Originally Posted by
jsigone
most road frames should accommodate up to 28C tires w/o a problem. Those with the aero design are more limited to tire width/circumference so say that of a Cervelo S5 is limited to a 23C tire.
Many road frames will accommodate 28mm tires, but many won't. Even if the
frame has the clearance for a 28mm tire, it's often difficult or impossible to squeeze a 28mm tire between the brake pads while fully inflated. These limitations don't apply just to "aero" bikes, BTW. My completely non-aero Cervelo RS can't fit anything larger than 700x25 into the front fork. Depending on the tire brand, some 25s won't even fit!