A flat tyre comes always inconvenient.That is why Jo Beau offers vulcanised wheels for his B13-90 stumpgrinder. Same size as the original pneumatic tyre, same profile and ball bearing, but leak-proof!Your security? No more punctures in your tyres. From now on, your tyres are resistant to sharp objects such as nails, bush thorns, etc. In this way you protect yourself against annoying moments during your work.