Calculate the optimal tyre pressure for your gravel bike based on rider weight, tyre width, and terrain type. Gravel tyres run significantly lower pressure than road — typically 30-60 PSI depending on width and conditions. This gravel tyre pressure calculator (also useful as a gravel pressure calculator for tubeless setups) gives separate front and rear recommendations and supports both tubeless and clincher setups. Works for tyre widths from 32mm to 50mm across smooth gravel, rough gravel, and mixed terrain.
This calculator is for reference only. Results are based on standard formulas and may not account for individual variation. Always use your own judgement when making equipment decisions.
Gravel tire pressure chart (also a gravel tyre pressure chart for UK readers) with gravel pressure by weight. Separate tables for tubeless and clincher gravel bike tire pressure. Tyre widths 35–45mm across rider weights 55–95 kg.
Tubeless gravel pressure (recommended)
Rider Weight
35mm F/R
38mm F/R
40mm F/R
42mm F/R
45mm F/R
55 kg / 121 lbs
38/42
35/38
32/36
30/34
28/32
65 kg / 143 lbs
42/46
38/42
36/40
34/38
32/36
75 kg / 165 lbs
46/50
42/46
40/44
38/42
35/39
85 kg / 187 lbs
50/55
46/50
44/48
42/46
39/43
95 kg / 209 lbs
55/60
50/55
48/52
46/50
43/47
Clincher gravel pressure — add 5-8 PSI vs tubeless
Rider Weight
35mm F/R
38mm F/R
40mm F/R
42mm F/R
55 kg / 121 lbs
44/48
40/44
38/42
36/40
65 kg / 143 lbs
48/52
44/48
42/46
40/44
75 kg / 165 lbs
52/56
48/52
46/50
44/48
85 kg / 187 lbs
56/61
52/56
50/54
48/52
95 kg / 209 lbs
61/66
56/61
54/58
52/56
Front/Rear PSI shown. Rear runs 4-5 PSI higher. Tubeless is strongly recommended for gravel — it allows lower pressure without pinch flats, improving grip and comfort on loose surfaces. Values for dry conditions; reduce 2-3 PSI for wet or muddy terrain.
Pressure Adjustments by Terrain Type
How to adjust gravel tyre pressure for different surfaces. Examples shown for 75 kg rider on 40mm tubeless.
Terrain
Adjustment
Example (40mm, 75 kg)
Why
Smooth gravel (fire road)
Base pressure
40/44 PSI
Firm surface, minimal loose stones
Rough gravel (chunky rock)
−3 to −5 PSI
36/40 PSI
More grip needed, absorb impacts
Mixed (gravel + road)
+2 to +3 PSI
42/47 PSI
Compromise — lower rolling resistance on tarmac
Mud / wet
−2 to −3 PSI
37/41 PSI
Wider contact patch = more traction
Sand / deep gravel
−5 to −8 PSI
33/37 PSI
Float over loose surface
Why Gravel Pressure Is Lower Than Road
Road bikes run 70-100+ PSI on smooth tarmac. Gravel bikes run 30-55 PSI on loose, uneven surfaces. The reason: lower pressure allows the tyre to deform around obstacles (stones, roots, ruts) instead of bouncing over them. This means better grip, less fatigue, and actually faster speeds on rough surfaces. The "harder is faster" rule from road cycling does NOT apply to gravel — over-inflation on gravel makes the bike unpredictable, uncomfortable, and slower. For road sections of your gravel route, see our road tyre pressure calculator.
Tubeless vs Clincher for Gravel
Tubeless gravel pressure is almost universal in gravel cycling because it allows 5-10 PSI lower pressure without risk of pinch flats. At 35-40 PSI, an inner tube would pinch between tyre and rim on sharp impacts — tubeless eliminates this. Sealant also plugs small punctures from thorns and sharp stones automatically. If you're still running clincher on gravel, tubeless conversion is the single biggest upgrade you can make. Running tubeless? Get the right sealant amount with our tubeless sealant calculator.
