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Old 07-12-13, 08:52 AM
  #1  
Shamrock
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I was at the county park last night.Going over my pre-ride check ,haven't been on this bike in 6 weeks.Two women ride over and ask to borrow a bike pump.I assist them in filling up the one bike with air.I notice she is riding on only 10 psi in the front tire.So I ask how much psi do you want me to inflate .Dead silence.Ok I get it she has no idea.I look at the tire and inflate to 85psi.Rear tire has 10 psi.I inflate again to 85psi As I remove the pump nozzle ,BOOM! Why me?
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Old 07-12-13, 08:54 AM
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Old 07-12-13, 09:10 AM
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You did have 2 extra tubes that size, right??
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Old 07-12-13, 09:20 AM
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Good illustration of the dangers of helping. What happened next?
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Old 07-12-13, 10:51 AM
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Originally Posted by TromboneAl View Post
Good illustration of the dangers of helping. What happened next?
Pretty un eventful.I said I was really sorry the tube blew and offered them a ride home but they had a mini van at the park.Strange thing the woman who needed air in her tires crashed in that very same park last summer.I was right behind her and helped her up.I don't remember her but I never forget a bicycle.It was a gold Denali,mountainbike style.Big box store bike.
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Old 07-12-13, 11:41 AM
  #6  
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Originally Posted by Shamrock View Post
..........Why me?
Because you didn't read the sidewall of the tire??
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Old 07-12-13, 11:50 AM
  #7  
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WHOAAAAAAAA!!

hoodathunk THAT would happen?

still, bbs bikes come with paper thin (made even thinner) tubes. like a used car's tires- just good enough to get it off the lot.

the good news is they'll never ask you again! ('there's the guy that blew up my bike! stay away from him!')

those are jersey girls. you're very lucky to escape unscathed. my mom and her 2 sisters were jersey girls. i still ache...

i'm liking to die,here....

Last edited by ka0use; 07-12-13 at 12:01 PM.
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Old 07-12-13, 12:26 PM
  #8  
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Were they hot?
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Old 07-12-13, 01:19 PM
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Originally Posted by Shamrock View Post
Ok I get it she has no idea.
I look at the tire and inflate to 85psi.
Rear tire has 10 psi.I inflate again to 85psi

As I remove the pump nozzle ,BOOM! Why me?
Hi,

Because what is says on the tyre maximum is often not relevant, riding
at low pressures damages and weakens the tyre sidewalls, and 85 psi is
simply ridiculously high for any typical MTB tyre fitted to any typical MTB.

Often MTB bikes have skinny rims compared to the tyres and the maximum
is never sensibly applicable. Optimum pressures depend on tyre style, rider
weight, tyre width and the typical surface to be ridden, they are much lower.

I would have pumped them up to being sensibly hard enough, not a number.

rgds, sreten.

85 psi is ~ applicable to an average weight person on
25mm road tyres. Say 90psi rear and 80 psi front.

Last edited by sreten; 07-12-13 at 01:42 PM.
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Old 07-12-13, 01:21 PM
  #10  
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Mountain bike tire pressures tend to be in the 30-50 lb range.
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Old 07-12-13, 01:31 PM
  #11  
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No good deed goes unpunished...nuff said...
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Old 07-12-13, 01:34 PM
  #12  
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You should of asked their weight first and filled to the correct pressure according to the tire size and weight I would of loved the look when you asked how much do you weigh
My MB I run 40 psi 85 is quite hi for a MB tire.
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Old 07-12-13, 02:58 PM
  #13  
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In my youth, I did a lot of scuba diving. After leading a dive I brought a bunch of tanks to the dive shop to fill them, and I bring them into the back and hook them up to the compressor. I had a mix of tanks which were rated for 3000 PSI, and 2250 PSI, and the regulator on the system was set to a little over 3000 PSI, so you would hook up the tanks, open the valves and then wait while they filled. You were supposed to keep an eye on the pressure gauge, and close the valves to the 2250 PSI tanks when they got to that pressure. Well there was an attractive young lady in the store, and I start chatting with her and lose track of time until I hear this loud BANG!! Sure that the pressure relief disk on one of the 2250 PSI tanks had blown, I turn off the valves to the 2250PSI tanks, but the loud hissing of air continued unabated. Looking around, I see that the fill hose to one of the 3000 PSI tanks had split lengthwise.

Why you Shamrock? - because the women were there!
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Old 07-12-13, 05:47 PM
  #14  
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Originally Posted by ka0use View Post
WHOAAAAAAAA!!

hoodathunk THAT would happen?

still, bbs bikes come with paper thin (made even thinner) tubes. like a used car's tires- just good enough to get it off the lot.

the good news is they'll never ask you again! ('there's the guy that blew up my bike! stay away from him!')

those are jersey girls. you're very lucky to escape unscathed. my mom and her 2 sisters were jersey girls. i still ache...

i'm liking to die,here....
Huh?
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Old 07-12-13, 05:56 PM
  #15  
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Originally Posted by sreten View Post
Hi,

Because what is says on the tyre maximum is often not relevant, riding
at low pressures damages and weakens the tyre sidewalls, and 85 psi is
simply ridiculously high for any typical MTB tyre fitted to any typical MTB.


Often MTB bikes have skinny rims compared to the tyres and the maximum
is never sensibly applicable. Optimum pressures depend on tyre style, rider
weight, tyre width and the typical surface to be ridden, they are much lower.

