Minimal kit needed for a turbo specific bike

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So really don’t want to keep using my expensive carbon frame on my turbo. My plan is to buy a cheap aluminium road bike frame and out the minimal stuff on it possible to keep costs down. I have a Tacx Neo 2 with ERG mode so don’t really need to change gear and don’t need a rear wheel. Would I need derailleurs if I have no need to change gear? Be really grateful if anyone has done this and could share their thoughts / setup to help decide. Many thanks.
Kids from Kilburn don’t become favourite for the Tour de France. You’re supposed to become a postman or a milkman or work in Ladbrokes
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just get something from the dump, scrub clean, use that - no need to spend any money if you don't have to.
What's your budget, I had a look on facebook marketplace and there were dozens of road/racing bikes for sale locally for <£200.