~Curious: What cause the tire has lump~
10-17-08, 05:45 PM
#1
~Curious: What cause the tire has lump~
Front tires: 215-35-19 on 19x8.5
Rear tires: 245-35-19 on 19x9.5
The tires are 2 months old.. I took a ride on the road about 40 to 60mph and I feel the front is shaking.. The steering wheel shake a little bit but nothing major shaking.. So I decided to lift up the car on the mechanical lift and look at the front/rear tires.. The front tires and rear tires look fine.. Well Im gonna take two front off and wanna feel the middle tire if there is a lump or uneven wear.. It is perfect but something catch my eye.. I saw the inner sidewall tire has a lump.. Do u know what cause the lump come from? Is the tire defect or I hit something on the road.. Keep in mind, I drive on the road and I see a pothole, speed bump and something rough condition.. I swerve the car to avoid hitting the object..
Rear tires: 245-35-19 on 19x9.5
The tires are 2 months old.. I took a ride on the road about 40 to 60mph and I feel the front is shaking.. The steering wheel shake a little bit but nothing major shaking.. So I decided to lift up the car on the mechanical lift and look at the front/rear tires.. The front tires and rear tires look fine.. Well Im gonna take two front off and wanna feel the middle tire if there is a lump or uneven wear.. It is perfect but something catch my eye.. I saw the inner sidewall tire has a lump.. Do u know what cause the lump come from? Is the tire defect or I hit something on the road.. Keep in mind, I drive on the road and I see a pothole, speed bump and something rough condition.. I swerve the car to avoid hitting the object..
10-17-08, 05:51 PM
#2
Your tire experiences 30-40 lbs of force per square inch... can you imagine how much force that is?
The tire wall usually is a wall of rubber with wire mesh running through it, but if you hit a bump hard enough to damage, crack, stress or rip the rubber side wall (whether it be inside, outside, or within the material itself), the result unbalance in the way the air pressure acts upon the side wall will cause the bubble.
The bubble means the the force is not being spread evenly across the tire and now that patch is experiencing higher strains than normal.
The tire wall usually is a wall of rubber with wire mesh running through it, but if you hit a bump hard enough to damage, crack, stress or rip the rubber side wall (whether it be inside, outside, or within the material itself), the result unbalance in the way the air pressure acts upon the side wall will cause the bubble.
The bubble means the the force is not being spread evenly across the tire and now that patch is experiencing higher strains than normal.
Last edited by mikez; 10-17-08 at 07:11 PM.
10-17-08, 07:06 PM
#4
You hit a hole, bump, or something that caused the tire to be pinched against the rim. This caused the rubber material to separate from the poly mesh. This mesh holds the shape of the tire and gives it strength. Now your tire has NO strength in that one spot and can blow out at anytime. You have to by a new tire! Thats what sucks about running streched setups. Agreed with Mikez
10-17-08, 07:41 PM
#5
Instructor
You hit a hole, bump, or something that caused the tire to be pinched against the rim. This caused the rubber material to separate from the poly mesh. This mesh holds the shape of the tire and gives it strength. Now your tire has NO strength in that one spot and can blow out at anytime. You have to by a new tire! Thats what sucks about running streched setups. Agreed with Mikez
Get it checked before it blows
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10-18-08, 07:24 AM
#9
Super Moderator
Sidewall bubbles are usually caused by potholes and impacts. Extremely low profile tires like your /35 AR are particularly vulnerable. Unless you have a road hazard warranty, be prepared to pay for a new tire. Get it taken care of immediately, as the condition is dangerous.
It's probably nothing.
10-18-08, 05:01 PM
#14
lumps on the sidewall are 99.9% always due to hitting a pothole or something else that causes a rip in the fabric sidewall of a tire... the sidewall of most tires is nothing more than 2 plies of polyester cord... it doesn't take much to damage it... then ya go and stretch the tire and overload it.... really, what do you expect?