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eMTB Tyre Pressure Calculator

Tyre pressure optimised for electric mountain bikes. Accounts for motor and battery weight (up to 32 kg) and E-rated tyre casings.

Regular MTB? MTB Tyre Pressure → · Tubeless Sealant Calculator →

Inputs

Full eMTB weight with battery · Regular MTB = 10–14 kg · eMTB = 20–32 kg

E-rated tyres have reinforced casings for eMTB loads

Total system: 104 kg (rider + bike)

Recommended Pressure
front tyre
25PSI
1.72 bar
rear tyre
29PSI
2.00 bar
Front runs lower — eMTB weight distribution ~42% front / 58% rear.
⚠ Starting pressures based on Schwalbe eMTB and Maxxis E-rated tyre guidelines. Final pressure depends on terrain, conditions and personal preference. Always check tyre sidewall for maximum rated pressure.

Sources: Schwalbe eMTB Pressure Guide · Maxxis E-rated Tyre Guide · Continental eMTB recommendations

How it works

eMTBs need higher tyre pressure than regular MTBs

Electric mountain bikes weigh 20–32 kg, compared to 10–14 kg for a regular MTB. This extra weight — from the motor, battery and reinforced frame — directly increases tyre load, requiring higher pressure to prevent rim strikes, pinch flats and tyre deformation on impacts.

Why the rear needs more pressure

eMTB motors are typically mid-drive or rear-mounted, shifting weight rearward. Weight distribution is roughly 42% front / 58% rear, compared to 40/60 on a regular MTB. The rear tyre carries proportionally more load and runs 4–5 PSI more than the front — wider than the 2–4 PSI gap on regular MTBs.

E-rated tyres

E-rated tyres (e.g. Schwalbe Magic Mary Evolution, Maxxis Assegai EXO+, Continental Kryptotal) have reinforced casings rated for higher centrifugal forces at the speeds eMTBs can reach. Standard MTB tyres are not designed for these loads. Running standard tyres adds 2 PSI to the recommendation and reduces safety margins.

  • Never use regular MTB pressures on a loaded eMTB
  • Include the full bike weight (with battery) in the calculator
  • Check the E-rating on your tyre sidewall

Frequently asked questions

Why is eMTB tyre pressure different from regular MTB?

Electric mountain bikes weigh 20–32 kg, compared to 10–14 kg for regular MTBs. The extra weight from motor and battery requires 3–6 PSI more pressure to support the load and prevent rim strikes. The motor's rear-heavy placement also shifts the front/rear pressure split slightly toward the rear.

What are E-rated tyres and do I need them?

E-rated tyres have reinforced casings rated for the higher loads and speeds of electric mountain bikes. Examples include Schwalbe Magic Mary Evolution, Maxxis Assegai EXO+, and Continental Kryptotal. Standard MTB tyres are not designed for eMTB loads and may fail at higher speeds. E-rated tyres are strongly recommended.

What PSI should I run on my eMTB?

For a typical 80 kg rider on a 24 kg eMTB (104 kg total) running 2.4" E-rated tubeless tyres on trail, expect around 24–26 PSI front and 28–30 PSI rear. Wider tyres (2.6"+) allow 2–3 PSI less. Check the tyre sidewall for maximum rated pressure.

Is tubeless essential for eMTBs?

Tubeless is strongly recommended. The heavier bike creates more force on impacts, making pinch flats more likely with inner tubes. Tubeless eliminates pinch flats and allows 3–4 PSI lower pressure. The sealant self-repairs small punctures — important given that an eMTB is heavy to carry out of the trail.

How often should I check eMTB tyre pressure?

Before every ride. The heavier loads on an eMTB cause faster pressure drop than a regular MTB — tyres can lose 1–2 PSI overnight. Use a quality gauge, not the gauge built into a track pump, which is often inaccurate at low MTB pressures.

Can I run the same tyre pressure front and rear on an eMTB?

No. The front tyre carries less load and needs lower pressure for steering traction. The rear tyre carries more weight (especially with a mid or rear motor) and needs more pressure to avoid rim strikes. Running equal pressure front and rear will result in a front that is too hard — losing grip — or a rear that is too soft — risking damage.