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  1. Starting a thread to see if anyone out there has insights into wheel size selection for the standard Motocross Bike 250/450 DTX Class. It's becoming more and more popular lately go run DTX whether on actual DTX setups or even knobby class. I'm running into tons of people that are starting out because it's kinda hip and it gives an IN to racing to what many people feel that missed out on the motocross years. Also, the costs are much less then MX so MXrs are crossing over and new riders are going right in because used cheaper bikes can have good racing on tracks less then the mile. Personally, I love sliding sideways at speed and the TT is my favorite race in all of dirt riding. That being said, there's some legit setup questions especially about wheels since it's the first conversion before doing full setups with suspension. I rode a top racer's setup with 2.75" front and 3.0" rear on a 1/4 mile DT and it felt like turning a FatBoy, it stuck to the track, but wow did it turn stiff. Things that are stated from the DTX wheel builders: 19 inch are standard, local tracks often let Sumo wheels with FT tires, but AFT requires 19". AFT limits wheel size to 19 x 3.5 in maximum. No specified minimum width. All around track size suggestion is: 19" x 2.15" to 2.50" for front || 19" x 2.75" for rear Standard Flat Track Tires are 130/80-19 Front and 140/80-19 Rear On shorter tracks, thinner wheels give the tire more roundness allowing for better maneuvering while on longer tracks the wider wheel make for a more flatter tire giving more contact area for acceleration, but hinders cornering. Where things are silly on paper. The various DTX tire makers give what they say are the recommended/minimum wheel widths. It seems people don't exactly follow them. for example Shinko says min wheel width for the 130/80/19 is 3.0 and the 140/80/19 is 3.5 . I see people run them on wheels not that wide at all. for other brands: Add in here, gearing, i run my standard 13/50 MX gearing, i 4th gear on the 1/4 mile. I don't have the greatest pull on the straightaway but it is great in corners. On the TT couse, stock gearing feels perfect. I have not put my aggressive coupler on the bike yet, i'm waiting to get things setup and tweaked right before throwing a different power setting. I'm running a stock 2019 RM-Z450 for what it's worth. What are people running and or opinions on wheel widths for different track sizes? What sprocket sizes are people running on different tracks? BTW to ask, any chance of mods putting in a Flat Track/TT category since tons are running over to the sport and thy're all thumpers?
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