6

I ride 29 inch MTBs with 2.25 front, 2.0 rear.

I usually ride on paved road (randonneuring) and occasionally slightly unpaved road (under construction).

In the past, I ran 30psi and currently I use 40psi and it runs much faster!

How high can I go with tubeless tires? Although my tires says it can go up to 65psi (https://conti-tyres.co.uk/mtb/race-king-2-0) (I use continental race king 2.0 inch on rear, maxis ardent race 2.25 inch on front)

I think the max is for when I use tubes.
When I run tubeless, how high can I go?
Something like 80% of max specified psi?

  • Edit

I run this setup for train purposes. More resistance for training.
(But I want to know how fast I can go with this high rolling resistance setup)

I plan to use similar setup for more unpaved road in the future some thing like tour divide.

6
  • Foldable or steel-bead? Mar 29, 2022 at 10:09
  • @leftaroundabout i'm not sure there is such a thing as a tubeless tyre with a rigid bead? It's probably not technically impossible, i'm just not aware that anyone makes any
    – Andy P
    Mar 29, 2022 at 10:25
  • 1
    @AndyP No official ones, but people do successfully run wire bead tires as tubeless.
    – MaplePanda
    Mar 29, 2022 at 15:13
  • If the tire is tubeless, its rated for the pressure on the side wall when running tubeless. For non-tubeless, you already outside manufacturer recommendations, but the sidewall pressure will be fine as a tube contributes nothing to pressure containment.
    – mattnz
    Mar 29, 2022 at 20:53
  • 2
    Tubes hold the air, the tire holds the pressure. The rated pressure on tires, especially those labeled Tubeless will be how high you can go.
    – mattnz
    Mar 30, 2022 at 3:50

1 Answer 1

7

To answer the question as asked: It probably depends on your rims, for example Light Bicycle recommends a maximum pressure of 40psi for their MTB rims.

To give a more complete answer: What you are trying to achieve doesn't really give the results you are looking for. Even on a perfect surface increasing to the maximum pressure does not save that much power. Here is some rolling resistance data for a race king: Bicycle Rolling Resistance - Race King Protection

When you start to consider non perfect surfaces you find that differences become smaller. The higher pressure 'feels' faster, but can in fact be slower. Personally I can't think of any reason I'd ever want to run a race king above ~35psi. When I take my 29er on road rides I typically run around 28psi rear and 26 front for a pure road ride - if I'm taking even small diversions onto gravel I'll run lower than that.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.