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  1. #1
    A potato in every bite... seans_potato_business's Avatar
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    Replaced rim - now I can't pump up the tyre fully without the bead popping out

    I have a Pashley Princess Sovereign bike. The rear wheel was damaged when the panniers intersected the spokes. The shop quoted a high price (more for the rim than the labour to build the wheel). I bought one of these 1 3/8 rims which turned out to be a bad idea because now the inner tube can't be pumped up fully without the tyre beed popping out of the rim. Would a different tire be better suited to this rim, allowing me to pump it up fully?

    Incidentally, the "chrome plating" that the eBay listing claims hasn't stopped it from turning into a rusted mess.
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  2. #2
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    You haven't mixed decimal and fractional 26" rim sizes have you? They're slightly different. What size does your tire say?

  3. #3
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    Quote Originally Posted by Nerull View Post
    You haven't mixed decimal and fractional 26" rim sizes have you? They're slightly different. What size does your tire say?
    +1, look up ERTRO rim sizes and see if that may be the issue. Otherwise it's simply poor seating. If the tire is low in one area, it'll be high elsewhere and blow off. This also happens if you trap the tube under the tire where you last push it over.

    I always start with the tube inflated to shape, and end at the valve. The penultimate step is to push the valve in to draw any trapped tube clear, then pull it down to settle the tube over the tire bead. Lastly, inflate to 10psi or so, and spin the wheel to check that the reference line molded into he tire is the same height all the way around.
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  4. #4
    Quirky Grifter LesterOfPuppets's Avatar
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    I read somewhere that they come with 635mm rims. IS that for real? If so you can't use stock guvner tyres on your new wheel. Hopefully that new wheel is 622mm (700c). 27" rim would be nicer, but...
    1980ish Free Spirit Sunbird fixed * 1996 Mongoose IBOC Zero-G * 1997 KHS Comp * 1990-ish Scapin * Lemond Buenos Aires Triple

  5. #5
    Quirky Grifter LesterOfPuppets's Avatar
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    Oops. Not guvner in OP. +1 to double checking which 26" everything is. Some steel rims even of supposedly proper size just won't hold some tires' beads also.
    1980ish Free Spirit Sunbird fixed * 1996 Mongoose IBOC Zero-G * 1997 KHS Comp * 1990-ish Scapin * Lemond Buenos Aires Triple

  6. #6
    Senior Member gregjones's Avatar
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    Quote Originally Posted by LesterOfPuppets View Post
    Some steel rims even of supposedly proper size just won't hold some tires' beads also.
    I replaced the knobbies on Cheryl's MTB and matched ERTRO tire sizes to make sure that there was no size problems. The new, smooth road vs. knobby, tires wouldn't "sit" into the rim at one spot or two. I just aired them to ten or so pounds and then bounced the rim/tire starting at the valve around until I got back to the valve.

    They inflated with no problems and are still rolling fine.

  7. #7
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    The picture on Ebay may be misleading but those rims appear to not be hook-edge rims. As such, you can't inflates tires to the same pressure that you could if the rim had a hook edge. At what psi are you seeing the tire blowoff? Have you tried running the tires at just below that pressure and seeing how the bike feels?

  8. #8
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    Quote Originally Posted by joejack951 View Post
    The picture on Ebay may be misleading but those rims appear to not be hook-edge rims. As such, you can't inflates tires to the same pressure that you could if the rim had a hook edge. At what psi are you seeing the tire blowoff? Have you tried running the tires at just below that pressure and seeing how the bike feels?
    While many tires depend on a hook edge rim to hold at high pressures, not all do. Some of us over 50 were riding high pressure tires before the advent of hooked rims. IRC had/has a 90psi 32mm tire that ran and still holds fine on straight side rims.

    The key is the strength of the wire bead. If it's strong enough, it will not elongate as the tire pulls on it, and therefore won't blow off at any pressure (the tire separates from the bead before the bead blows off).

