Procrastinator's Delight

An acquaintance who is pretty realistic about human nature suggested
that name for the two tube inner tube system. After the first tube
goes flat lazy cyclists will just pump up the other tube and ride on
it until it until it goes flat, assuming that the 2nd tube is ever
topped off at all.

Still, if you have to take a tire off, it's almost as fast and easy to
repair 2 tubes as one tube, and if you want full pressure at all
times, that's fast and easy to do on the road.


Bret Cahill

On Oct 1, 10:37*pm, Bret Cahill wrote:
An acquaintance who is pretty realistic about human nature suggested
that name for the two tube inner tube system. *After the first tube
goes flat lazy cyclists will just pump up the other tube and ride on
it until it until it goes flat, assuming that the 2nd tube is ever
topped off at all.

Still, if you have to take a tire off, it's almost as fast and easy to
repair 2 tubes as one tube, and if you want full pressure at all
times, that's fast and easy to do on the road.

Bret Cahill

I get so few flats these days that I never repair tubes, I just
replace them with new ones.

--
Simon Mason

An acquaintance who is pretty realistic about human nature suggested
that name for the two tube inner tube system. *After the first tube
goes flat lazy cyclists will just pump up the other tube and ride on
it until it until it goes flat, assuming that the 2nd tube is ever
topped off at all.

Still, if you have to take a tire off, it's almost as fast and easy to
repair 2 tubes as one tube, and if you want full pressure at all
times, that's fast and easy to do on the road.

Bret Cahill

I get so few flats these days that I never repair tubes, I just
replace them with new ones.

In Tucson you get a flat before making it out of the parking lot.
Once I took off a tube and there were, not dozens but hundreds of tiny
holes over a good part of the tube, probably from a patch of pin
cushion cacti. You can buy sew ups at the bike shops but they'll
think you're from out of town.

www.bretcahill.com

http://www.bretcahill.com/

On Oct 2, 3:30*pm, Bret Cahill wrote:


In Tucson you get a flat before making it out of the parking lot.
Once I took off a tube and there were, not dozens but hundreds of tiny
holes over a good part of the tube, probably from a patch of pin
cushion cacti. *You can buy sew ups at the bike shops but they'll
think you're from out of town.

Not really a problem around here, broken glass is the biggest threat
but a decent set of robust tyres pumped up to around 120 psi seems to
stop them penetrating the tyre.

--
Simon Mason

http://www.bretcahill.com/

If Schraeder works then Presta will be at least as good. The old
heavy wide steel rim is well suited for the job. In other words this
test won't give the most conservative results. To be sure no one will
have a catastrophic failure give me some time to drill larger holes
near the spokes, etc., and peg some curbs at low speed.

I just got around to pumping it all the way up to 85 psi. One problem
is getting the same volume or mass of air in each tube without wasting
time going back and forth.

Another is keeping the tubes positioned side by side to keep both
tubes from getting punctured by the same thorn. Later today I'll glue
both inner tubes together, side by side with the valves at the proper
angle. This really needs to be produced as a single 2 chamber 2 valve
item in concert with a rim manufacturer. This is where a patent could
have some value.

It's a little game changing. Not only are quick release skewers now
unnecessary. They are undesirable, at least on commuting bikes where
wheels get stolen.


Bret Cahill