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Rat Trap Pass Tire Installation Help

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Rat Trap Pass Tire Installation Help

Old 02-20-16, 06:54 PM
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Rat Trap Pass Tire Installation Help

I just got a set of Rat Trap Pass tires and am having trouble getting them seated evenly around the entire wheel. I've never installed folding tires before and have been at it for a few hours—I'm going insane hah. I've tried both tires on different wheels (Both meticulously trued) without any luck. Any secrets to get an even installation without high points or low points when the wheel is spinning? Or is it okay to ride with a slightly uneven install?

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Old 02-20-16, 07:12 PM
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Too high is really bad because the tyre bead is above the rim and there is only one way the tyre can go from there. ie it will blow off.

Too low means the tyre bead hasn't popped into the rim yet.

If you have some low spots you can keep putting pressure into the tyre until they snap into place.

Or, and this is better, ride them around for a little bit and hopefully the action of riding will help the tyre bead pop into place.

I have a set of wheels which are tubeless compatible, this means they have an extra little lip on the inside of the rim. The extra little lip causes no end of problems getting normal tyres to sit properly. They get caught up on the little lip which results in the occasional low spot. The best solution I found was to pressurise the tyre to slightly below the normal pressure and ride them around a bit until they popped into place.
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Old 02-20-16, 08:42 PM
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Try this:

1. Lay your tire flat on the floor.
2. Fill your inner tube with enough air to give it shape. lay it inside of your tire to give the tire shape.
3. Starting at the valve stem, work one bead onto your rim working in both directions.
5. Once the first bead is in place, start working the opposite bead onto the rim the same way but starting opposite the valve stem.
6. When it starts getting hard, go back to the point opposite the valve stem and pinch both beads in to the middle of the rim. Then grab your tire in two opposite sides and try to push it down toward the valve stem. What you are trying to do is to concentrate all of the slack in the valve stem area.
7. Keep working the tire as #6 until it the last bit pops over the rim.
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Old 02-20-16, 09:06 PM
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What kind of rims? I'm running grand bois hetres on tubeless Stan's crest rims but using tubes and have to pump them up to 60-65 psi to get the bead to seat evenly. It seats with an audible BANG. I then let out air until the tire is at appropriate riding pressure.

This may be a similar experience on regular non-tubeless compatible rims?

Edit: the bead will seat in the rim and the tire will be mounted but not even along the circumference. To fully seat everything evenly I need to pump up the pressure pretty high.
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Old 02-20-16, 09:28 PM
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Originally Posted by Spoonrobot View Post
What kind of rims?
Alex Adventurer 26".

I've heard a second layer of rim tape can help with deeper rims like these, so I might give that a try as well.

Thanks for the help so far, everyone.
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Old 02-22-16, 09:59 AM
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It sounds like the bead wells are a little too deep, and the RTP tires are a little too flexible.

A thicker or second layer of rim tape will help keep the tire bead from settling down in the well in the first place.

A light coating of soap on the tire bead during installation will help it slide up into place upon inflation.
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