braingel

look:

https://www.instructables.com/id/ECFUTKS5NREPORTJH9/

it seems like a good idea...

Morgie

seems like it might work better with mtb tires but with the higher pressure of road tires I think it would be problematic...

Fugazi Dave

Overworked solution to a problem that already has a very simple solution.

spud

bull! patch kits weigh a metric ton dude! and no way i'm going to carry an extra tube in my bag!

Fugazi Dave

Ah, I'm sorry, the pragmatist in me must have overpowered my general senses there for a moment

spud

hows it going F!Dave?

Fugazi Dave

Crazy **** left and right, but it's getting oh so much better.

AfterThisNap

My older brother used to do that with his tandem. It makes for a really heavy rolling wheel.

curlybro

Usually when I flat it is because something sharp has worked its way into my tire. Inflating another tube into said sharp object doesn't seem like a good idea to me.

Aeroplane

Exactamundo. Also, I have a hard enough time getting tires mounted with the one tube in there, and I need that to be partially inflated. Another tube uninflated would make tube changes 4x the PITA that they already are.

mattface 

Wouldn't it be a ***** to inflate that second tube and discover you pinched it when you mounted it 7 months ago, and now you don't have a patch kit or a spare tube because you were counting on this magic solution?

lyledriver

I heard about this sometime in the early 90s at an MTB race. I always thought the pinching aspect would make it a crappy solution, and never drilled out a rim to try it for myself.

kemmer

The advantage here is that it's quicker. Remove the offending object (provided you can find it, which you usually can) and pump. Easy as pie.

Oh yeah, and there's also the remote possibility that the offending object might puncture both tires if the first tire shifted after deflating, or if the object was really big. Also, what about the case where there are actually two things in the tire, sometimes I don't notice until I'm patching or inspecting the inside of the tire. I would still carry a patch kit too, because who says you aren't going to hit a nail 5 miles down the road anyway. These situations would be pretty rare, and this trick would probably work most of the time. Still, probably more trouble than it's worth if you ask me.

TheBrick

In days gone by I would double tyre (inner tyre would have the beed removed) my BMX wheels to stop pinch puntures. It also worked well agaist other puntures as well. It was very heavy though.

dustinlikewhat

my dad does this on his mountain bikes, his reason is that he hates having crap on him. He carries a patch kit and some other assorted tools in a water bottle that has been cut in half and held together with electrical tape. that's all he carries on his bike. trying to cram a tube in a water bottle is a feat and a half. the nice thing is, lets say it does puncture both tubes, you can pull off your other wheel and take out it's extra tube. sure it's a hassle, but swaping tubes is always a hassle in the mountains.

Aeroplane

Swapping tubes is more of a hassle in the middle of the street, in my opinion. If it works for your dad, that's great. But I would have to REALLY hate wearing a camelback in order to carry that extra weight in the worst spot possible.

wearyourtruth

i can fit a tire lever and patch kit in my pocket much easier than i can bother with that mess

dustinlikewhat

because that's all you'll ever need right?...

hey, it works, if you don't like it don't use it I'm just throwing out some info.

auk

Sorry, I'm with FD, it is a solution looking for a problem that doesn't exist.

If you want to really go nuts, mount a 20c tubular tire inside your 23-25c clincher and use the tubular as the tube. This is an old trick and good way to reuse worn out tubulars that give you two sets of casings that the object has to penetrate before hitting gold. It rides like a stone, but, meh. . .

FridgeRobot

i just have one question... what happens to the valve stem of the first tube, when the second tube is inflated?

does it magically inflate arolund it, like a tree absorbing a lamp post?

12XU

Get some bombproof, flat preventative tires and you won't have to come up with silly solutions like this! Over a year without a flat (pinch or puncture) here.

InVeloVeritas

I need to write an Instructible: "How to tape a spare tube to the back of your seatpost", sheesh.
The most I've had to carry (on my person) is an inflator, some house keys, and a mini 14mm wrench. I really can't see that the risk of killing both tubes (and the rotating weight) is worth not having to pop the bead on and off in the event of a failure.

Someone should work out the acceleration penality of the extra rotating tube vs the time to change a flat over an "average flat to flat interval". Frig, the fly b0yz I ride with can have a tube swapped and inflated in under a minute, no question.

rodny71

which tires do you use?

12XU

Bontrager Race Lite Hardcases-$29.99 at your local Trek dealer (sorry internet bargain hunters). I think they're far superior to Armadillos, Gatorskins, x-brand kevlar belted tires because they're laid up with a few kevlar belt layers, reinforced sidewall and a reinforced "anti-pinch belt". I actually couldn't skid through the layers of kevlar and even after I had removed the rubber, could barely poke through it with a (very sharp) dental pick.

dustinlikewhat

I never said it would make your bike go fast.

if you get a flat, you're going to have to pull the tire off the rim atleast half way, tube goes flat, pull it out, inflate the other tube.

yes there are other options, all I'm saying is that this method works.

so please no more, "UHHHH I use dis methed, so it be bett'r den your methed, durrrrrrr..."