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Tire pressure - lesson learned.

Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

Tire pressure - lesson learned.

Old 01-02-12, 09:51 AM
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Adrianinkc
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Tire pressure - lesson learned.

So yesterday to kick the year off I decided to ride two group rides, one at 9:00am and the other at 1:00pm. I always check my pressure before every ride, and rarely have flats. (2011 2 flats 4,222 miles) So I air up my tires for the morning ride (24 miles), no problems. Went to the 2nd ride and I did not check my air pressure, since I had already topped it off a few hrs ago. Well as I'm finishing up the ride, I hit a pretty nasty pot hole and instant double flat. Checked the tubes and both snake bites, now I am a heavier guy but I didn't realize tire pressure would change so much during the day. A group of people riding were kind enough to stop and wait for me while I changed both flats.
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Old 01-02-12, 09:56 AM
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Could've also just been the pot hole. Most any tube is going to pinch flat if you just ride on over those things.
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Old 01-02-12, 09:58 AM
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Did that group of people extend their kindness and helped you fix the flat or did they merely watch and chatted among themselves?
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Old 01-02-12, 09:58 AM
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I've never had that happen, and sometimes I don't fool with my tires for three or more days.
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Old 01-02-12, 10:03 AM
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Your tire pressure should not have dropped in the course of a few hours. As stated above, a simple case of a nasty pothole.
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Old 01-02-12, 10:12 AM
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Originally Posted by DRietz View Post
Could've also just been the pot hole. Most any tube is going to pinch flat if you just ride on over those things.
Good point. Hard to miss these things when there are so many of them.

Originally Posted by Garfield Cat View Post
Did that group of people extend their kindness and helped you fix the flat or did they merely watch and chatted among themselves?
Yes they did help out, although we didn't realize both were flat till I got the first one done.

Originally Posted by rdtompki View Post
Your tire pressure should not have dropped in the course of a few hours. As stated above, a simple case of a nasty pothole.
Would hard case tires help against pot hole flats ?
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Old 01-02-12, 11:02 AM
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How do you help somebody fix a flat? I always stop to be sure they have what they need, but there isn't room for two people to work.
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Old 01-02-12, 11:06 AM
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Originally Posted by Velo Dog View Post
How do you help somebody fix a flat? I always stop to be sure they have what they need, but there isn't room for two people to work.
Easy...one rider can inflate the defective tube to find the leak. Another rider can inspect the tire for foreign objects.
The rider with the best pump can offer it. The rider with CO 2 can offer some. another rider can make sure nothing is left behind.

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Old 01-02-12, 11:07 AM
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Originally Posted by Adrianinkc View Post
Would hard case tires help against pot hole flats ?
I put a few thousand miles on some Bontrager RXL hard case tires. At one point I was riding a pair of RXL hardcases that already probably had at least 3,000 miles on them (had to borrow a wheelset from a friend for awhile). I never flatted with them. Many friends have had this identical experience using Bontrager hardcase tires. They are vary durable. Bontrager claims that the sidewalls are reinforced so as to prevent the type of pinch flat you got from the pot hole and I am inclined to believe them.

The downsides: the hard case tires are not grippy. I had my back tire "jump" about a foot leaning hard into a turn, I didn't go down but it got the adrenaline going. Even running a lower tire pressure I was uncomfortable riding conservatively in wet conditions. There's that and the tires are really heavy.

The lack of grip + the heavy weight of the tires make it more worth it for me to just run a light, grippy, less durable tire and deal with the handful of flats I get in a year. For some people the durability is worth it and those tires are very durable.
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Old 01-02-12, 11:18 AM
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just check you pressure before every ride, and keep a watchful eye open for pot holes. As for the stop to help, around here, people will just slow down and yell "got what ya need?" or "need any help?" and won't stop unless you yell help, so you got some good buds there.
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Old 01-02-12, 11:23 AM
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You hit a bad pot hole. Or you are running low tire pressure.
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Old 01-02-12, 11:46 AM
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Originally Posted by wkg View Post
I put a few thousand miles on some Bontrager RXL hard case tires. At one point I was riding a pair of RXL hardcases that already probably had at least 3,000 miles on them (had to borrow a wheelset from a friend for awhile). I never flatted with them. Many friends have had this identical experience using Bontrager hardcase tires. They are vary durable. Bontrager claims that the sidewalls are reinforced so as to prevent the type of pinch flat you got from the pot hole and I am inclined to believe them.

The downsides: the hard case tires are not grippy. I had my back tire "jump" about a foot leaning hard into a turn, I didn't go down but it got the adrenaline going. Even running a lower tire pressure I was uncomfortable riding conservatively in wet conditions. There's that and the tires are really heavy.

The lack of grip + the heavy weight of the tires make it more worth it for me to just run a light, grippy, less durable tire and deal with the handful of flats I get in a year. For some people the durability is worth it and those tires are very durable.
Ditto on the Hardcase tires from Bontrager. Excellent tire but a bit on the heavy side.
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Old 01-02-12, 12:09 PM
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if you hit a big enough pothole hard enough, you'll flat. doesn't really matter what kind of tire you have on there.

assuming you're using butyl tubes, it's really unlikely that your tire pressure dropped much in a matter of hours. mine only lose maybe a couple of PSI from one day to the next.
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Old 01-02-12, 02:07 PM
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Originally Posted by Velo Dog View Post
How do you help somebody fix a flat? I always stop to be sure they have what they need, but there isn't room for two people to work.
In this case one person could work on the front tire, someone else could work on the rear. Also, the way we help each other, one person is dealing with removing the tube, another is getting the new tube ready and blowing it up a little to get it ready for the one working on the tire. After that he will roll up the tube and clean up any trash like the valve cap or the nut. Little things make it easier and quicker for everyone.
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Old 01-02-12, 02:08 PM
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Originally Posted by wkg View Post
I put a few thousand miles on some Bontrager RXL hard case tires. At one point I was riding a pair of RXL hardcases that already probably had at least 3,000 miles on them (had to borrow a wheelset from a friend for awhile). I never flatted with them. Many friends have had this identical experience using Bontrager hardcase tires. They are vary durable. Bontrager claims that the sidewalls are reinforced so as to prevent the type of pinch flat you got from the pot hole and I am inclined to believe them.

