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Aug
23
comment Presta valve won't let air in on a new tube
Note one important thing with Presta valves: When tightening the "nobbie" after inflating, just get it snug. The intent is to keep vibration from opening the valve -- the air pressure is sufficient to hold it shut, absent severe vibration. If you wrench it down tight you deform the rubber gasket inside the valve.
Aug
23
comment 3D printing frames?
The average 3D printer has a maximum workpiece size of about ten inches in each dimension, and it works with plastic. Some work with metal, but generally not high-strength metal. And carbon can't be 3D printed because the fibers must be properly aligned.
Aug
23
comment What is the middleground between permatube and normal tubes?
Have you tried belted tires? In my experience they reduce punctures by at least a factor of ten.
Aug
23
comment What is the purpose of greasing BB threads?
The #1 reason is so that when you torque the cups you get an accurate reading.
Aug
23
comment Presta valve won't let air in on a new tube
Putting a petroleum solvent like WD-40 on any part containing rubber is a stupid idea. Doubly so given that the valve is so close to the rim braking surfaces.
Aug
22
comment Inner tube size.
Most tubes will list a range of sizes. Eg, 700x23 through 700x28 (and also, for the same tube, 27" x 0.9 through 27" x 1.1). If not, any tube of the same diameter and within about 3mm of the same width is OK.
Aug
22
comment Handle bar height
(But it's my opinion that bike manufacturers deliver bikes with the bar set too low because that makes them look "meaner" on the salesfloor. And with the new threadless headsets it's not as easy to raise the handlebar once you have the bike in your possession.)
Aug
22
comment Handle bar height
What is comfortable for you is what's comfortable for you. Most people who complain about shoulder/neck pain as you do will benefit from any elevation of the handlebar, though it's hard to predict how much would be significant enough to be worth the effort. Plus it often the case that the bike frame is a hair too big or the stem places the bar too far forward, so the long "reach" is as much a problem as the low bar.
Aug
22
comment What is the purpose of a serial number?
I suspect that, from a manufacturer's point of view, the serial number is a bit of a PITA, but it helps them assure that the bike is really one of theirs, and when it was manufactured. Plus I suspect that many countries/states require that all new bikes sold there have serial numbers.
Aug
22
comment Training Advice for Road Cycling
One point with regard to the tires: Once there's enough pressure to prevent "snake bite" punctures, the "optimal" pressure is variable, depending on road conditions. You want high pressure on smooth roads, and lower pressure on rougher surfaces. Riding on a rough road with hard tires burns more energy than with softer tires, plus the vibration tires you sooner. But on a very smooth road soft tires cost you a little bit of energy.
Aug
22
comment Can you identify this Sachs hub?
The spacers on the axle are a bit odd-looking. That may give you a clue, or it may be that they're after-market.
Aug
22
comment Is my stopping dangerous when Idaho Stop is de facto but not legal?
@ChrisW - And, of course, the most dangerous intersection is a sidewalk crossing a driveway. Even when it's technically legal to ride on the sidewalk it's extremely dangerous to do so, both because of the driveways and because the cyclist tends to continue across intersecting roadways where approach riders may or may not notice you. Far safer to ride in the street.
Aug
22
comment Is my stopping dangerous when Idaho Stop is de facto but not legal?
@FredtheMagicWonderDog - But many, perhaps most intersection accidents involve a bike with the right-of-way and no stop sign/light.
Aug
22
comment Can you identify this Sachs hub?
I'd say it's a hub. Freewheel, looks like 32 spoke from here.
Aug
22
comment How do i figure out the maker of my bike?
In a word, "no".
Aug
21
comment What kind of gear shifter is this? Single lever
So the cable is frozen in its housing? (Loosen the cable where it attaches to the derailer, and see if the lever can then be moved. If not, the cable is frozen and needs to be replaced.)
Aug
21
comment Can I secure a 12v battery to my bicycle to charge it? And then attach a 12v horn to it?
What are you going to use for a generator?
Aug
21
comment Minimum tire pressure for 20 mph (32 kph) turn
You need to analyze why you "nearly wiped out". But with 90 psi in 25mm tires it's unlikely that tire pressure was a major factor. Either the surface was less stable than you anticipated, you approached the turn incorrectly, or you simply went too fast (and 20mph is pretty darn fast for any sort of street turn).
Aug
21
comment How do I replace my rear wheel?
Yeah, bike shop, if you're not terribly worried about the cost. Or you can shop around for a junker with a good rear wheel (that's 26" and has the same number of speeds). (Odd of them to steal just the rear wheel.)
Aug
21
comment Is my stopping dangerous when Idaho Stop is de facto but not legal?
@Michael - If you use a loud enough voice it's not a problem.