Joined: Feb 2012
Posts: 19,289
Likes: 5,382
From: Rochester, NY
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
Your dad's dad did. What do you think "gravel" bike s are? They started out as common road bikes and riders did changes that seemed to suit their riding better. Don't get too caught up in terms.
A big aspect of classic road bikes is their, often, lack of tire clearances to allow wide/knobby tires to fit. In this respect the common road bikes of the 1970s make for better conversions as they typically could fit a wider than 25mm tire with ample mud clearance still. How much tire clearance does your bike have? Andy
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AndrewRStewart