The design dimensions of the Schwalbe Pro One (TLE, Tube Type) and Schwalbe Pro One TT road bike tires are based around a nominal standard rim width of 19C, the standard for modern road bike rims (formerly 15C). This has an effect on the real tire dimensions when mounted and should be taken into account when buying tires in order to ensure trouble-free mounting and best product performance.

See also: https://www.schwalbe.com/en/reifenmasse

The optimal rim
for Schwalbe tubeless racing bike tires

For safety and performance, the tire and rim on the bicycle must be optimally matched. This applies all the more to tubeless tires. In addition to the classic hooked rims (crotched type), so-called "hookless" rims (straight side) are becoming increasingly popular in current models. Hookless" rims in particular place high demands on tubeless tires for safe operation. The Schwalbe TLR/TLE models (from model year 2020) are designed to meet these special requirements, especially in the bead core area, and are therefore fundamentally compatible.

Due to the design, the tire volume increases compared to the conventional hook rim because of the larger inner rim width. Therefore, the air pressure is lower than with normal rims. To ensure safety and optimum performance, the air pressure must be set lower than with the conventional set-up with hook rim. Regardless of the rim contour (hookless or hooked rim), Schwalbe recommends only using rims/wheels that are explicitly approved for tubeless use.