Calculate the optimal front and rear tyre pressure for your mountain bike based on rider weight, tyre width, and riding style. MTB tyres run 15-35 PSI — far lower than road — because grip and traction are more important than rolling resistance on dirt. This MTB tyre pressure calculator (also a mountain bike tyre pressure reference) gives separate front and rear recommendations for tubeless and tubed setups, covering XC, trail, enduro, and downhill riding.
Front runs lower to improve steering traction on technical terrain.
⚠ These are starting points based on Schwalbe and Maxxis MTB pressure guides. Final pressure depends on terrain, riding conditions, and personal preference. Always check tyre sidewall for maximum rated pressure.
How to adjust XC tyre pressure, enduro tyre pressure, and DH pressure from a trail baseline. Examples for 75 kg rider on 2.35".
Riding Style
Adjustment
Example (2.35", 75 kg)
Priority
XC / race
+2 to +3 PSI
26/29 PSI
Rolling speed, efficiency
Trail (all-round)
Base pressure
24/27 PSI
Balance grip + speed
Enduro
−2 to −3 PSI
22/25 PSI
Maximum grip, impact absorption
Downhill
−3 to −5 PSI
20/23 PSI
Grip at all costs
Wet / muddy
−2 to −3 PSI
22/25 PSI
Wider contact patch = more traction
Hardpack / dry
+1 to +2 PSI
25/28 PSI
Less tyre deformation needed
Loose over hard
−1 to −2 PSI
23/26 PSI
Tyre conforms to loose layer
Why MTB Tyre Pressure Is So Low
Mountain bike tyres run 15-35 PSI — less than half of road bike pressure. On dirt, grip is everything. Lower pressure allows the tyre to conform to rocks, roots, and loose surfaces, creating a larger contact patch. Higher pressure bounces over obstacles, losing traction. The trade-off: too-low pressure risks rim strikes, tyre burping (tubeless), and sluggish pedalling on climbs. Finding the sweet spot between grip and protection is what this calculator helps you do. For gravel riding, which uses narrower tyres and higher pressure, see our gravel tyre pressure calculator.
Front vs Rear MTB Pressure — Why Different Pressure Matters
On a mountain bike, the front tyre needs LOWER pressure than the rear. Front rear MTB pressure split matters: front tyre priority is cornering grip and steering precision — lower pressure increases the contact patch in turns. Rear tyre priority is traction under pedalling and braking plus protection from rim strikes — it carries more weight (55-60% of total). A good starting point: rear 2-3 PSI higher than front. On steep descents, some riders run equal or even lower rear for maximum braking grip. On an e-MTB? Extra motor and battery weight means higher pressure — use our eMTB tyre pressure calculator.
Tyre Inserts — Do They Change Pressure?
Tyre inserts (CushCore, Vittoria Air-Liner, Tannus Tubeless) allow you to run 3-5 PSI lower than without inserts. CushCore pressure setups protect the rim from impacts and prevent burping at very low pressures. If you use inserts, subtract 3-5 PSI from the calculator's recommendation. Inserts add 150-250g per wheel but enable pressures as low as 14-18 PSI for aggressive riding. Running tubeless? Calculate how much sealant you need with our tubeless sealant calculator. Proper sag and tyre pressure work together — check your suspension sag calculator.
How it works
Why MTB pressure is so much lower
MTB tyres run 18–40 PSI compared to 80–120 PSI for road bikes. Lower pressure allows the tyre to conform to rocks, roots, and uneven terrain, increasing the contact patch and improving traction. It also absorbs small impacts, reducing rider fatigue. Road tyres run high pressure to minimise rolling resistance on smooth surfaces.
The trade-off: too low and the tyre rolls sluggishly, loses cornering precision, and risks burping off the rim (tubeless) or pinch flats (tubed). Too high and traction and comfort are reduced on rough terrain.
Why tubeless allows lower pressure
Without an inner tube, there is no risk of a pinch flat, where the tube is pinched between the tyre and rim on a sharp impact. This allows tubeless riders to run 2–5 PSI lower than tubed setups, improving traction and comfort without the puncture risk.