How to Find Your Ideal Gravel Pressure
Start with the calculator's recommendation and adjust through experimentation. On a typical gravel ride: begin at the suggested pressure, then pay attention to these signals. Too high: bike feels harsh, bounces off loose stones, rear wheel skips in corners. Too low: tyres feel sluggish on tarmac sections, rim strikes on sharp rocks, tyre squirms in fast corners. The sweet spot is where the bike feels planted and confident through loose sections without feeling draggy on firm surfaces. Riding an e-gravel bike? Extra weight matters — check our eMTB tyre pressure calculator. For full MTB trails, lower pressures are needed — use our MTB tyre pressure calculator.
How it works
Gravel Runs 30–50% Lower Than Road
Gravel tyre pressure is significantly lower than road pressure for the same rider and tyre width. Lower pressure increases the tyre contact patch, improving grip on loose and uneven surfaces. On gravel, traction matters more than minimising rolling resistance.
The tyre volume factor
Wider gravel tyres (40–50mm) have much more air volume than road tyres (23–28mm). This extra volume means the tyre can run lower pressures while still supporting the rider's weight: the air column is simply wider and taller.
Why pressure matters more than tread
Correct pressure deforms the tyre into loose surfaces for grip.
Too high: tyre bounces off gravel, reduced control.
Too low: squirm, wallowing, rim strike risk on rocky terrain.
On hardpack gravel, slightly higher pressure rolls faster. On loose or muddy terrain, go lower for traction.
Gravel is the Best Use Case for Tubeless
If there is one discipline where tubeless makes the biggest difference, it is gravel riding. The combination of low pressures (where pinch flat risk is highest), rough terrain, and frequent small punctures from thorns makes tubeless almost essential for serious gravel riding.
Run 20–25 PSI without issues
With a tube, going below 30 PSI on rough terrain risks pinch flats (the tube gets caught between the tyre and rim on impacts). Tubeless eliminates this risk entirely. You can safely run 20–25 PSI even on rocky trails.
Sealant handles the small stuff
Small thorns (up to 3–4mm) seal instantly as you ride.
Larger cuts need a plug, but you keep rolling to the next stop.
Check and top up sealant every 3–4 months, as it dries over time.
Even on clinchers, gravel riding in thorny terrain benefits from tyre liners or puncture-resistant tyre compounds.
Match Pressure to Surface Conditions
The ideal gravel pressure changes based on the surface you are riding. Hardpack gravel and fire roads allow higher pressures for speed. Loose gravel, mud and technical rocky terrain require lower pressures for grip and control.
Surface adjustments
Hardpack: Base pressure; prioritise rolling speed.
Mixed gravel: −3 PSI; compromise between grip and speed.
Loose gravel: −5 PSI; more contact patch for grip.
Mud: −8 PSI; maximum contact, tyre deforms into surface.
Riding style adjustments
A technical rider pushing hard into corners needs lower pressure for grip. A rider focused on speed on hardpack roads can use slightly higher pressure to reduce rolling resistance. A comfort-oriented rider benefits from lower pressure for vibration damping on long gravel routes.
Frequently asked questions
What PSI should I run on 40mm gravel tyres?
For a 75 kg rider on tubeless 40mm gravel tyres, start at approximately 40 PSI front and 44 PSI rear. On rough gravel, drop to 36/40 PSI. On mixed road/gravel, run 42/47 PSI. See the pressure chart above for your exact weight.
Should I run the same pressure front and rear on gravel?
No. Run 4-5 PSI more in the rear. On gravel, the rear tyre handles more braking and power transfer forces. Under-inflated rear = excessive tyre squirm and risk of burping (tubeless). Over-inflated front = less cornering grip on loose surfaces.
How low can I go on tubeless gravel tyres?
