Just get a topstone or CAADX or summin. You probably won’t find anything “vintage” that will do what you’re after and will do it poorly if it does.
This. I thought about adapting something from a previous era before but it just doesn’t work as well as the purpose designed bikes coming out now. Despite what you think of the trend/marketing/blah, these bikes are really good at the job in hand.
@snoops started
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Just get a topstone or CAADX or summin. You probably won’t find anything “vintage” that will do what you’re after and will do it poorly if it does.