    I suspect the OP has a size mismatch or a seating problem, but don't have enough info to lean one way or the other.
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  9. #9
    A potato in every bite... seans_potato_business's Avatar
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    The tyre says 1 3/8. I took the bike and rim to a shop where they built the wheel and warned me that the tyre couldn't be fully inflated without making it bulge out of the rim. I would have thought they'd tell me if the size was mismatched? Since the bike shop presented the bike to me with this warning, I don't think that it caused by the tube being trapped.

    The Pashley website says they come with 26" wheels. Only from looking at the tyres I know that they're 1 3/8.

    It's possible to ride the bike with lower pressure but my commute times are noticeably different compared to my auxilliary bike (which I'm using because the Pashley has a puncture in the rear tyre.

    Can anyone tell me how I could go about finding a high-pressure tyre that will work on this rim? A specific brand or search term?
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  10. #10
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    Quote Originally Posted by seans_potato_business View Post
    The tyre says 1 3/8. I took the bike and rim to a shop where they built the wheel and warned me that the tyre couldn't be fully inflated without making it bulge out of the rim. I would have thought they'd tell me if the size was mismatched? Since the bike shop presented the bike to me with this warning, I don't think that it caused by the tube being trapped.

    The Pashley website says they come with 26" wheels. Only from looking at the tyres I know that they're 1 3/8.
    ....
    Can anyone tell me how I could go about finding a high-pressure tyre that will work on this rim? A specific brand or search term?
    Take a look at the ERTRO size chart, and you'll see a common cause of confusion, which may be your problem. There are two 26x1-1/8" nominal sizes. EA-3 (590mm) which is the long term British standard used on 3-speed bikes for decades, and S-6 (597) also called 26x1-1/4" which was common on Schwinn bicycles here in the USA for roughly just as long.

    Assuming your tires aren't 20 years old, they will have the ERTRO size, and maybe the EA-3 or S-6 size molded in besides the old designation. If the tire is xx-597, then there's an excellent chance the shop used an EA-3 590mm rim causing your problem. The giveaway would be if the brake shoes needed to be lowered a few millimeters. The fix is easy, get a tire (or tyre) to match the rim, or have the wheel rebuilt with the correct rim which matches the tire.

    BTW- the rim flanges beyond the seats are about 5mm, so measuring the rim edge to edge, will give you a fairly definitive answer. 600mm or so, is a 590, 607mm or so is a 597.
    Last edited by FBinNY; 10-10-13 at 05:12 PM.
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  11. #11
    we be rollin' hybridbkrdr's Avatar
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    I don't know if this will work but I once bought a couple of tires at Canadian Tire and found every time I pumped them up, the tire was popping out somewhere. So I let out some air of the tires and rolled with them with low air pressure. They stayed inside the rim until I was able to increase the air pressure. Then they were fine. Anyway, they were Kenda k-898 (nice thread on those).
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  12. #12
    A potato in every bite... seans_potato_business's Avatar
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    Okay, here is the information on the tyres:

    37 - 590 (26 x 1 3/8 - 650 x 35A) HS 3-18

    I guess this means they're the right size of tyre since it has "590" in there. The eBay listing suggests using Schwalbe Delta Cruiser tyres. Perhaps the bead on those will be stiffer/tighter?
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  13. #13
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    Quote Originally Posted by seans_potato_business View Post
    Okay, here is the information on the tyres:

    37 - 590 (26 x 1 3/8 - 650 x 35A) HS 3-18

    I guess this means they're the right size of tyre since it has "590" in there. The eBay listing suggests using Schwalbe Delta Cruiser tyres. Perhaps the bead on those will be stiffer/tighter?
    So the only mismatch possibility is if the new rims are 650B. Other than that it's some sort of a variance in sizing or tolerance.
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  14. #14
    we be rollin' hybridbkrdr's Avatar
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    Wait a minute, if it's a 650b, I read once it took a while for the new 650b manufacturers to get the tolerances in line with other manufacturers. Maybe that's a hint at what it might be?
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