The Naked Scientists

The Naked Scientists Forum

Author Topic: How are tubeless tyres prevented from leaking at the rim?  (Read 3195 times)

Offline Atomic-S

  • Hero Member
  • *****
  • Posts: 928
  • Thanked: 18 times
    • View Profile
An Internet reference indicates that tubless tire beads are affixed to the rim by means of the internal pressure. However, if that is all that is going on, I would think such a connection would be very leaky, especially if any dirt got in there. How do they keep the joint from leaking air?
« Last Edit: 04/08/2008 09:23:05 by chris »


 

lyner

  • Guest
Re: How are tubeless tyres prevented from leaking at the rim?
« Reply #1 on: 04/08/2008 09:16:30 »
There is a lip / groove around the rim and a bead around the tyre. Both are made to a high standard of flatness. The pressure pushes the sidewall against the rim and it just beds down.
Run over a kerb and you can easily distort the rim enough to spoil the seal. In marginal cases I have seen them use a 'gunge' painted on the tyre wall to help things get started.

Why not use a tube? Tubed tyres just generate more heat through friction between tube and case; cases for tubed tyres need to have a smoother finish inside, to avoid this.
 

The Naked Scientists Forum

Re: How are tubeless tyres prevented from leaking at the rim?
« Reply #1 on: 04/08/2008 09:16:30 »

 

SMF 2.0.10 | SMF © 2015, Simple Machines
SMFAds for Free Forums