I would have pumped them up to being sensibly hard enough, not a number.

rgds, sreten.

85 psi is ~ applicable to an average weight person on
25mm road tyres. Say 90psi rear and 80 psi front.
Where does it say she was riding the bike at 10psi, for a distance long enough to damage the tyre. I've ridden tyres when they have been flat or at low pressures for up to 10km, and they have been fine later.

FWIW, the maximum pressures shown on the tyre wall are much lower than what the maximum pressure will be before failure. I would suggest that if Shamrock looked at the maximum tyre pressure before proceeding to pump it up, then it's likely it was a hybrid with 700C tyres rather than MTB tyres. I also would suggest that it was the tube that got caught between the rim and the bead of the tyre that caused the failure, not the tyre itself.
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Old 07-12-13, 07:53 PM
  #16  
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Originally Posted by on the path View Post
Because you didn't read the sidewall of the tire??
Originally Posted by Shamrock View Post
I was at the county park last night.Going over my pre-ride check ,haven't been on this bike in 6 weeks.Two women ride over and ask to borrow a bike pump.I assist them in filling up the one bike with air.I notice she is riding on only 10 psi in the front tire.So I ask how much psi do you want me to inflate .Dead silence.Ok I get it she has no idea.I look at the tire and inflate to 85psi.Rear tire has 10 psi.I inflate again to 85psi As I remove the pump nozzle ,BOOM! Why me?
...Really, on the path? Read the bold text, c'mon.....
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Old 07-12-13, 09:49 PM
  #17  
on the path
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Originally Posted by DX-MAN View Post
...Really...?
At no point did the OP suggest that he read the maximum recommended pressure for the tire, which would have been located on the sidewall. Neither did he explain why he chose the number he did. Maybe he did everything right, but so far he hasn't explained it in a way that has me convinced he did.
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Old 07-13-13, 09:31 AM
  #18  
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Originally Posted by ka0use View Post
WHOAAAAAAAA!!

hoodathunk THAT would happen?

still, bbs bikes come with paper thin (made even thinner) tubes. like a used car's tires- just good enough to get it off the lot.

the good news is they'll never ask you again! ('there's the guy that blew up my bike! stay away from him!')

those are jersey girls. you're very lucky to escape unscathed. my mom and her 2 sisters were jersey girls. i still ache...

i'm liking to die,here....
They must have been out of state visitors, Edna. A real Jersey girl would have had her tires inflated to proper psi and would have been able to change her own tire as she would have had no less than two extra tubes, a pump, and handi-wipes on board!
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Old 07-13-13, 12:49 PM
  #19  
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Originally Posted by miss kenton View Post
They must have been out of state visitors, Edna. A real Jersey girl would have had her tires inflated to proper psi and would have been able to change her own tire as she would have had no less than two extra tubes, a pump, and handi-wipes on board!
Well, maybe a girl from South Jersey. Or Central, maybe. But North Jersey? Probably stole the bike to begin with.
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Old 07-13-13, 07:13 PM
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Originally Posted by Rowan View Post
Where does it say she was riding the bike at 10psi, for a distance long enough to damage the tyre. I've ridden tyres when they have been flat or at low pressures for up to 10km, and they have been fine later.

FWIW, the maximum pressures shown on the tyre wall are much lower than what the maximum pressure will be before failure. I would suggest that if Shamrock looked at the maximum tyre pressure before proceeding to pump it up, then it's likely it was a hybrid with 700C tyres rather than MTB tyres. I also would suggest that it was the tube that got caught between the rim and the bead of the tyre that caused the failure, not the tyre itself.
Hi,

What are you arguing about ? You think someone with 10psi in each tyre
generally rides around for months at optimum pressure ? They ride around
for months at too low pressure. As for the usually meaningless maximum
tyre pressure on tyres, forget it, especially with skinny rims.

85 psi is way too high for any typical MTB tyre period - you should know that
rather that spouting utterly tedious "facts" you are interpreting cluelessly.

rgds, sreten.
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Old 07-13-13, 07:51 PM
  #21  
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Originally Posted by sreten View Post
Hi,

What are you arguing about ? You think someone with 10psi in each tyre
generally rides around for months at optimum pressure ? They ride around
for months at too low pressure. As for the usually meaningless maximum
tyre pressure on tyres, forget it, especially with skinny rims.

85 psi is way too high for any typical MTB tyre period - you should know that
rather that spouting utterly tedious "facts" you are interpreting cluelessly.

rgds, sreten.
Thanks. It's a shame you have to be offensive about it. But I bow to your superior knowledge about all things cycling.
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Old 07-13-13, 08:42 PM
  #22  
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Originally Posted by sauerwald View Post
Why you Shamrock? - because the women were there!
Yeah... you put even Steven Hawking in a room full of woman and his IQ goes down to 75!
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Old 07-13-13, 10:15 PM
  #23  
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Originally Posted by sreten View Post
Hi,
85 psi is way too high for any typical MTB tyre period
Who says it was an MTB tire? You know you can get higher pressure hybrid tires in 26", 650B and 700C these days. What is most likely is that, at a pressure below 20PSI, the tube can move inside the tire, if it moved into the space between the bead of the tire and the base of the rim, then when it was brought to full pressure, it would react just like in the original posting. It would go bang.
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