Slightly less spring tension than the standard ATAC pedals. All models feature: Auto Tension Adjustment Concept where foot retention is independent from spring tension, Sensor Elasticity Tuner for adjustable sensation of float, 10 degree rotational/6mm lateral float, 13 or 17 degree release, self-cleaning double sided step in with wide entry area. ROC Carbon: carbon reinforced composite body, chromed steel spindles. ROC-S: composite body, chromed steel spindles. ROC: composite body, steel spindles.