The AMA felt that the bikes were becoming too much like "Class A" Speedway bikes and they wanted to keep a solid difference between the two racing types. In 1968 the AMA outlawed the used of aftermarket racing frames that had no rear suspension for flat track racing (aka "Class C"). So Sonic Weld designed and built hardtail flatrack frames up to 1968. It turns out that the rigid rear end is the cat's pajamas for getting around a dirt oval ~toot sweet~.
I'm basing this bike on a racing frame that was built specifically for hard core flat track racing by a company known as "Sonic Weld", all of which were rigid frame (aka "hard tail") designs much like a Speedway bike uses. Street legal, modern brakes and tires, shouldered Akronts, vintage vibe. The Triumph below is probably pretty close to what I have in mind. So that way if you wish to skip all of that "Cats in the Cradle" crap from a 53 year old you can just roll right past post #2. I'll post a more detailed explanation of all of that in post #2. He raced flat track in the 1950s and 1960s, and he of course taught me to ride and race. This project bike is based on the very rocky relationship I had with my stepdad of 30~ years (he died in 1999). The YZ650 - Cheney Engineering rigid frame project (father/son tribute)
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