To groove or not to groove. What size? This is son's final year, last year he was District Webelos 1 champ, but lost the grand championship. We have never won a District Grand Championship and this year we want it! We can't use oil, I am a much better oil racer than graphite. Graphite is so touchy, too much too little. I hate it. We get the super tough inspection each year as well, our inspection takes 3x longer because they see the fenders and start double checking everything.