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Pardon another noob question. On pre-flight today I noticed an unevenly worn spot on my 2.5 year old left main Goodyear (pic below). The central grooves are nearly gone at a single spot, but not entirely gone. I have mostly broken my habit of hitting the brakes too early on landing - but obviously i could do better. I checked the Goodyear tire maintenance manual on replacement criteria: https://www.goodyearaviation.com/resources/pdf/aviation_tire_care_3_2017.pdf But I'm still confused. Quoting from the manual: "Inspect treads visually and check remaining tread. Tires should be removed when tread has worn to the base of any groove at any spot, or up to 1/8 of the tire circumference." These seem like conflicting criteria. It's pretty close to the base at a single spot, but not for 1/8 the circumference. Other places in the manual emphasize fabric exposed as a criteria, which is certainly not the case here. Questions: 1. Is it cool to just keep an eye on this spot for now? 2. If so, would it be wise to replace the tire the next time it has to go in for other maintenance, with so little tread remaining, or if I'm careful can I expect much more life out of this tire? 3. Should the tire be changed urgently when the groove disappears at that one spot or only if fabric is visible?