Cycling Boutique Buying Guide : Tires & Rim Size Compatibility

by Biju K on August 14, 2021

What Is It?
The WTB Tire & Rim Compatibility Chart is used to determine what tire and rim width combinations provide optimal performance and compatibility. By matching your tire section width to your rim width you can determine optimal, compatible, or not optimal fitting options to ensure the best tire & rim combination.

STEP 1: What Is Your Tire Size?

ETRTO Tire Size Designation

Tire section width is used to most accurately determine the size designation of a tire. Also commonly referred to as “casing width,” section width is expressed as the first two digits in the ETRTO size designation “XX – XXX” marked on the sidewall of every WTB tire.

STEP 2: What Is Your Rim Size?

ETRTO Rim Size Designation

Inner rim width signifies the narrowest point between the bead hooks on the walls/legs that hold a tire on the rim (all WTB rims have a bead hook, but some rim from other manufacturers do not – the measurement location is the same). All WTB rims are named according to their inner rim width (i25 means the inner rim width is 25mm), but that may not be the case with rims made by other companies. All rims, regardless of manufacturer, should be marked with their ETRTO designation of XX-XXX. The first two digits refer to the inner rim width.


Optimal Performance

Filled boxes designate compatibility while also providing optimal tire profile and performance.


Dots indicated less ideal performance, but are still within the range of compatibility.

Empty boxes designate a tire and rim pairing that is not suggested and should not be used.

The suggestions above extend beyond current ETRTO recommendations, but allow for more optimal performance. Proceed at your own risk.

(c) WTB USA - Our channel partners for anything in wheels, tires and more.

*Always consult Cycling Boutique technical support for clarifications during purchase of rims. Due to large size of shipping boxes, these might be having additional shipping charges.

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