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nightmare sun cr16 tire mount

Old 09-20-15, 08:04 AM
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nightmare sun cr16 tire mount

Assumed these were 26/559 as tires mounted are old japanese avocet at this size. But too different 26 tires are both not mounting, cannot even get one side mounted, tested without rim tape, etc. These are older cr16 with shimano stx hubs, measure 571 diameter outer to outer which assume is a 559. Read that these rims can be a nightmare to mount and will try some other tricks later, but even if mountable they seem like would be impossible to fix in the field.
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Old 09-20-15, 08:30 AM
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What ISO size is written on the tire sidewall - is it 559, and what width? "26 tire" does not tell us anything useful.
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Old 09-20-15, 09:40 AM
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Roll back the clock to 1988. I tried to put a Schwinn-labeled 26" tire on a Raleigh 26" rim. It wouldn't go on, and I read somewhere that Schwinn tires were "special" that way. I guess similar problems still exist.

You sound experienced, but are you sure you are dropping the bead all the way into the center of the rim? You might also try some liquid soap on the bead.

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Old 09-20-15, 10:18 AM
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There's no other standard size close to 559, so I doubt it's a mismatch. But there may be generational issues. Years ago tires and rims used a "straight-side" mounting system, where the tire was positioned by shoulders on the sides of the rim. That made the actual ID if the tire below the bead the critical dimension.

Modern tires are of the "hook edge" design, and are retained by the bead sitting below the hook in the rim. This moves the critical dimension from below the bead to above, and many modern tires have some extra rubber to the inside, that wasn't there in the past.

Even when all is right, mixing straight side and hook edge tires and rims can make for fit issues. The issue should be less important with 26x1.xx (559) tires because the design was always something of a hook edge, but if the rim profile doesn't match modern designs, you can get these issues anyway.
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Old 09-20-15, 11:08 AM
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Originally Posted by dailycommute
... measure 571 diameter outer to outer which assume is a 559. ...
571 sounds like 650c, a different size. There's no way a 559mm tire bead is going to fit on a 571 mm rim. What you want are 650c tires.
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Old 09-20-15, 11:34 AM
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Originally Posted by rhm
571 sounds like 650c, a different size. There's no way a 559mm tire bead is going to fit on a 571 mm rim. What you want are 650c tires.
That crossed my mind as well, but the OP states the 571mm diameter was "outer to outer," not bead seat diameter. And I'm not sure that Sun made any 650C rims.
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Old 09-20-15, 12:48 PM
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Originally Posted by JohnDThompson
That crossed my mind as well, but the OP states the 571mm diameter was "outer to outer," not bead seat diameter. And I'm not sure that Sun made any 650C rims.
Yeah, you're probably right. I just measured a couple 26" (559) rims, and the overall diameter is indeed something like 571 mm. Never mind!
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Old 09-20-15, 02:40 PM
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The old tire is stamped 559, it remounts without issue but probably had 20+- years to stretch out. It is narrow though, 1.25. The geax road slick is also 1.25 though, the other knobby is 1.50. I have mounted my share of tires and this makes mounting my previous hard ass rim (shimano 6400 tubeless) seem like a breeze. I did totally remove rim tape to try on one of the rims, and although it looks like a 559, it sure is acting like something larger.
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