Re: Ti Aero gravel bike?
The biggest tires for 650c are 28mm Terry Tellus, assuming they are still made. 26" wheels, like I use, will let you fit a 35 mm rear tire. I have been able to use a 38 mm on the rear, after wearing it down a few thousand miles on the front wheel, filling the brake boss a bit, and underinflating the tire. I don't know what the fork will fit, assuming you have the original fork (and you might need to change the brake). All in all an Aero is just not a gravel bike. And nor is any rigid high racer, not even a Giro 26 on the biggest softest tires that fit, if you are going to ride even slightly rough gravel at the speeds an upright gravel bike can go at. You really need a full suspension 'bent for off pavement.