Rim size

WTB advice

https://www.wtb.com/pages/tire-rim-fit-chart#

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. The second set of digits is the tire diameter code.

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. The second set of digits is the rim diameter code.

OPTIMAL PERFORMANCE

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

COMPATIBLE

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

NOT SUGGESTED

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

Tire 42-50

• Optimal: 19-25

• Compatible: 17-18 and 26-31

• 44-45 can go to 32

• 47 can go to 35

• 50 can go to 36

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WTB Byway: 47-584

• Optimal: 19-25

• Compatible: 17-18 and 26-35

How to Select the Perfect Rim and Tire Size - Sugar Wheel Works:  Ideally, for a 40mm tire intended for gravel roads select a 21-24 (26)mm internal rim width.

Tire Size Chart For Bicycle Rims: 24-25 internal

Rim inside width for 47 x 650b gravel tires

Tire & Rim Fit Chart – WTB

Is a 25mm rim (IW) too wide for a gravel bike? - Weight Weenies

Finding the right wheel size for your gravel bike – 700C ...