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Old 12-29-12, 01:19 AM   #1
ericzamora
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Funky bulging Kenda sidewall

Building up my daughter's old/new 1972 Motobecane Nomade recently, i was looking for 27 inch tires in town and found what I thought were my only options without going online. They were $9 a tire, and the only option to get her on her new bike for the weekend, so I ventured into a bike shop I've never patronized and took a chance. Check out the bulge on the sidewall. I used my silca track floor pump to partially inflate and seat the tube by feel, then later pumped a bit more to reach about 60, maybe 70lbs and left it at that. The Kendas are rated as 90lbs max. Later that night as the wheel rested against a wall, I started hearing odd sounds...

I've since found one other local option for 27 inch tires and am installing them tonight. i plan to take the Kendas (both) back to that shop. We shall see if they will accept the return and refund the money. I'm posting this mainly for the funky bulge aspect. With the tire off I can now feel the variable thickness of the sidewall at that area and notice the incomplete stamping of the sizing numerals.



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Last edited by ericzamora; 12-29-12 at 01:21 AM. Reason: clarity!
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Old 12-29-12, 05:53 AM   #2
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I had two 27" tires blow off on the same day in my living room--one with a bang that woke me up, and the other with the air just whooshing out while I was cooking dinner. This was an old ten speed with brand new tires and tubes that I'd just bought the day before. My understanding is that the old 27" rims just don't hold modern tires very well.

In my case the tires weren't damaged, but your tire does look pretty funky.
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Old 12-29-12, 05:59 AM   #3
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Broken cords in the sidewall.

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Old 12-29-12, 06:02 AM   #4
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I had two 27" tires blow off on the same day in my living room--one with a bang that woke me up, and the other with the air just whooshing out while I was cooking dinner. This was an old ten speed with brand new tires and tubes that I'd just bought the day before. My understanding is that the old 27" rims just don't hold modern tires very well. In my case the tires weren't damaged, but your tire does look pretty funky.
You had the tubes pinched between the rim and the tire bead.
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Old 12-29-12, 06:57 AM   #5
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Getting 27s these days is getting harder and harder as the OLD 27's have been out of favor for a good while now. CHEEP 27s are partially at fault, watch for defects, and there are issues with them mating up well with old rims. I have found that putting them on, adding 5 pounds or so of pressure, then working the tire all the way around to make sure it is seated, add another 15 or 20....rotate the tire again checking both sides to make sure the bead is staying put....THEN adding air up to the running pressure. I had one blow off that I just filled up without checking....OOPS....shredded the tube, but the tire was OK.
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Old 12-29-12, 07:58 AM   #6
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Yeah, that looks like an issue with the tire. I'd take it back and they should take it back for the defect. RubberLegs has a good procedure for making sure a tire is seated and you aren't pinching the tube between the rim and the tire. I rehab a fair number of old bikes and always check how the tire is seated, similarly. I hadn't considered if it was new tires/old rims issue, though.
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Old 12-29-12, 03:20 PM   #7
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whever I install a tire, or reinflate it from being so low its loose, I put about 5 psi in it, just enough to hold the bead against the rims, then go around the whole circumference of the wheel on both sides making sure the rim seat is even. there's almost always a little ridge in the molding that should be approximately level with the edge of the rim, so I pinch and push/pull the tire til this is even all the way around on both sides. THEN I put the full pressure in the tire. as long as I remember to do this, I haven't had a tire blow off the rim in a long time, it also makes the tires roll straighter.
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Old 12-29-12, 04:05 PM   #8
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That's clearly a tire issue and not likely anything you did or could have done. The shop shouldn't give you any grief about a return.

While not exactly common, this kind of problem isn't rare either. Bike tires aren't pressure tested at the factory, so problem tires that should be rejects aren't spotted until they're mounted. If you had the shop mount the tires, you'd never have known about the problem because the shop would simply have replaced it before it got to you.

As they say in Vermont---- Compost happens.
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Old 12-29-12, 04:09 PM   #9
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Kenda sells some crap. I bought some Schwinn S6 tires and they have a wierd buldge to them. Cheap is cheap...
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Old 12-29-12, 04:17 PM   #10
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Kenda sells some crap. I bought some Schwinn S6 tires and they have a wierd buldge to them. Cheap is cheap...
That's an unfair generalization. Unless things have changed very much in the last few years, Kenda probably has the best, most consistent quality tires in their general price category. Not comparing these to high end tires, but apples to apples, you'll have trouble getting better qulaity for the buck.

BTW- I'm not a Kenda shill, I imported IRC tires for years.
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Old 12-29-12, 04:45 PM   #11
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whever I install a tire, or reinflate it from being so low its loose, I put about 5 psi in it, just enough to hold the bead against the rims, then go around the whole circumference of the wheel on both sides making sure the rim seat is even. there's almost always a little ridge in the molding that should be approximately level with the edge of the rim, so I pinch and push/pull the tire til this is even all the way around on both sides. THEN I put the full pressure in the tire. as long as I remember to do this, I haven't had a tire blow off the rim in a long time, it also makes the tires roll straighter.
That's exactly what I do after experiencing a tube pinch blowout, sounded like a cannon going off and what a waste of a good tube.
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Old 12-29-12, 04:46 PM   #12
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re someone's comment up there about old 27" rims not holding tires well.... they would have to be REALLY old 27" rims that didn't have a 'hook' in the bead. probably steel rims, were probably using tinplate spokes, and probably SHOULD have rusted away in a compost pile before the 70s were over.
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Old 12-29-12, 04:48 PM   #13
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Didn't say all the tires, but cheap is cheap. Wish if they had the option to make an obsolete tire, they made something decent.
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Old 12-29-12, 05:13 PM   #14
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Panaracer 27" tires are fantastic. Better than some of the 40-year-old crap that I've unmounted from 27" rims.
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Old 12-29-12, 07:38 PM   #15
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i kinda like kenda tires. i use them on my bicycles and motorcyles.

