The Ultremo ZX Evolution 700 x 25C V-Guard was the high-end, all-round road bike tire from Schwalbe, suitable for racing and training. The Ultremo ZX has a triple compound RaceStar compound, which is optimized for grip, rolling resistance and long service life. V-Guard means it has an extra puncture resistant layer that helps prevent flat tires but obviously adds rolling resistance. There is a version without the puncture resistant layer available from Schwalbe as well: the Ultremo ZLX.
Since the beginning of 2014, Schwalbe has a new top of the line road bike tire: the Schwalbe One. Read our review of the new Schwalbe One here. The One has a much lower rolling resistance and seems to be a big improvement over the Ultremo.
|Tire Type||Tubetype (clincher)|
|Supplied By||Bought in store|
|New or Used||New|
|Specified Weight||215 grams|
Size and Weight Measurements
|Size and Weight Measurements (Bike Wheel: 622x17C, Pressure: 100 psi / 6.9 bar)|
|Specified Weight||215 grams|
|Measured Weight||229 grams|
|Measured Width||25 mm|
|Measured Height||23 mm|
|Total Tire Thickness Center||No Data|
|Total Tire Thickness Sidewall||No Data|
This tire also can't touch it's specified weight of 215 grams with a measured weight of 229 grams. Volume wise, this tire has a real width of 25 mm on a 17C rim, which means it's a true 25C tire, but it's a bit smaller when compared to most other 25C tires.
Rolling Resistance Test Results
|Rolling Resistance Test Results (Speed: 29 kmh / 18 mph, Load: 42.5 kg)|
|Inner Tube||Conti Race28 (100gr butyl)|
|Rolling Resistance 140 psi / 9.7 Bar||Not Tested|
|Rolling Resistance 120 psi / 8.3 Bar||14.1 Watts|
|Rolling Resistance 100 PSI / 6.9 Bar||15.0 Watts|
|Rolling Resistance 80 PSI / 5.5 Bar||16.3 Watts|
|Rolling Resistance 60 PSI / 4.1 Bar||19.5 Watts|
|Rolling Resistance Coefficient (Crr) 140 psi / 9.7 Bar||Not Tested|
|Rolling Resistance Coefficient (Crr) 120 psi / 8.3 Bar||0.00423|
|Rolling Resistance Coefficient (Crr) 100 psi / 6.9 Bar||0.00450|
|Rolling Resistance Coefficient (Crr) 80 psi / 5.5 Bar||0.00489|
|Rolling Resistance Coefficient (Crr) 60 psi / 4.1 Bar||0.00585|
The Ultremo ZX can't compete with other road bike tires in the same class when solely looking at rolling resistance. At an air pressure of 120 psi, rolling resistance is 14.1 watts. At an air pressure of 100 psi, rolling resistance is 15.0 watts. Dropping pressure to 80 psi results in a rolling resistance of 16.1 watts. The Ultremo ZX gets outclassed by cheaper tires like the Vittoria Rubino Pro and Continental Grand Prix in the rolling resistance test.
Puncture Resistance Test Results
|Puncture Resistance Test Results (higher is better)|
|Puncture Resistance Tread||12|
|Puncture Resistance Sidewall||Not Tested|
The Ultremo ZX also isn't able to do anything exciting in the puncture resistance test. With a score of 12 in the puncture resistance test it sets an average score and doesn't impress.
I find it hard to judge this tire. Rolling resistance isn't very low and puncture resistance isn't very good, it doesn't really stand out in anything. It might have a small disadvantage in the rolling resistance test because it's a true 25 mm tire while most other 25C tires are a bit bigger. Maybe it has great wear and grip, but that's for others to test.
When focusing purely on rolling resistance and puncture resistance (which is what we do at Bicycle Rolling Resistance) you're better off buying a Continental Grand Prix or Vittoria Rubino Pro. Those tires score better in every test and you even pay less as a bonus.
TEST VERDICT: Not Recommended
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