The minimum tubeless pressure is approximately 18 PSI. Below this, the tyre can burp — momentarily unseat from the rim, releasing sealant and air. Tubeless-ready rims and tyres have a tighter bead lock to resist burping.
Why front pressure is lower than rear
On a mountain bike, approximately 40% of total weight is on the front wheel and 60% on the rear. The front tyre runs 2–4 PSI lower than the rear for two reasons: less weight means less pressure needed to support the load, and lower front pressure improves steering traction and confidence on technical terrain.
Descending, even more weight shifts to the rear. Many riders drop front pressure further when riding steep or technical descents.
Frequently asked questions
What PSI should I run on my mountain bike?
For a 75 kg rider on 2.35" tubeless trail tyres, start at approximately 24 PSI front and 27 PSI rear. XC riders go 2-3 PSI higher, enduro/DH riders go 2-3 PSI lower. See the pressure chart above for your exact weight and tyre width.
Should I run the same pressure front and rear on MTB?
No. Run 2-3 PSI more in the rear. The front tyre needs lower pressure for cornering grip. The rear carries more weight and needs higher pressure to resist rim strikes and provide pedalling traction.
How low can I go on tubeless MTB tyres?
Most riders can safely run 20-25 PSI on tubeless MTB tyres. Below 18 PSI, even tubeless tyres risk burping sealant on hard cornering or impacts. With tyre inserts (CushCore), you can go as low as 14-18 PSI.
Does tyre width affect MTB pressure?
Yes — wider tyres need lower pressure. A 2.6" tyre at 21 PSI has similar volume deformation as a 2.2" tyre at 26 PSI. Wider tyres (2.5"+) are trending in MTB because they allow lower pressure for more grip and comfort.
What PSI should I run for trail riding on tubeless tyres?
For trail riding on tubeless, most riders run 24–28 PSI rear and 22–26 PSI front. The exact value depends on your total weight (rider + bike). A 75 kg rider on a 14 kg bike (89 kg total) should start around 26 PSI rear and 24 PSI front on a 2.4" tyre, then fine-tune by feel.
Can I run MTB tyres at road bike pressures?
No. MTB tyres are designed for 18–40 PSI. Running at road bike pressures (80+ PSI) will cause a very harsh ride, reduce traction dramatically, and risk damaging the tyre carcass or rim. Always check the maximum PSI printed on the tyre sidewall.
How does tyre width affect pressure?
Wider tyres have more air volume, so less pressure achieves the same effective spring rate. A 2.6" tyre needs 1–2 PSI less than a 2.4" tyre for the same feel. This is why e-MTBs with 2.6"+ tyres often run lower pressures despite the heavier bike weight.
What is the minimum safe pressure for tubeless?
18 PSI is the generally accepted minimum for tubeless mountain bike tyres. Below this, the tyre may burp — momentarily unseat from the rim and release air. Some riders run lower on specific rims and tyres, but this requires experience and knowledge of your specific setup.
What is a pinch flat and how do I avoid it?
A pinch flat occurs when the inner tube is pinched between the tyre and rim during a sharp impact — creating two small holes, known as a snakebite puncture. It is caused by insufficient tyre pressure. Tubeless setups eliminate pinch flats. With inner tubes, maintain at least 22 PSI to avoid them on trail terrain.
Should I change pressure for wet conditions?
Many riders drop 1–2 PSI in wet conditions to increase the contact patch and improve traction on slippery roots and rocks. Conversely, muddy conditions sometimes benefit from slightly higher pressure to prevent the tyre from loading up with mud. Experiment to find what works.
How does e-MTB weight affect tyre pressure?
E-MTBs are typically 6–10 kg heavier than non-assisted bikes. This extra weight requires higher tyre pressure — usually 3–5 PSI more than an equivalent non-assisted setup. Include the full e-bike weight in the bike weight input for an accurate starting pressure.
How do I know if my pressure is too low?
Signs of too low pressure: the tyre feels sluggish and slow to respond in corners, the sidewall visibly bulges during hard cornering, you experience burping (sudden loss of air without a puncture), or the rim hits rocks and roots through the tyre. Add 2 PSI at a time until the handling feels precise without losing traction.