Optimal tyre pressure for commuting on MTB tyres?

[pagheca]

Let me explain my situation:

my Trek Powerfly 7 runs a Maxxis Minion DHF 29x2.50 WT up front and a Maxxis Dissector 29x2.60 at the rear. I weigh 90 kg, and the bike itself is quite heavy, around 24 kg, plus a rack, frame bag, backpack with laptop and books, pannier, and so on (I guess I am around 130 kg).

During the week I generally use it for commuting on tarmac and gravel, so I run the pressure quite high, around 35 psi. My thinking is that less tyre deformation means less wear and a lower chance of punctures. Grip isn't a concern on urban roads and gravel tracks.

At weekends I take it out on trails, sometimes quite technical ones, and I drop the pressure down to around 18–20 psi when needed.

My question is: what pressure would you recommend for the commuting use case, with the goal of maximising tyre life and minimising puncture risk? Is 35 psi too high, too low, or about right for tyres like these given my weight and bike weight?

 

[Greg Watts]

Maybe @Greg Watts wants to say something about this topic?

Right. You've already had most of the thread answer this for you, and the consensus is actually fairly clear - so let me just give you the verdict rather than another round of "it depends."

Your situation: 90kg rider, Maxxis Minion DHF 29×2.50 tubeless, mixed terrain (asphalt/gravel/trails), eMTB (so add ~25kg of bike weight to the equation). The total system weight is what matters here, not just you.

The two-pressure question: You asked who was right - "as high as the tyre permits" vs "somewhere sensible." The answer is firmly the latter.

"Many riders assume higher pressure always rolls faster, but on real MTB trails, that's rarely true. Over-inflated tyres lose efficiency because they bounce and skip over terrain."

And @skizzian's earlier point stands - high pressure on an MTB tyre concentrates wear on the centre knobs and gives you a harsher, less efficient ride. This is especially true on eMTBs, where the motor torque is going through a soft-compound rear tyre that needs to deform slightly to transmit power cleanly.

The actual numbers for your use case: For a 90 - 100kg kitted rider on 2.4" tubeless trail tyres, a reasonable starting point is 25 - 28 PSI front and 28 - 30 PSI rear.

Your Minion is 2.50", so you can shade a touch lower - 27 rear / 24 - 25 front is where I'd put you for the mixed commute/trail use.

Run the front 2 - 3 PSI lower than the rear - the rear carries roughly 60% of total weight and needs more pressure to avoid rim damage; lower front pressure gives better cornering grip.

For road-heavy days, nudge it up 2 - 3 PSI. For volcanic rock trails, stay at that number or drop 1 PSI - the Minion's casing handles it. At 1223km with tyres still in good shape, @bmwpowere36m3 had it right: you're not doing anything catastrophically wrong. This tweak just optimises longevity and feel simultaneously.

 

[Tim1023]

I went for the second wheel set and commuting tyres on that.
BUT: you need to have:
- Wheels that match your standard wheels
- Brake discs that match
- A cassette that matches
- In my case (Levo) also the magnet holder.

This works very well for me for convenience and reduced rolling resistance, but it ain't the cheapest option. One would have to go through a lot of knobbly tyres for it to make financial sense.

So: stick to your original plan!

 

[Cygg]

35 psi is actually on the low end for tarmac/gravel, not too high. I'd bump it slightly around 38 psi rear, 33-35 front. At your weight, running too low is the bigger problem: faster knob wear, rim damage risk, more flats.

18–20 psi on trails sounds fine, just watch for rim strikes on technical stuff with that much weight.