650b wheels for gravel and bikepacking, with a 25 mm internal width optimized for higher-volume tires. Designed to improve comfort, grip and stability on rough and uneven terrain.
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Ritchey WCS Zeta GX 650b – Gravel and adventure wheels
The Ritchey WCS Zeta GX 650b wheels are designed for gravel and adventure setups focused on comfort, control and handling of uneven terrain.
The 25 mm internal rim width works best with higher-volume tires compared to more speed-oriented 700c setups, allowing lower pressures and greater shock absorption.
Available with Shimano HG, SRAM XDR and Campagnolo N3W freehubs.
Performance and use
The WCS Zeta GX 650b are oriented towards comfort and control, especially on gravel and uneven terrain.
Compared to faster-rolling 700c setups, the 650b diameter allows the use of higher-volume tires, increasing grip, stability and shock absorption. The 25 mm internal width supports lower pressures, improving bike handling on rough surfaces and under load.
The 36-point Ratchet system ensures precise engagement even at low speeds, useful in technical sections and situations where control matters more than speed. The 28-spoke J-bend construction maintains high reliability and ease of service, even during long trips.
These wheels are designed for bikepacking, real off-road riding and routes where stability and safety matter more than outright speed.
What makes them different
25 mm internal width → ideal for higher-volume tires
Greater shock absorption → comfort over long distances
36T Ratchet system → precise engagement even at low speeds
J-bend spokes → easy to replace anywhere
Tubeless ready with tape installed → ready to ride
Available freehubs
Shimano HG
SRAM XDR
Campagnolo N3W
Compatible with the main road and gravel drivetrains.
Technical specifications
Rims
6066 alloy, tubeless ready (tape installed)
Diameter
650b
Rim depth
19 mm
External width
29 mm
Internal width
25 mm
Recommended tires
32–67 mm
Hubs
100x12 mm front / 142x12 mm rear
Engagement system
Ratchet Driver, 36 points
Freehubs
Shimano HG / SRAM XDR / Campagnolo N3W
Spokes
DT Competition double-butted
Spoke count
28 / 28
Brake interface
Centerlock
Weight
1740 g (set)
Tubeless valves
included
Compatibility and use
Ideal for:
off-road oriented gravel setups
bikepacking and off-road travel
uneven terrain and rough surfaces
medium load configurations
CTA
Looking to build a complete bike setup (cockpit, wheels and components)?
We can help you create a configuration that matches your real use.
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