The downsides: the hard case tires are not grippy. I had my back tire "jump" about a foot leaning hard into a turn, I didn't go down but it got the adrenaline going. Even running a lower tire pressure I was uncomfortable riding conservatively in wet conditions. There's that and the tires are really heavy.

The lack of grip + the heavy weight of the tires make it more worth it for me to just run a light, grippy, less durable tire and deal with the handful of flats I get in a year. For some people the durability is worth it and those tires are very durable.
I've used the bontrager RL hardcase before and had zero problems, I think they kinda spoiled me because I would hit everything on the road and not flat. But yeah they are heavy, 335g compared to the R3 190g which I'm using now and really like so far.
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Old 01-02-12, 06:35 PM
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This is a little off topic from the OP's post but since the conversation went to hard-case tires, I'm wondering how many of you ride or have ridden on Ultra Gatorskins? I just bought a set to replace my OEM Kenda's that have provided 3,100 miles of flat free riding on my road bike. I understand that the Gatorskins are heavy but I am more of a distance rider than a speed rider. The extra 3 oz per tire wasn't a concern when I bought them because there's no climbing in this area, except for bridges.

I haven't put them on the bike yet because after I got them, I started reading about the cornering problems. I don't ride in the rain unless I'm caught in it during a ride, so do these hard-case tires really have poor control on dry pavement or is it just on wet pavement that they tend to lose their grip? I have the 700x25's.

As for the OP's question, I usually check my tires every three or four days. I ride at 100 psi and find that after three or four days, I'm usually at 95 psi.
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Old 01-02-12, 08:18 PM
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Originally Posted by Velo Dog View Post
How do you help somebody fix a flat? I always stop to be sure they have what they need, but there isn't room for two people to work.
JFC, do I have to teach you people everything? One person fixes the flat while the others ridicule him for getting a flat, having ****ty equipment, taking too long, etc. Then when he's about a minute from completion, you all take off and leave him.
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Old 01-03-12, 12:34 AM
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I always air up my tires before a group ride. I ride some loops in my neighborhood that are 2 to 6 miles, but are never more than a quarter of a mile away from my house. When I am riding in the neighborhood, sometimes I just air up my tires every other ride.
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Old 01-03-12, 12:53 AM
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I'm sure it varies a bit from tire to tire and tube to tube, but according to the tire mfgs (and, of course, notwithstanding a puncture or defective valve) normal pressure loss of a 100 psi bicycle tire should be considerably less than 1 psi/day. Given that a typical tolerance of how closely you can hit a given target PSI when inflating a tire is +/- a few psi, I'm not sure what those of you inflating tires every ride or every day are trying to accomplish. You're about as likely to cause a net loss of pressure as an increase.

I inflate mine every week or so and don't notice any significant change in pressure between fillings.

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Old 01-03-12, 01:17 AM
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Originally Posted by Adrianinkc View Post
Checked the tubes and both snake bites, now I am a heavier guy but I didn't realize tire pressure would change so much during the day.
Unless you had a leak in both tires your tire pressure didn't change enough during the day to make a difference. It doesn't sound like this is a chronic problem for you but if you want to keep riding through potholes you could try 25s or tubeless to minimize chances of pinch flatting.
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Old 01-03-12, 01:19 AM
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Originally Posted by GP View Post
JFC, do I have to teach you people everything? One person fixes the flat while the others ridicule him for getting a flat, having ****ty equipment, taking too long, etc. Then when he's about a minute from completion, you all take off and leave him.
LOL, perfect! When the first 'did they help?' was posted, I swear this was exactly my first thought.
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Old 01-03-12, 06:01 AM
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Several things going on here.

In a group ride, how did it happen that nobody in front of you indicated that pot hole?

If they did and you were too busy hanging out with your friends to notice, then this is a self-inflicted wound. If they didn't, shame on them!

When you saw the pot hole, did you at least stand on the pedals? Did you try to bunny hop? (No, it's not just for racers.)

What's your weight, and to what pressure do you inflate your tires? I doubt that different tires would've prevented this, but more air pressure might have.
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Old 01-03-12, 06:56 AM
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bad luck.
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Old 01-03-12, 06:58 AM
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Originally Posted by gregf83 View Post
Unless you had a leak in both tires your tire pressure didn't change enough during the day to make a difference. It doesn't sound like this is a chronic problem for you but if you want to keep riding through potholes you could try 25s or tubeless to minimize chances of pinch flatting.
Good advice thanks.

Originally Posted by revchuck View Post
Several things going on here.

In a group ride, how did it happen that nobody in front of you indicated that pot hole?

If they did and you were too busy hanging out with your friends to notice, then this is a self-inflicted wound. If they didn't, shame on them!

When you saw the pot hole, did you at least stand on the pedals? Did you try to bunny hop? (No, it's not just for racers.)

What's your weight, and to what pressure do you inflate your tires? I doubt that different tires would've prevented this, but more air pressure might have.

Well we were riding through downtown and it's a minefield, most were pointed out others were not. I did not get a chance to standup on the pedals because I didn't see it in time. My weight 230 and tire pressure 110 at the start of the first ride.
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Old 01-03-12, 07:36 AM
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Originally Posted by coasting View Post
bad luck.
1+.
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