Radium Performance® SR125 Wheels V3 (Kegel Core)

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 a 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 — compatible
• Metal pulleys with pins ≤ 5.5mm diameter — compatible
• Gear drive adapters — only compatible with pins under 5.5mm diameter; check before ordering

Specifications

• Dimensions — 125 × 75mm
• Profile — square with rounded corners
• Compound — high-grip NR/SBR rubber
• Core — 6061-T6 aluminium, Kegel pattern (5.6mm holes)
• Bearing seats — 22mm inner / 28mm outer, 10mm spacing
• Retention — O-ring system
• Weight — 700g per wheel
• Includes — 4 wheels + O-rings; bearings sold separately

Bearings not included. Pick up a set of high-performance bearings here.