Broken tire bead: tire no longer fits on rim
#1
Senior Member
Thread Starter
Broken tire bead: tire no longer fits on rim
I found my rear studded tire flat the other day, when I went to repair it I found an exposed end of the wire bead sticking slightly out of the tire, I ignored it, repaired the tire and rode off. I did notice that the tire came off and on far more easily than it had in the past - it was a very difficult tire to install when I first bought it seven or so years ago.
Later that evening, the tire flatted again, this time I couldn't get the tire to even seat on the rim, it appears to be simply to big to fit. The wire end isn't sticking out anymore and there isn't an apparent break in the bead.
have seen similar issues with other tires seeming to be far too big on people bikes I've tried to repair, but never had the experience first hand and seeing the bead seemingly enlarge.
Has anyone else had similar experiences?
Later that evening, the tire flatted again, this time I couldn't get the tire to even seat on the rim, it appears to be simply to big to fit. The wire end isn't sticking out anymore and there isn't an apparent break in the bead.
have seen similar issues with other tires seeming to be far too big on people bikes I've tried to repair, but never had the experience first hand and seeing the bead seemingly enlarge.
Has anyone else had similar experiences?
Last edited by randomgear; 02-04-17 at 03:27 AM. Reason: clarifications
#2
Calamari Marionette Ph.D
#3
Senior Member
Join Date: Sep 2010
Location: Roswell, GA
Posts: 8,319
Bikes: '93 Trek 750, '92 Schwinn Crisscross, '93 Mongoose Alta
Mentioned: 30 Post(s)
Tagged: 0 Thread(s)
Quoted: 1438 Post(s)
Liked 1,092 Times
in
723 Posts
The bead wire is broken, dump the tire lest you have the tire blow off of the rim suddenly and the tube explode. Not fun if you happen to be on a fast downhill.
#5
Senior Member
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 33,656
Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 2026 Post(s)
Likes: 0
Liked 1,096 Times
in
742 Posts
The reason the wire bead end wasn't visible the second time is that the bead had expanded and pulled the exposed end back inside. That's why the tire is now too big to stay on the rim. Scrap it and replace it.
#6
Senior Member
Join Date: Oct 2015
Location: Middletown NY
Posts: 1,493
Bikes: Cannondale SuperSix EVO w Hi-Mod frame, Raleigh Tamland 1 and Giant Anthem X
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 352 Post(s)
Likes: 0
Liked 8 Times
in
6 Posts
Exactly what I was going to post. A 7 year old tire does not owe you anything and pushing your luck using it will most likely lead to a long walk home. Certainly not worth the price of a new tube and tire (yes, replace both at the same time)
#7
Senior Member
Thread Starter
Not at all too long; it's a studded tire and barely shows any wear.
That said, it seems we all agree that it's a broken bead and must be replaced. I just wish it wasn't an $85 studded tire. Ouch.
Like I wrote before, I've seen other tires with similar problems when working at neighborhood bike repairdays, but always assumed manufacturers sizing error. Now, I know better. Thanks!
That said, it seems we all agree that it's a broken bead and must be replaced. I just wish it wasn't an $85 studded tire. Ouch.
Like I wrote before, I've seen other tires with similar problems when working at neighborhood bike repairdays, but always assumed manufacturers sizing error. Now, I know better. Thanks!
#8
Senior Member
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 33,656
Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 2026 Post(s)
Likes: 0
Liked 1,096 Times
in
742 Posts
It's not just obvious wear that end a tire's useful life. Exposure to light, heat, ozone, etc. all contribute to the rubber's age hardening and eventually cracking or crazing as well as reduced grip and traction.
#9
Nigel
Join Date: Mar 2011
Location: San Jose, CA
Posts: 2,991
Bikes: 1980s and 1990s steel: CyclePro, Nishiki, Schwinn, SR, Trek........
Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
Quoted: 384 Post(s)
Likes: 0
Liked 6 Times
in
6 Posts
It is very rare for a bicycle tire to have it's tread wear be the failure mechanism. Our atmosphere is about 20% oxygen, which supports the degradation (aka oxidation, rust, corrosion, ....) of all the materials our bicycle tires are made out of. Further there are other chemicals in our atmosphere that increase the rate of degradation such as sulfur, water, hydrocarbons.
#10
Senior Member
Join Date: Mar 2008
Posts: 8,688
Mentioned: 46 Post(s)
Tagged: 0 Thread(s)
Quoted: 1074 Post(s)
Liked 295 Times
in
222 Posts
Before discarding the tire, pull some studs out and save as spares. Losing a couple each season is fairly common, so an easy, already-paid replacement source can be handy to have.
I once cut a discarded studded tire into 8" pieces and brought to a swap meet.
Wrote a sign saying "free spare studs".
Was quite popular.
Pulling all studs is quite a chore. And many would prefer not to save a full tire. But an 8" will fit anywhere, and still hold a decent number of studs.
I once cut a discarded studded tire into 8" pieces and brought to a swap meet.
Wrote a sign saying "free spare studs".
Was quite popular.
Pulling all studs is quite a chore. And many would prefer not to save a full tire. But an 8" will fit anywhere, and still hold a decent number of studs.
#12
Senior Member
Join Date: Jul 2008
Location: 25 miles northwest of Boston
Posts: 29,587
Bikes: Bottecchia Sprint, GT Timberline 29r, Marin Muirwoods 29er, Trek FX Alpha 7.0
Mentioned: 112 Post(s)
Tagged: 0 Thread(s)
Quoted: 5230 Post(s)
Liked 3,599 Times
in
2,353 Posts
#13
Senior Member
Join Date: Jul 2008
Location: 25 miles northwest of Boston
Posts: 29,587
Bikes: Bottecchia Sprint, GT Timberline 29r, Marin Muirwoods 29er, Trek FX Alpha 7.0
Mentioned: 112 Post(s)
Tagged: 0 Thread(s)
Quoted: 5230 Post(s)
Liked 3,599 Times
in
2,353 Posts
#14
Senior Member
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 33,656
Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 2026 Post(s)
Likes: 0
Liked 1,096 Times
in
742 Posts
#15
Senior Member
Join Date: Jul 2008
Location: 25 miles northwest of Boston
Posts: 29,587
Bikes: Bottecchia Sprint, GT Timberline 29r, Marin Muirwoods 29er, Trek FX Alpha 7.0
Mentioned: 112 Post(s)
Tagged: 0 Thread(s)
Quoted: 5230 Post(s)
Liked 3,599 Times
in
2,353 Posts
fixed mine once and rode it OK for a cpl miles. got off, took some pics, but as soon as I got on to ride again, BAM! fixed it again but decided to hitch a ride. thanks to this thread I know that was a good decision
Last edited by rumrunn6; 02-05-17 at 05:22 PM.
#16
Senior Member
Thread Starter
Coincidence, both of ours are Winter Marathons.
My bead stuck out only about 1/16". Before it disapeared it managed to puncture the tube again; but hey, I made it to my meeting in time, so it worked well enough.
My bead stuck out only about 1/16". Before it disapeared it managed to puncture the tube again; but hey, I made it to my meeting in time, so it worked well enough.