How long does a Sparx machine last?
How long does a Grinding Ring last? A Grinding Ring (Radius Ring or FIRE Ring) will last for 320 cycles. If you’re freshening up your blades after every skate, you’ll get 50-60 sharpenings (or even more!) per ring and if you’re sharpening your skates after every 5-6 hours of ice time, you’ll get about 40 sharpenings.