Radium Performance® SR125
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.
Specifications
Overall rating: 5.0 / 5 from 2 reviews.
Review topics: [].
"Got the Red one's and they are really grippy. It's like urathanes disguised with pneumatics or the other way around 😅. They suck the range on my battery probably the same as pneumatics. Nonetheless they stand on the podium of my favourite wheels!"
"favorite wheels hands down"
