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I have a Schwalbe Marathon Plus 700x25 tyre which is very difficult to mount on my rim. The rubber has almost no flexibility. The wire make the tyre directly goes either outside the rim, or inside the edges of the walls of the rim. I can mount it though, but with damages to the edges of the tyre:

A tyre with damaged beads

and with one or two broken levers:

Destroyed levers

How to mount these tyres without damaging the beads of the tyre and without too much strength?

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The classical trick is to move the beads of the tyre into the well of the rim down to the center of the valley, so that the apparent tyre diameter become larger than the rim diameter. Then the tyre can be pressed with both hands towards the point where the lever can be finally used to insert the bead into the rim.

However, this is almost impossible with Marathon Plus tyres, which have a very strong wire and a inflexible rubber: when one spot is moved into the well of the bead, others go off, so that the diameter is never increased sufficiently.

To solve this issue, I tied several knots around the tyre with strings, so that the tyre is pressed into the rim.

A tyre with several knots

However, with a classical knot, it would not be possible to press the rubber sufficiently so that the tyre would fit into the well of the rim, because these Marathon tyres have very little flexibility. To I used a Tarbuck knot, which makes it easy to get the sufficient pressure. One knot every 3 or 4 spokes allows to get a constant pressure.

A Tarbuck knot on a Mavic rim

It is then quite easy to push both sides of the tyre towards the point where the remaining work can be done with the levers, but without excess force.

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    Having never wrestled with these tires, this is an eye-opener. I would mention that tire levers are not really good tools for mounting tires in general, and I always recommend tire jacks for balky tires. There are a few companies that make them; here's one. – Adam Rice Oct 28 at 22:14
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    Squashing the tyre's tread down is not what helps. Instead, this is compressing the bead of the tyre so it lies in the valley in the middle of the rim. The tying-down helps hold the bead down there, giving you additional tyre to get over the rim. – Criggie Oct 29 at 6:07
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    @Criggie Exactly... And it is why that it's actually easier to mount a tyre with a section near to the valve last (the 'valley' isn't obstructed by the valve that way) – Lamar Latrell Oct 29 at 6:44
  • I've had some stubborn tires that I've struggled to get mounted, but nothing that every made me consider going that far. Hokey smokes! I'll never buy a set of those makes a note. What the heck are you going to do if you get a puncture 20 miles from home, carry all that string with you? – FreeMan Oct 29 at 16:20
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With stubborn tires I have found that using two or even three levers can work. Put on the tire as much as you can by hand and insert both levers at as far apart as you can. Hold one lever stationary. Push a little bit of the bead with the other lever into the rim then let it go and slide it a bit towards the stationary lever. Push a bit more on, repeat, working your way towards the stationary lever. You may have to let off the stationary lever as you get closer. Don't try to just pop it on, you'll snap the lever.

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There are several tools especially designed to help solve the stubborn tire mount problem. The one that I've used is the Kool Tool Tire bead jack. Youtube Video describing how to use it.

With the newer Tubeless ready road tires having much tighter clearances, I have used my Tire Jack more in the last year than in the previous 15 years I've owned it.

The Crank Brothers Speedier Tire lever also works very well for mounting tires, much better than any other tire lever I've tried.

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