The Scribe Aero Wide+ rims are far from the widest out there, but the width is enough to sit proud of 25 mm tyres and some (narrower) 28 mm tyres, too. External rim widths have grown with tyre widths. Interestingly the rim was still (marginally) wider than the Continental GP5000 28 mm tyres I installed which measured an actual 29.3 mm wide at 80 psi. In the case of these Scribe wheels, the rim width is aerodynamically at its best when fitted with a 25 mm tyre (typically closer to 28-29 mm measured on these rims). The basic goal here, commonly referred to as the 105% rule, is to have the rim exterior marginally wider than the tyre so that the wheel can control the airflow. That wide exterior profile has fast become a common trend amongst many of the latest aero rims as tyres have become wider. In the case of the tested Aero Wide+ 42s, the U-shaped rim offers a 42 mm depth, a 21 mm internal width, and reaches out to 30 mm wide on the outside. Scribe’s new Aero Wide+ wheels all share a modernly wide internal width for tyre support and volume, with an expanded exterior width for aerodynamic purposes.
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