 53 mm
Measured Width Tread 56 mm
Measured Height 53 mm
Measured Knob Height Center 3.2 mm
Measured Knob Height Edge 4.5 mm
Measured Total Thickness Sidewall 0.50 mm
Measured Total Thickness Center (excluding knobs) 1.80 mm

While the specified weight of the 29 x 2.3 S-Works Ground Control is 650 grams, the measured weight comes in at 686 grams. The carcass measures 53 mm wide, height is 53 mm as well. The big edge knobs stick out a bit further making the total width of the tire 56 mm on a 17C rim at 35 psi / 2.4 bars.


With a height of 3.2 mm, the center knobs are a bit smaller than expected. Both the Schwalbe Nobby Nic (3.6 mm) (read review) and Continental Mountain King (4.1 mm) (read review) have bigger center knobs. The knobs at the edge of the tread come in at 4.5 mm which is a bit closer to the competition (4.7 mm for both). The sidewalls have a thickness of 0.5 mm, which is similar to other fast tires without reinforced sidewalls.


Rolling Resistance Test Results


Rolling Resistance Test Results (Speed: 29 kmh / 18 mph, Load: 42.5 kg)
Inner Tube Conti MTB 29 (225 gr butyl)
Rolling Resistance 55 psi / 3,8 Bar 24.7 Watts
Rolling Resistance 45 psi / 3,1 Bar 25.5 Watts
Rolling Resistance 35 psi / 2,4 Bar 27.2 Watts
Rolling Resistance 25 psi / 1,7 Bar 31.3 Watts
Rolling Resistance Coefficient (Crr) 55 psi / 3,8 Bar 0.00740
Rolling Resistance Coefficient (Crr) 45 psi / 3,1 Bar 0.00764
Rolling Resistance Coefficient (Crr) 35 psi / 2,4 Bar 0.00815
Rolling Resistance Coefficient (Crr) 25 psi / 1,7 Bar 0.00938

Compared to the Fast Trak (read review) which came in at 28.0 watts, rolling resistance at 25 psi / 1.7 bars has gone up to 31.3 watts. At higher air pressures, the difference gets smaller. Compared to the Schwalbe Nobby Nic SnakeSkin, which has a comparable knob height, rolling resistance is a good bit higher as the Nobby Nic came in at 25.0 watts at 25 psi / 1.7 bars. The Ground Control does outperform the Conti Mountain King by 0.2 watts, but that tire has much bigger knobs.


Just like the Fast Trak, it looks like the Ground Control can't outperform the competition and lags the main competitor by 5-6 watts per tire. It does outperform the Conti Mountain King, but that tire has an extra mm of center knob height. It looks like Specialized has some work to do to improve rolling resistance of the MTB tires by 10-20% if they want to compete with the fastest tires.



Puncture Resistance Test Results


Puncture Resistance Test Result (higher is better)
Puncture Resistance Tread 6
Puncture Resistance Sidewall 5

As the carcasses of both the Fast Trak and Ground Control seem identical, both these tires score 6 points in the tread puncture resistance test and 5 points in the sidewall puncture test. The Nobby Nic SnakeSkin scored 7 points in both those tests which shows the strength of the reinforced sidewalls. The Nobby Nic LiteSkin should have comparable sidewall strength as the Ground Control, but offer an even lower rolling resistance.




Conclusion


Specialized S-Works Ground Control  mountain bike tire on a rolling resistance test machine

The Specialized S-Works Ground Control gets outperformed on all tests (except weight) by the Schwalbe Nobby Nic SnakeSkin (read review) which is a tire in the same class and with comparable knob height. I feel this test once again confirms Specialized lags behind Schwalbe and Continental by close to 20% on rolling resistance in the MTB category but does provide better performance than Maxxis, Kenda, and Vittoria.


I rate the Ground Control 3 out of 5 because it does outperform tires from other brands and performance is decent. It might also have other qualities that make up the higher RR. I do feel the Schwalbe Nobby Nic will provide the best performance if you're looking for a tire in the 3 - 4 mm knob height category. The Nobby Nic LiteSkin should provide an even lower RR than the SnakeSkin I've tested.


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RATING: 3 / 5
VERDICT:
Recommended


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Images


Specialized S-Works Ground Control mountain bike tire on a rolling resistance test machine
Specialized S-Works Ground Control mountain bike tire on a rolling resistance test machine
Specialized S-Works Ground Control mountain bike tire on a rolling resistance test machine

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