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Excentric Schwalbe Marathon Supreme ... What to do+

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Excentric Schwalbe Marathon Supreme ... What to do+

Old 04-23-10, 10:03 AM
  #1  
irpheus
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Excentric Schwalbe Marathon Supreme ... What to do+

Hi,

I have just mounted a couple of Schwalbe Marathon Supreme on a Rigida Andra rim. The rim size is 559 and the tyres are about 2" wide. Looks fine except for an excentricity that I don't seem to be able to correct - the tyres just return to their old positions.

I bought the tyres used but they look fine and are only moderately worn. Any of you have experience with this?

Best,

Jesper
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Old 04-23-10, 11:20 AM
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The bead may not be seating uniformly. Try pumping the tire up over the pressure you actually plan on riding it until it pops in place, then deflate to the pressure you want and see it the eccentricity has been eliminated.
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Old 04-23-10, 11:43 AM
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Hi & thanks. Do you know if this is normal to MTB tyres? I used to ride racing bikes but never had this issue ...

Greetings ;-)

Jesper
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Old 04-23-10, 12:15 PM
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Can't speak to whether it's normal, but i had a set of kevlar-bead (folding) MTB tires that would do this. The trick I posted worked and it got the bead nice and round and I didn't have a problem with re-installing the tire afterward (such as after a flat).

Are the tires in question folding or wire-bead? I believe the problem is more common for folding tires.
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Old 04-26-10, 02:35 AM
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Hey - tried it out and it seems to have worked on one of the tyres. So now just need to find out if it is too annoying with the other tyre or it is ok. Hmmm... I don't know if the tyres are folding by definition, however, they easily fold, så maybe they are..? They are less structurally stiff than other tyres I have come across.

Thanks again :-)

Jesper
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Old 04-26-10, 06:36 AM
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I had it happen with Scwhalbe Marathon Supreme on 20" rims, it was a very tight fit and required some wax lube and overpressure to seat properly.
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Old 04-26-10, 10:28 AM
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You might just spray some alcohol on the bead, all the way around both sided, then air the tire up, that should help pop the bead into place if the tire is tight.
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Old 05-03-10, 01:38 AM
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Hi Canopus & LeeG,

Thanks also for your inputs - I will try it out and see if I can make the tyres fit better.

Regards,

Jesper
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Old 05-03-10, 07:25 AM
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Or some soapy water on the beads to get them to slide into place.

Its possible that the tires themselves are out of round (they were used, after all), but far more likely that they are not seating properly.

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Old 05-03-10, 08:01 AM
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Any chance that the "fat" portion of the tire is at the stem? If so, deflate, push the stem in, reseat the tire, and inflate carefully, trying to hold the stem in. It will come back out, but trying to keep it in will allow the tire to seat before the stem exerts pressure on it.
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