they last a long time, have been reliable, and periodically i can find therm at a huge discount. usually as a consequence of periodic recalls.

i'm not kidding. apparently whatever they are recalling them for hasn't or doesn't or won't affect me. maybe the recall is for things not catastrophic, if so, that's right up my alley. i don't mind a little inconvenience, now and then, if the price is right. not that i have been inconvenienced as yet.
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Old 12-30-12, 02:31 AM   #16
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i haven't mounted tires in ages. maybe 15 years, but it's like riding a bike i did like pierce outlined. a little pressure first, massaged the tire around the rim ensuring it was seated as well as i could tell, a little more air. check again, then ramped it up to about 60psi. daughter rode with me around the neighborhood one time. later that night i started hearing the sidewall crackling and i rushed over to deflate the tire as soon as i saw what was happening. by the way, i use cornstarch in the tire, coating the inside to help the tube situate itself but apparently, after countless hours of perusing forums here and elsewhere, i've read a few places that it's an urban myth of sorts and is not needed.

i must admit, my brand loyalty towards kenda has been severely compromised though i do understand kenda is a big name with better quality product for bikes and motorcycles. i should just keep in mind these were $9 tires.

i almost ordered some panaracer paselas after reading glowing reviews here but ended up buying a brand called Duro (another brand i find manufactures tires for motorcycles) from a source in town. again, cheap tires in price but i checked the wall thickness and everything looks much better in quality. i think i was suckered in by the white walls and black middle tread. they look really nice on her bike. i'm going to take it out on a test ride tomorrow.

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Old 12-30-12, 03:10 AM   #17
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How many miles did you put on that tyre with the bulge? It appears to have rubbed on something and worn off the lettering. If you didn't put that many miles on with the tyre rubbing, you may have gotten a used damaged tyre.
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Old 12-30-12, 03:15 AM   #18
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re someone's comment up there about old 27" rims not holding tires well.... they would have to be REALLY old 27" rims that didn't have a 'hook' in the bead. probably steel rims, were probably using tinplate spokes, and probably SHOULD have rusted away in a compost pile before the 70s were over.
Even with straight-edged rims like that, it's perfectly possible to keep the tyre on - people managed back then, after all. The maximum pressure is considerably lower, though.
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Old 12-30-12, 03:41 AM   #19
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i almost ordered some panaracer paselas after reading glowing reviews here but ended up buying a brand called Duro (another brand i find manufactures tires for motorcycles)

you must run some really cheap motorcycle tires. never HEARD of Duro *or* Kenda in motorcycles. when I'm riding a 100HP machine that can go 0-60 in 4 seconds, I like to have some serious rubber under me. I generally put Metzelers Z6 on my beemer. Then, I'm also a guy what likes Michelins on his car, and uses Conti/Vittoria on his bicycles

Panaracer makes good inexpensive bicycle tires, for sure. I'd pick them over CST (Chen Shen) or Kenda any day.
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Old 12-31-12, 06:29 AM   #20
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How many miles did you put on that tyre with the bulge?....
not even one mile. daughter rode it up and down the streets, maybe 6 blocks total. it's a ew tire. tread is untouched and nubbies still new.
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Old 12-31-12, 06:36 AM   #21
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you must run some really cheap motorcycle tires. never HEARD of Duro *or* Kenda in motorcycles.....
i don't run tires on motorcycles. i don't have a motorcycle i meant i found evidence that duro manufactures motorcycle tires by finding some listed as such on the internet. it wasn't a measure of their motorcycle tire quality.

and these cheap tires, which i want to be GOOD cheap tires, are for my daughter's mixte frame bike from the 70s. unfortunatey, she's only with me every other weekend and so it won't get much use. half of those wekeends i need to work.

personally, i like and use vittoria whenever i can. i just bought a pair of rubino pro slicks to eventually replace the vredensteins i have on my bianchi's clincher wheels, and used to use vittoria CX cotton casing sew-ups on my tubular rims. need to get new tires for those wheels too this spring.

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Old 12-31-12, 03:35 PM   #22
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THen I'd recommend the Panaracer Paselas, I believe they still have a 27" size, and they have that classic gumwall look that is just right on a vintage bike. The Nomad was pretty much the bottom of the line cheap gaspipe bike when I bought my Grand Record (1975)... IIRC, it went Nomad, Mirage, Gran Touring, Sprint, .... Grand Record, Le Champion, Team Champion. the last two were racing geometry, while my Grand Record is more of a touring frame, but with 531 DB throughout, and came with tubulars and partial campy NR bits (of course, I upgraded mine to all NR).
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Old 01-02-13, 10:36 AM   #23
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Didn't say all the tires, but cheap is cheap. Wish if they had the option to make an obsolete tire, they made something decent.
There are plenty of decent 27" tires http://www.biketiresdirect.com/search/27in-road-tires
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