Gravel bike wheels

An internal width of 21 to 25 mm is the standard for modern gravel wheels. The internal width determines the optimal tyre profile: a 21 mm rim is suitable for tyres from 35 to 42 mm, whilst a 23–25 mm rim is ideal for tyres from 40 to 50 mm and above. ETRTO standards (2020) recommend that the internal width should be 0.55 to 0.60 times the tyre width. In practice, 23 mm (internal) gravel rims are the most versatile standard on the market for 40 mm tyres, which are the most common. Rims that are too narrow cause the tyre sidewall to bulge, compromising handling.

No, it is not mandatory, but tubeless is strongly recommended to avoid pinch punctures. On gravel, uneven terrain (stones, roots, ruts) exposes riders to snake bites (punctures caused by the inner tube being pinched between the rim and an obstacle) at a much higher rate than on the road. Tubeless tyres eliminate this risk and allow you to ride at lower pressures (2.0 to 3.0 bar) to improve comfort, grip and shock absorption. The sealant automatically seals small punctures. The only drawback is that the initial fitting is more fiddly (requires a compressor or a reservoir pump) and the sealant level needs to be checked regularly (roughly every 6 months).

Aluminium is the sensible choice for the vast majority of gravel riders; carbon is justified for performance and weight. Aluminium gravel wheels (DT Swiss GR 1600, Fulcrum Rapid Red 3) offer robustness, ease of repair in the event of damage (an aluminium rim can be straightened, a carbon one cannot), and a price that is 2 to 4 times lower. For bikepacking or technical terrain, aluminium is recommended. Carbon wheels (DT Swiss GRC 1400, Hunt Gravel Carbon) offer a weight saving of 200 to 500 g, greater lateral stiffness and better damping of high-frequency vibrations. They are justified for gravel competitions or cyclists seeking maximum lightness on fast circuits.

Check the four criteria: wheel diameter (700c or 650b), axle standard (12×100/142 mm thru-axle or quick-release), disc standard (6-bolt or Centerlock) and maximum tyre clearance.The thru-axle standard is universal on modern gravel bikes: 12×100 mm at the front, 12×142 mm at the rear. The traditional quick-release (QR) is reserved for older models. The disc brake standard is the second criterion: most hubs are either 6-bolt (IS2000) or Centerlock (Shimano). Adapters are available but add weight. Finally, the maximum tyre clearance is specified in the frame or fork specifications.

A low profile of 25 to 35 mm is the standard for gravel; above 40 mm, aerodynamics offer little benefit and comfort is compromised. High-profile rims are stiff (which is good for responsiveness) but absorb vibrations less effectively. On gravel, where uneven terrain causes a lot of jolts, a low-profile rim (25–30 mm) offers greater comfort and better versatility. Moderate-profile rims (35–40 mm) are a good compromise for competitive gravel riding on varied terrain. The rim profile has little influence on performance on gravel or trails, where air resistance is negligible compared to rolling resistance.

Yes, if the axle and brake standards are compatible, but road wheels are generally too narrow for gravel tyres. A standard road wheel has an internal rim width of 17 to 19 mm, optimised for tyres of 25 to 32 mm. Fitting 38–42 mm gravel tyres to a 17 mm internal rim results in an unstable, sub-optimal balloon profile. Furthermore, some carbon road wheels are not approved for tyres wider than 32 mm. On the other hand, for mixed-terrain events where you want to ride faster on the tarmac sections, fitting 32–35 mm tyres to wide road wheels is a valid option.

Yes, but check that the freehub body is suitable. Shimano 12-speed gravel wheels use a Microspline body (minimum 10-tooth sprocket). SRAM 12-speed gravel wheels use an XDR body (the road version of the MTB XDR). These two standards are not interchangeable. However, some high-end wheels (DT Swiss, Roval, Mavic) offer interchangeable bodies: a single hub can accommodate several types of body depending on the drivetrain. Before making a purchase, check that the freehub body offered is compatible with the groupset fitted to the bike.

28 to 32 spokes is the gravel standard, with stainless steel or treated steel spokes for road-to-trail versatility. High-end road wheels often go down to 20–24 spokes for weight and aerodynamics. In gravel riding, the terrain puts greater strain on the spokes: 28 spokes at the front and 32 at the rear is the most common compromise between strength and lightness. Flat spokes (Sapim CX-Ray, DT Aerolite) are lighter and slightly more aerodynamic than round spokes, but more expensive. For bikepacking and gravel adventures with luggage, 32 symmetrical spokes offer the best durability. A well-laced wheel with high-quality spokes can withstand knocks and minor deformation.

Between €300 and €600 for high-quality aluminium; €900 to €2,000 and above for high-performance carbon. Aluminium wheels under €300 do exist but often feature low-end hubs and bearings that are not very durable. Between €300 and €600, the DT Swiss GR 1600, Mavic Allroad SL or Fulcrum Rapid Red 3 wheels offer serious reliability and lightness. From €900, carbon comes into play (Hunt Gravel Carbon Wide, DT Swiss GRC 1400, Roval Terra) for weight savings of 300 to 600 g and a better feel on the road. For competitive gravel racing or high-level cyclosportives, investing in a pair of carbon wheels is justified. For bikepacking and everyday adventure, aluminium is the best choice.