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Apr
6
answered How do we understand if caliper brakes can be installed on the frame?
Mar
15
comment Is it difficult for one person to ride a tandem bike?
@Holloway: calfeedesign.com/calfee-ellsworth-witness
Feb
24
comment Why doesn't this V-Brake fit my frame?
The pic looks like it would be spot on for a 27" wheel if it's a 700c now.
Feb
19
comment Why don't standard bike chains have inner/outer combo links so odd chain lengths are possible?
Rollercoaster chains don't have low weight nor efficiency as their design goals.
Feb
19
comment Why don't standard bike chains have inner/outer combo links so odd chain lengths are possible?
@David: the half-links purpose in life is to make single speeds possible in frames with really short or vertical dropouts. If you have a derailleur they are completely useless.
Feb
8
comment What speed of wind gust will cause a cyclist to swerve by 1m or more?
It's more a matter of how quickly the windspeed changes. It'd be rather easy to ride with a 45mph crosswind if it is completely constant.
Jan
2
comment Experience with GPS trackers - thieves' reactions?
Surely by 20-40 pounds you mean the currency right?
Dec
23
comment Would a moist cloth wrapped around the nose be reasonably effective as compared to an anti-pollution mask?
@Frisbee: the half-life for CO in the blood is about 4-6 hours, CO is a naturally occurring byproduct of metabolism in small quantities and the body has ways of dealing with it, it's not like heavy metal poisoning.
Dec
11
awarded  Nice Answer
Dec
10
comment If I currently have 700x23/25C tires on my bike, will 700x35C winter tires fit?
I think his chances are very good, but we don't know anything about his bike or his rims so until we know we can't say for sure. Stranger things happen all the time with bicycles.
Dec
10
comment If I currently have 700x23/25C tires on my bike, will 700x35C winter tires fit?
They probably will fit on the OPs wheels, but it's not guaranteed as we don't know what specific rim he has. Matching the ERD is not good enough, as a significant enough rim width and tire width will result in tire failures.
Dec
10
comment Why do skinny tires require less pedal effort?
This comment train has extended long beyond what it should have. If you want to discuss it further goto Bicycles Chat.
Dec
9
comment Why do skinny tires require less pedal effort?
@jcbrou: physics is what all of this is all about. The moment of inertia of the wheel tells you how much force (torque) you need to accelerate the wheel, but not how much force you need to maintain its speed. Read the (Rolling Resistance wiki article)[en.wikipedia.org/wiki/Rolling_resistance], moment of inertia is not listed as a factor.
Dec
8
awarded  Talkative
Dec
8
comment Why do skinny tires require less pedal effort?
@jcbrou: only the friction that slows down the wheel depends on things other than the mass of your wheels. At a given speed, the resistance from e.g. your hubs will be a fixed wattage, regardless how much your wheel weighs. Furthermore, in the example of the hubs, the hubs don't support the weight of the wheel, they support the weight of you, furthering the point that it doesn't matter if your wheels weigh 1 gram or a million.
Dec
8
comment Why do skinny tires require less pedal effort?
Energy and work have the same units (joule for SI), and work is the integral of force times displacement along a path. Work and energy are very closely related, as work is a form of energy, as is heat.
Dec
8
comment Why do skinny tires require less pedal effort?
@Frisbee: a larger pressure vessel requires stronger or thicker material, i.e. you would need more rubber. See wiki page. You would have to address everything to make a high pressure fat tire.
Dec
8
comment Why do skinny tires require less pedal effort?
@jcbrou: but that's not related to the moment of inertia of your wheel, that's due to deformation of the tire, wheels, and inefficiency of your hubs. Once a wheel is spinning, it doesn't take any energy to keep it spinning, whether it weighs a gram or a ton. The energy you have to put in is mostly independent of wheel mass. An object in motion stays in motion.
Dec
7
answered Why do skinny tires require less pedal effort?
Dec
7
comment Why do skinny tires require less pedal effort?
Moment of inertia is only a factor when (de)accelerating and even then it's not even that much of a factor. Fatter tires require more effort because of the pressure.