Radium Performance® SR125 Wheels V3 (Kegel Core)

Radium Performance® SR125 Road feel without compromise. Now Kegel compatible. Urethane is precise but punishing. Pneumatic is grippy but high-maintenance. The SR125 doesn't ask you to choose. Stability Glassy smooth at 45+ mph. Engineered balance that inspires confidence at speed. Carve Offset core design enables tight, low-speed turns and makes carving effortless. Grip Rivals pneumatic grip levels, but with more forgiving grip-slip transition at the limit. Comfort Compression holes and soft NR/SBR rubber absorb road noise on and off pavement. Hybrid Kegel Core System Standard Kegel cores and big rubber wheels don't get along — regular 22mm skate bearings weren't built for the lateral forces a 125mm wheel generates at speed. Our hybrid approach solves it: a 28mm mountainboard-spec bearing seat handles the heavy load on the outside, while a standard 22mm seat on the inside preserves the Kegel mounting pattern. Full Kegel compatibility. No bearing failures. O-Ring Bearing Retention Metal cores demand tight tolerances — which makes installing and removing bearings a chore, and creates wear if there's any movement in the seat. The O-ring system keeps bearings locked and creak-free, protecting the seat long-term. Compatibility Pin diameter of 5.6mm — check your pulleys and adapters before ordering. Most plastic pulleys Metal pulleys with pins ≤ 5.5mm diameter Gear drive adapters — only compatible with pins < 5.5mm diameter. Check before ordering. Specifications Dimensions 125 × 75mm Profile Square with rounded corners Compound High-grip NR/SBR rubber Core material 6061-T6 aluminium Core pattern Kegel (5.6mm holes) Bearing seats 22mm inner / 28mm outer, 10mm spacing Retention O-ring system Weight 700g per wheel Includes 4 wheels + O-rings Excludes Bearings (sold separately) Bearings not included. Pick up a set of high-performance bearings here →