| Author | Message | ||
     James (Jimmyg) Senior Member Username: Jimmyg Post Number: 356 Registered: 10-2002 |
I was just curious what the correct psi for reseating beads on a tire is? Thanks | ||
| Kyle Van Tassel (Kyle) Moderator Username: Kyle Post Number: 368 Registered: 11-2002 |
Alot Kyle "Blow me" | ||
| david summers (Texmoto) Member Username: Texmoto Post Number: 64 Registered: 12-2002 |
I used about 120 psi with my Powertank to reset a guy's tire in Moab. David | ||
| James (Jimmyg) Senior Member Username: Jimmyg Post Number: 357 Registered: 10-2002 |
Is 200psi too much with the stem removed? | ||
| Alex Schubow (Alex) Member Username: Alex Post Number: 47 Registered: 02-2002 |
Its going to be tough to get any air in there with the stem removed. valve core removed may work. | ||
| Rob Soetewey (Robbert) New Member Username: Robbert Post Number: 14 Registered: 01-2003 |
If you got the time and tricks you don't need a lot of pressure. Running narrow rims also helps. There's the ratchet strat trick, the 16inch moped tube with soap trick, and most spectacular is the quick start trick. The Quick start trick is potentially dangerous. The ratchet strap trick is much quicker then the the moped tube with soap trick, but if the ratchet strap trick doesn't work, the moped tube trick will do. | ||
| Peter Matusov (Pmatusov) Senior Member Username: Pmatusov Post Number: 859 Registered: 09-2002 |
James, it takes about 20 psi to reseat the bead. What's more important, you need much more airflow to be able to overcome large leakage. So what people routinely do is to increase the setting on the regulator to get more airflow. My CO2 tank regulator is set to about 150 psi, and with the valve core removed, it will seat a 35" tire. If you have a _real_ high-flow regulator, it may provide enough flow to seat a tire at only 60psi setting. However - it will be much faster if the ratchet strap or a rope is tied around the tire, more or less on centerline, to minimize leaks. peter | ||
| Reed Cotton (Reedcotton) Member Username: Reedcotton Post Number: 223 Registered: 01-2003 |
Sealing the bead is the tricky part. I think the question is "Once sealed, how much preassure does it take to fully seat the bead?" My personal favorite is the above mentioned Quick Start method, but even that may not be the all-in-one approach. Lubrication on the rim helps alot. 200 pounds of pressure should do it, (if your compressor will go that high.) but wear safety glasses and padded clothing. Putting your free finger in one of your ears may also help. A lot of things can happen, even at lower pressures. If the wheel got damaged, you could be looking (literaly) at rim failure. Tire, or rim shrapnel will not be good for you. I doubt you would need to go higher than about 120 pounds to seat it, and even that seems high. If you are on the trail, get it on the rim and sealed (holding air), then first chance get it to a tire shop, and let the pros worry about their safety. (That's what they get all that danger money for.) -Reed | ||
| Peter Matusov (Pmatusov) Senior Member Username: Pmatusov Post Number: 863 Registered: 09-2002 |
Reed, 200psi in a tire would instantly rip it apart. tire shop guys mount them all day long and it never happens; the reason being that the actual pressure inside the tire at the moment when the bead is seated is about 10 psi. You don't need any significant pressure to seat a bead, but you need a lot of volume (rather, airflow). One way to get this volume - crank up the setting on the regulator; it will push twice as much air through the same hose when pressure difference across it is 200 psi than at 100 psi. If you used a shorter hose, and a 3/8" professional grade hose (not that shiny slinky), you might get by with a 50psi setting on your regulator, and never subject yourself to dangers you describe. | ||
| John Cinquegrana (Johnc) Senior Member Username: Johnc Post Number: 513 Registered: 07-2002 |
Some starter fluid and a match....that's all it takes!!!! | ||
| Reed Cotton (Reedcotton) Member Username: Reedcotton Post Number: 228 Registered: 01-2003 |
Peter- Thanks for the clarification. Re-reading my comments, I can see where they could put someone in a real dangerous situation. I was actually trying to turn them away from that direction. I'll now go chew on my foot for a while. -Reed | ||
| James (Jimmyg) Senior Member Username: Jimmyg Post Number: 360 Registered: 10-2002 |
Excuse my ignorance, I meant valve core. The situation that I'm referring to is like this  Now with the valve core removed(assuming that is necessary), would a high psi burst be enough to get the tire sealed back on the rim if it is jacked up off the ground? I have a 20lb CO2 tank and can push 200psi but I just don't think that is needed to get the job done safely. | ||
| Kyle Van Tassel (Kyle) Moderator Username: Kyle Post Number: 369 Registered: 11-2002 |
Its more about volume then pressure if you have a wide rim. The trick that John mentions works but its not the best thing in the world to be doing if you arent familliar with it. If you have contact on both sides between the rim and the tire you should be fine with that tank.... Kyle "Blow me" | ||
| John (Jroc) Member Username: Jroc Post Number: 130 Registered: 08-2002 |
Hey John, I've heard about this starter fluid and a match thing for a while but never seen anybody actually do it! I thought it was an old wives tale, have you ever done this? Anyone??? Can you use anything besides starter fluid? Sounds VERY dangerous but in a bind good to know. | ||
| Reed Cotton (Reedcotton) Member Username: Reedcotton Post Number: 231 Registered: 01-2003 |
I have seen it done. Very spectacular, and like anything fun in life, potentially very dangerous. I had a very good friend have a can of starting fluid explode next to him. (There were no open flames involved, the can accidentally fell and shorted on the battery terminals in his boat.) He was engulfed in flame, and spent several months in a Mexican burn unit. Even after he was released from the hospital it took him a long while to recover. Like I say, it looks cool, but is potentially very dangerous. -Reed |
