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Front Tire falling off (GT Aggressor Pro)

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Front Tire falling off (GT Aggressor Pro)

Old 06-17-20, 12:52 PM
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bratan
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Front Tire falling off (GT Aggressor Pro)

I'm having a strange issue with my new (bought last year) GT Aggressor Pro 27.5" hard-tail bike...
I took it for a ride first time this year (rode it quite a few times on gentle trails last year). Front tire exploded with loud bang while I was STANDING at the red light (that was lucky) out of nowhere. It was inflated to around 50 psi (maximum is 60). I had a spare and CO2 infiltrator so replacing it was a breeze. I didn't find any punctures, glass or nails inside the tire... After this I rode for few hours on boardwalk and home without any issues. Next morning I added some air to it (to around 40-45 PSI). As I was riding it towards boardwalk, inner tube just jumped out of tire and tire fell off again. This happens on the almost exact spot, a little further. This time tube stayed intact tho, but I was out of CO2 cartridges so I had to call a ride home. Later I checked it, inflated and everything seems fine. I don't understand what's happening... I'm pretty sure I installed tire correctly and I did ride it after first blow out...
Can rim be defective? I did have a little accident last year when it fell of my bike rack and got dragged behind the car for few feet, but I didn't see any damage than and I rode it a lot after... I'm going to replace both rim, tire and tube just in case, but I really wanted to know why it might have happened...
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Old 06-17-20, 02:02 PM
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Is this a bike from one of several big box discount "sporting" goods store? Probably just wasn't put together properly and no telling about what was going on without pics and video of it happening.

Bikes don't come already assembled to them or real bike shops. Discount places likely don't have a very experienced person putting them together.

If this was a tubeless tire with sealant, new bike that was allowed to sit for a year before ridden, then maybe I could make up an explanation. However you say this is a tubed tire.

However despite everything you describe, you probably need to take it to a shop where they deal only in bikes and let a mechanic go over it.
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Old 06-17-20, 02:37 PM
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A tube failing with a bang but without a casing failure is usually indicative of an improperly seated tire, allowing the tube to extrude under the tire bead and pop. If it happens despite the tire being properly seated, it may be a result of a defective tire or rim, or both being just far enough off spec in opposite directions to prevent effective seating of the bead. It's hard to determine which via remote viewing; a bike shop should be able to sort it out.
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Old 06-17-20, 03:54 PM
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If you had let the tire go flat and rolled it around on the flat tire you may have unseated the bead; this may have accounted for your first blowout. Similarly, if you did not seat the tire correctly this could have caused the second failure. Since you had successfully ridden the tire and rim previously, absent damage to the tire bead or rim (which should be fairly obvious upon examination) you probably just need a new tube, correctly installed and inflated. Here is an article with a lot of good information: https://www.sheldonbrown.com/flats.html
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Old 06-17-20, 04:15 PM
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It is typically not the rim although some rims seat a tire better than others ( and in extreme cases someone tensioned the wheel so much the rim shrank). It is usually because the tire is stretched or the bead is failing. I would inspect the rim for damage and if there is none, try a replacement tire first, being sure as you air it up to make sure it is seated properly before pumping it to max. Another thing I rarely see mentioned is the use of tire talc and that makes a big difference in pinched flats and even flats in general. Lining the tire lightly with tire talc allows the tube to settle and seat into the tire correctly and in pinch,puncture or rolling situations allows it to move separately from the tire.
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Old 06-19-20, 12:10 PM
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Thanks guys! I still can't figure what cause first blow out, but for second one I'm leaning towards issue with tube... I will try new tube and tire first, as I realized rims are really expensive and I just don't see any physical damage other than tiny scuffs at the edge...

Originally Posted by Iride01 View Post
Is this a bike from one of several big box discount "sporting" goods store? Probably just wasn't put together properly and no telling about what was going on without pics and video of it happening.

Bikes don't come already assembled to them or real bike shops. Discount places likely don't have a very experienced person putting them together.

If this was a tubeless tire with sealant, new bike that was allowed to sit for a year before ridden, then maybe I could make up an explanation. However you say this is a tubed tire.

However despite everything you describe, you probably need to take it to a shop where they deal only in bikes and let a mechanic go over it.
You guess correctly, I bough this in Sports Store. I don't really see how it being assembled improperly could've caused the issue I describe, especially considering that I was riding it whole summer prior to that... Bike shops are closed right now due to pandemic, so that's not an option.
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