Most tubeless gravel tyres work well down to 28-35 PSI depending on tyre width and rider weight. Below 25 PSI, even tubeless tyres risk burping sealant at the bead on hard impacts. If you frequently need sub-30 PSI, consider wider tyres (45mm+) or inserts (CushCore, Vittoria Air-Liner).
Does tyre width affect gravel pressure?
Yes — wider tyres need lower pressure. A 45mm tyre at 35 PSI has similar volume deformation as a 35mm tyre at 46 PSI. Wider tyres give more air volume to absorb impacts. This is why gravel is trending toward wider tyres (40-50mm) — they allow lower pressure for better grip and comfort.
What tyre pressure should I use for gravel riding?
Gravel tyre pressure is significantly lower than road pressure. For a 75kg rider on 40mm gravel tyres, 35–45 PSI clincher or 23–33 PSI tubeless is a good starting range. Lower pressure increases the tyre contact patch on loose and uneven surfaces, improving traction. Use the calculator with your weight, tyre width, surface type, and tubeless setup for precise recommendations.
How much lower should gravel pressure be than road pressure?
Gravel pressure is typically 20–40% lower than road pressure for the same tyre width. A 40mm gravel tyre runs at 35–45 PSI clincher versus a 28mm road tyre at 70–85 PSI. The much lower pressure is intentional: it allows the tyre to deform around rocks and roots, improving traction and reducing impact transmission to the rider over rough surfaces.
Can I run tubeless too low on gravel?
Yes. Running tubeless pressure too low causes burping, where the tyre bead momentarily separates from the rim under hard cornering load, releasing sealant and air. The minimum safe pressure depends on rim internal width, tyre volume, and riding style. Aggressive cornering at high speed requires higher minimum pressure. A general guideline is 18–20 PSI minimum for 40mm+ gravel tyres on a rim with 21mm+ internal width.
Does riding style affect gravel tyre pressure?
Yes significantly. Fast riders on hardpack gravel can run higher pressure (closer to road values) for lower rolling resistance. Technical riders on loose or rocky terrain benefit from lower pressure for traction and comfort. Bikepacking riders carrying heavy loads need slightly higher pressure to support the extra weight. This calculator accounts for riding style: Fast, Comfort, and Technical modes adjust pressure accordingly.
What is the pinch flat risk with gravel tyres?
Pinch flats (also called snake bites) occur when the tube is pinched between the rim and an obstacle under impact. With clincher tyres, staying above 30 PSI on gravel significantly reduces this risk. Below 25 PSI with a tube is very high risk on rocky terrain. Tubeless eliminates pinch flats entirely because there is no tube to pinch, which is why tubeless is strongly recommended for technical gravel riding.
Should I use the same pressure front and rear on gravel?
No. The same 40/60 weight distribution applies on gravel as on road. The rear tyre carries more weight and should run 3–5 PSI higher than the front. Some gravel riders also run the front tyre 3–5 PSI lower than the rear specifically to improve steering feel and front traction on descents. Experiment with small adjustments (2–3 PSI at a time) to find your optimal balance.
How does surface type affect gravel pressure?
Hardpack gravel (compacted dirt roads) allows higher pressure similar to rough tarmac. Loose gravel requires lower pressure for the tyre to grip individual stones. Mud and wet terrain benefit from very low pressure to maximise contact area. Rocky technical terrain also requires lower pressure to absorb impacts. The calculator applies surface-specific adjustments automatically when you select your terrain type.
Is there a universal starting pressure for gravel tyres?
A useful starting point for most riders: take your body weight in kg and divide by 2.5 for the rear tyre in PSI, divide by 3 for the front. For an 80kg rider: rear 32 PSI, front 27 PSI with 40mm tyres. Then adjust up if you feel the tyre squirming in corners (too low) or down if the ride feels harsh and you are losing traction (too high). Always use tubeless-specific lower pressures if running tubeless.