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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.
Aug
21
comment What kind of gear shifter is this? Single lever
(If the bike has been neglected a bit the most likely problem is a rusted up cable housing, keeping the cable from moving.)
Aug
21
comment What kind of gear shifter is this? Single lever
What do you mean by "doesn't shift"? The knob just affects how hard it is to move the lever. There is a cable from the shifter to the derailer. That cable should be tight, except perhaps when the lever is pushed all the way to one end, corresponding to "first gear" on the front sprockets. When you move the lever the cable should move and that should move the derailer. It's all out in the open to see, and hence easy to diagnose, if you simply study it a bit.
Aug
21
comment trouble inflating tires
Some chucks require you to disassemble them and reverse a piece inside to convert from Schrader to Presta.
Aug
21
comment trouble inflating tires
After you unscrew the knurled screw on top of the valve, tap it with your finger to release a puff of air. Sometimes the rubber gasket inside the valve sticks, and doing this frees it. And if you hear air escaping as you pump you do not have the chuck properly attached. Sometimes you need to screw the outer collar tighter to adjust it, and there are other things that can go wrong as well. (I had my chuck go bad a couple of years back when the pin holding the lever worked loose, eg.)
Aug
21
comment What kind of gear shifter is this? Single lever
Looks like a bog-standard friction shifter to me. The knob on top adjusts the degree of friction. If the friction's right, the cable moves freely, and the derailer is properly adjusted, it just works.
Aug
21
comment Is my stopping dangerous when Idaho Stop is de facto but not legal?
@RossMillikan - If there's a bike behind me I don't rely on hand signals. I yell out "Stopping!" in a loud voice.
Aug
21
comment Is my stopping dangerous when Idaho Stop is de facto but not legal?
Of course there are parts of the country where no one stops at stop signs, and they often don't even slow down.
Aug
21
comment Why Do the same size tires say they can hold different amounts of air (psi), and does that matter?
@rogue - Keep in mind that most bike tires, especially those on cruiser-style bikes, are woefully under-inflated. If the tires say "Fill tire to 40 PSI" that's almost certainly the minimum pressure, and the tires can manage 65 PSI or so. The manufacturer is trying to emphasize at least getting the minimum pressure. (Likely if you look VERY CLOSELY you will find the pressure range on the tire, in fine print.)
Aug
21
comment Why Do the same size tires say they can hold different amounts of air (psi), and does that matter?
The air pressure a tire can safely retain is a function of both the geometry (width) of the tire and the quality of construction. I'm guessing that the Walmart tires are of poor quality. That said, most tires can safely withstand about 20% over their sidewall "limit" (though this depends to a degree on the quality of the wheel rim).
Aug
21
comment Does the valve have to be straight when replacing a tube?
@Carel - The point is that if braking will cause a tire to slip when the valve stem is not straight, it will cause the tire to slip when the valve stem is straight and make it not straight. If the tire is slipping the tube will eventually fail at the stem, regardless of whether it starts out straight or not.
Aug
21
comment How to remove a stuck seatpost?
You'd see something sticking out of the outside end of the lug, generally it would be shiny chrome or stainless.
Aug
20
comment How to remove a stuck seatpost?
Might work, but note that in some frames the threaded portion of the seatpost clamp is an insert, and using this procedure would drive it out of the frame.
Aug
20
comment What steps to take to replace bike frame
Yeah, except in unusual situations, you'd be much better off buying an new (used) bike and selling the one you have. Among other things, it's hard to buy just a frame. (Note that in some cases you may want to buy the new bike, swap some parts such as the seat or wheels, then sell the old. But that's just a refinement on the basic buy/sell scheme.)
Aug
19
comment How to remove a stuck seatpost?
I think that by the time most folks are resorting to the techniques here they have pretty much emptied their cans of WD-40, Liquid Wrench, et al.
Aug
19
awarded  Nice Answer
Aug
19
comment Does the valve have to be straight when replacing a tube?
By the way, your tire is dangerously cracked and should be replaced. This may be from running at too low a pressure, or maybe just age.
Aug
19
comment Does the valve have to be straight when replacing a tube?
Another way to adjust is to deflate the tire, then "walk" the bike forward/back (as appropriate) until the valve is straight.