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Apr
25
comment What makes a cassette mountain bike vs. road bike?
Road cassettes do not generate greater force. It's the other way around. Given the same 100 pounds of tension coming from the chain, a 34T cog will generate more torque than a 23T. Simply put, it's a bigger lever around the hub. That means more force on the splines. The effort that you feel at the pedal is not what determines what the hub is "feeling" from the cogs. And if the cog is equal, then it doesn't matter. A 13T is a 13T no matter what cassette it is in.
Apr
20
comment If chain/ BB/ casette are dead can chainrings and derailleurs still be OK?
11,000 km quite likely means that the chain and casette have been in service for about twice the expected distance. Derailleurs and chain rings can survive a number of cassette and chain changes.
Apr
19
comment Why are most BSOs mountain bikes?
In my area (Vancouver, Canada), I see lots of road bicycles with road-UNsuitable gearing. Even the odd "Mega Range". Drop handle bars, sleek frame, thin tires .. and 30T cog??? it's completely stupid. One category of BSO's around here are the "cruiser" bikes. These are complete pieces of crap.
Apr
19
comment Difference between road & mountain drivetrain
> you can esaily fit an MTB deraileur to a road frame. Speaking of which, I see lots of road bikes around town with big cassettes, even the odd "Mega Range" here and there! (It's completely stupid, but it's probably market driven in some way).
Apr
14
comment Where can I find a bulb for my vintage 70's generator light?
Being a tinkering geek, I'd do an LED conversion, using some simple current limiting circuit that will drive the LED the same way whether the generator puts out 3V or 6V.
Apr
14
comment Smooth tires on wet road?
Scuffing a tire is enough. A smooth tire will get scuffed after a little bit of riding. Ergo, no tread pattern is necessary. QED.
Apr
13
comment I have a hybrid bike which the frame is too big, is there any modifications I can make to make it more comfortable?
In the future, never buy a bicycle without being fitted on it, and taking it for a ride. Would you buy a pair of jeans without trying them on and then try to return or exchange six months later? Also, try not to buy bicycles from some general store that also sells automotive supplies. Though, to be fair, there are decent looking items in the Halfords online catalogue. However, can they assemble them properly and provide fit and service? They let you walk out with a bicycle that doesn't fit you.
Apr
13
comment Diagnose grinding sound from single rear cog
You don't mention how (or whether) this problem is affected in any way by front shifting (while keeping the rear on the second cog). Is it better or worse on the large chain ring?
Apr
13
comment Why are most BSOs mountain bikes?
@Kibbee They don't know that drop bar height can be adjusted, and that the drop bars provide comfort and efficiency. I don't have a bike with drop bars but I have drop bar envy! It's true though that the narrower profile of drop bars makes it harder to steer around obstacles at slow speed. But there are wider drop bars.
Apr
13
comment Where does the energy loss in cycling go proportionally?
@SGR Sound is covered by "friction losses".
Apr
12
comment How do I revive my front shock?
If it can be taken apart, cleaned, re-lubricated and re-built, that might do it. Otherwise it's junk.
Apr
11
comment 9 speed Shimano shifter with 7 speed drivetrain
The distance needed to shift is controlled by the shifter (if it is indexed!), and the "ratio" of the derailleur. The 9 and the 7 have the same ratio between how much the cage moves and how much the cable moves ((see Rider_X's answer). This means that from the positioning perspective, they are identical. Maybe the 9 has a narrower clearance for the chain through the cage, and less free play in some of its joints. That's about it.
Apr
9
comment What should I use to lubricate a freehub?
A thread-on freewheel wouldn't be lubed because you toss it out once a year or couple thousand kilometers. With the replacement freewheel, you get a new gear cluster and a new ratchet mechanism. And anyway, that mechanism is only in use when you're not pedaling; it doesn't take any load. The thing you might lube in a freewheel system is the hub inside the wheel. Something like, loosen the cones, get the balls out, clean out, re-pack with axle grease, put balls back in, reassemble.
Apr
9
comment What should I use to lubricate a freehub?
Complete nonsense. A penetrant is a component of this kind of product: it refers to some sort of solvent, or mixture of solvents which carry the lubricant into the nooks and crannies. This is very often a good thing. When the solvent evaporates, the oil is left behind. Would you call sprayed acrylic enamel "not a permanent paint, but a penetrant" because it contains lots of VOC's and only a small percentage of resin solids?
Apr
8
comment Use a lock nut on a presta valve?
@DanielRHicks Is that all that is wrong with my answer? I removed the text about the dust cap and the matter of the Shrader-sized hole. I think that it's still a good way to carry the nut, thwarting the risks alluded to in some of the other answers (which use that as a basis for advising against leaving the part mounted entirely). They got me genuinely worried, so I came up with this solution.
Apr
8
comment Use a lock nut on a presta valve?
@DanielRHicks Dunno. I've seen presta dust caps with the domes broken off. I know of a bike which has an example of this; I will take a picture.
Apr
8
comment Use a lock nut on a presta valve?
@DanielRHicks The nut prevents the cap from moving down farther, so that the tip of the valve won't break the cap. But why would you keep tightening, when the cap is snug against the nut? The nut gives the user a clear target for how far the cap goes.
Apr
8
comment Use a lock nut on a presta valve?
@DanielRHicks > and if it can be overtightened without the nut it can be overtightened with it in place Not in the same way (dome breaking right off the cap).
Apr
8
comment Use a lock nut on a presta valve?
@DanielRHicks Thanks for the pointer to the grommet. Some of those things in the image search are also called glands in electronics (rubber rings that fit holes in sheet metal, protecting cable shields from being cut). I want that now.
Apr
8
comment Use a lock nut on a presta valve?
@Johnny Ah yes, I see that you did in response to Vorac. That's also who my comment was supposed to be directed at, oops. Precisely: it's not a valve nut problem. Nut or not nut, that valve is at risk in such a situation.