Catastrophic tube failure: help identify cause
09-30-09, 12:57 PM
#26
Making a kilometer blurry
09-30-09, 01:39 PM
#27
Making a kilometer blurry
I was riding with EDR one time and had my cleat come out in a sprint. I wrenched the front so hard trying to stay upright that it popped the bead off the front rim. I didn't crash (somehow).
I've had teammates catch a pedal in a crit, come down on the rear, and pop the bead off.
10-01-09, 11:59 AM
#28
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While I don't think it would blow the bead off (unless it was already compromised by installation, as mentioned elsewhere in this thread), I personally would find 75psi in a 35mm tire unnecessarily jarring if there were any off road at all in the ride. Like you, I usually run about 60 for rides that include significant pavement, and mid 40s for rides that are mostly fireroad.
10-01-09, 01:52 PM
#29
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(x-posted to CX forum)
I was riding my CX bike to work this morning, riding it along the packed-dirt trail that parallels the asphalt MUP.
As I'm riding I hear a "thud thud thud thud thud thud BOOM" with the boom being my rear tire going flat.
here's what the tube looks like:
Any idea what could have caused this?
Tires are 700x35 Maxxis Locusts. Wheels are Soul S4.0. Tubes are Bontrager 700x35-44c
I was riding my CX bike to work this morning, riding it along the packed-dirt trail that parallels the asphalt MUP.
As I'm riding I hear a "thud thud thud thud thud thud BOOM" with the boom being my rear tire going flat.
here's what the tube looks like:
Any idea what could have caused this?
Tires are 700x35 Maxxis Locusts. Wheels are Soul S4.0. Tubes are Bontrager 700x35-44c
10-01-09, 02:25 PM
#30
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As much as noobs and others in the 41 want to say that the people in the road racing subforum are a-holes we certainly were way more helpful.
10-01-09, 04:54 PM
#31
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Diagnosis: running a crappy tire at max. psi.
75 psi is too high for a cross tire and Maxxis are known for rolling off the rim.
My guess is the pressure pushed the bead off the rim and the tube exploded.
Solution: Get better tires and use lower pressure (no need to go above 60 on a CX tire on asphalt/packed trail, 40-ish or lower for mud.
I recommend IRD Crossfire or Michelin Mud 2.
75 psi is too high for a cross tire and Maxxis are known for rolling off the rim.
My guess is the pressure pushed the bead off the rim and the tube exploded.
Solution: Get better tires and use lower pressure (no need to go above 60 on a CX tire on asphalt/packed trail, 40-ish or lower for mud.
I recommend IRD Crossfire or Michelin Mud 2.
10-01-09, 05:58 PM
#32
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You don't use use talcum powder when you install your tubes do you? If there is some talcum powder on there, the tube normally slides into place when you pump them up a lot better then if there wasn't any.
As for the tubes, weight weeine 29er MTBs will use cross tubes and stretch them out.
As for the tubes, weight weeine 29er MTBs will use cross tubes and stretch them out.
10-02-09, 07:40 AM
#33
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10-02-09, 07:41 AM
#34
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and yes, I agree with jynx that the guys on the CX forum were much more tongue-in-cheek (head-in-ass?) with their responses to my question.
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10-02-09, 10:54 AM
#35
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I ride the horse trail/connector trail every day. 75 psi is way too much for the rocky sections between reston and vienna (which I'd imagine you are riding).
So are you planning to do some cross racing?
So are you planning to do some cross racing?
10-02-09, 02:23 PM
#36
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Hi,
My additional 2 cents is that you shouldn't assume that your floor pump gauge is accurate. 75 psi on your gauge could easily be 80 psi in reality. The percent over-inflation is also higher based on the relatively low max psi rating for that tire (75 psi).
One thing that I didn't see in the responses was the suggestion to use a commuter tire and save your cyclocross tires for races. That way you will have a better rolling tire and be a little less sweaty when you are "racing" to work.
My additional 2 cents is that you shouldn't assume that your floor pump gauge is accurate. 75 psi on your gauge could easily be 80 psi in reality. The percent over-inflation is also higher based on the relatively low max psi rating for that tire (75 psi).
One thing that I didn't see in the responses was the suggestion to use a commuter tire and save your cyclocross tires for races. That way you will have a better rolling tire and be a little less sweaty when you are "racing" to work.
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Thanks.
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Visit my blog at https://cleavesblant.wordpress.com/
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Learn about our Green Dream Home at https://www.lawville.org/
