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Araya RM-20s with 2.00 tires OK?

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Araya RM-20s with 2.00 tires OK?

Old 06-08-13, 12:01 AM
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Araya RM-20s with 2.00 tires OK?

Thanks for putting up with yet another rim/tire size question. The rims have an inner width of 19 mm. I'd like to install 2.00 Schwalbe Kojaks. At Schwalbe's website, the table showing tire/rim size compatibility seems to indicate this will work. OK, so it'll work, but is it safe? Would really like to have 2.00 Kojaks but will settle for something in 1.75 if the 2.00s are risky.

This is for my for my commuterized mid-80s mountain bike.

Last edited by caintuck; 06-08-13 at 07:11 PM.
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Old 06-08-13, 12:24 AM
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It's a little outside Sheldon's tire/rim compatibility chart, but it's conservative.

I think it'll be just fine.

I'm running 2.35" on 19 mm rims on my mountain bike without problems.
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Old 06-08-13, 01:08 AM
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Thanks for the quick reply. I'm glad it was positive. I just now ordered the Kojacks from an on-line retailer.
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Old 06-08-13, 11:55 AM
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caintuck- The biggest concerns with such a tire/rim combo will be the seating of the tire and the chance of blow off and roll off. Care taken during initial airing up to confirm the bead's seating well all the way around is a good idea (suggested for any tire/rim combo but especially for yours). Not running the tires at too low a pressure which would allow the bead to roll off under hard cornering is also something to watch for. I would reduce the max pressure by a bit (maybe 10-20%) as the tire bead won't fully engage the rim's hook. Andy.
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Old 06-08-13, 05:12 PM
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It's doable...

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Old 06-08-13, 05:38 PM
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I ride overly wide tires on my commuter, and can assure you it's OK. But there's a caviat -- The tires are prone to side flex (or roll) in cornering. It isn't noticeable at full inflation (60psi) but becomes so at lower pressure. As a matter of fact change in the cornering feel is my first indicator that I have a slow leak.

I remind you of this because you're using them for down hill, which usually implies lower pressures. Do some test riding for a while including some hard emergency turns to make sure the handling is acceptable to you.
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Old 06-08-13, 07:05 PM
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Everyone, thanks for the input and the advice, which I will follow for sure.

FBinNY, you must have me confused with another poster. I will use the 2.00 Kojaks/RM-20 rims on my mid-80s mountain bike commuter, for my 20-mile round trip commute on pavement. No down hill for me.

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Old 06-08-13, 07:11 PM
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Originally Posted by caintuck
Everyone, thanks for the input and the advice, which I will follow for sure.

FBinNY, you must have me confused with another poster. I will use the 2.00 Kojacks/RM-20 rims on my mid-80s mountain bike commuter, for my 20-mile round trip commute on pavement. No down hill for me.
Yep, I don't know where I got the DH idea from. However one more reminder. The rim stress from tire pressure, is proportional on the tire pressure X the tire width. So a 2" tire at 50psi, spreads the flanges with the same force as a 1" tire at 100psi. The rim makers allow for a range of widths and pressures, but if you're using a beyond spec wider tire, make sure you stay within a pressure range that would produce the same stress as the expected wide tire at the expected pressure, ie. a 1.5" tire at 80-90psi on your rim.
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