Heard about the knobby knife a while back. Seemed like a sound idea. Basically just a high-wattage soldering iron with a sharp blade tip. For $60, it seemed like an investment that would pay for itself pretty quickly. Ordered one and tried it yesterday. In just under an hour I had the front of each lug on the MT-16 rear and the center-side of each side lug on the M59 front. The result was nice, sharp lugs. My only concern was that it would weaken the lugs and lead to chunking.
Had a really fun trail ride with Steve M. at Beartown today. Traction felt good. For me, indistinguishable from new tires. After about 30 high-speed, rocky miles I saw no chunking. The front was still very sharp. The rear was rounded again, but not as much as before the sharpening.
Seems like this will be a good way to "tune up" used tires so that they are competition-worthy.
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