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Schwalbe 'Racing Ralph HS 425' Clincher for Cyclocross
The Schwalbe Racing Ralph cyclocross tire is a lightweight clincher tire (also available in tubular) with an aggressive tread pattern.
I tested the 'Evo' version 'Racing Ralph HS 425' on my Moots Psychlo X RSL.
The Racing Ralph offers very good grip with low rolling resistance, though on pavement one can clearly feel the extra effort as compared with a smooth road racing tire— to be expected of course.
Road noise is relatively low, and the tires actually roll quite well if one inflates them to 60-70 PSI. But that pressure is not friendly on rough ground.
The specifications call for 30-85 psi, but pinch flats are a risk under 50 psi, so I ride mine around 65 psi. With appropriate trails, 50 psi is probably a reasonable pressure, and 65 psi can be a bit harsh on rough trails.
On hardpack with loose fine gravel, the grip is excellent.
Weight as weighed
I saw a 22g weight variation in the two tires I weighed:
The nominal weight of 320g is much higher than the actual as-weighed figure.
Specifications are for the 'Evo' version, 33-622
Use: Cyclocross Size: 622/700C Width: 33mm Weight: 320g (nominal) TPI: 260 PSI: 30-85 Construction: Black-Skin, PaceStar compound