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Jan
10
comment Any issues with wearing leg warmers over tights?
Now that I no longer do winter biking, I wear my old Col d'Lizard Polartec "Powerstretch" tights when I run the snowblower in zero degree weather. On a really cold day I'll wear jeans over. The branding has changed but I think these are essentially what I have.
Jan
10
comment Would learning to ride a unicycle boost biking skills?
My opinion (being neither a uni nor MB rider) is that it can't hurt. It's too easy to become "overtrained" in a particular specialty, and the result is that the body loses strengths and skills it would otherwise have. "Stretching" yourself is goodness, within reason. (And who knows, it may be a good way to meet girls.)
Jan
10
comment Do I really need to use primer first?
If you're painting bare metal you need a primer -- one speced for metal -- even if the paint claims you don't. (You can get away with spot-priming if only a few areas are down to bare metal.) If you're going over old paint you just need to clean it and sand lightly before painting, though without a primer you may experience paint incompatibility in a few cases. There are, alas, many ways the job can go bad.
Jan
10
comment (Automatic Bike Project) amount of torque required to change gears?
Here it is for you, an article in IEEE Spectrum from last May. Lays it out in pretty good detail. There's a link to another web site (diyshift.com) for a different design, but unfortunately that link is dead.
Jan
9
comment Using a much heavier rear tyre than in the front
It's not uncommon to have a larger tire on the rear, since it carries more weight, generally. I've no idea what the added weight may do to jumping, since jumping is against my religion.
Jan
9
comment Buying brake levers, how do I find the correct ones for my bike?
Your need is to find a lever with the proper shape and fit to replace the old one, and also with the proper "cable pull" distance. "Cable pull" differs about 2 to 1 between older caliper/cantilever levers and newer V-brake levers. Most likely your discs are designed for V-brake levers, but it's hard to say that with certainty.
Jan
9
comment What maintenance is required after riding through deep water?
Any bearing that is actually submerged needs special care -- at the very least laying down on its side ASAP to drain the water, and ideally rebuilding on an accelerated schedule. But hard to say whether you have a serious problem when the parts aren't submerged -- depends on how well the bearings are sealed. The headset is generally the last thing to go. (Your freehub is apt to be the first to go, but not much you can do about that.)
Jan
9
comment Buying brake levers, how do I find the correct ones for my bike?
From your description, there's nothing unusual about the brake cables.
Jan
8
comment Weight of wheels vs. weight of tyres
I did answer the question -- here. And the answer is pretty authoritative, since I consulted with the folks at physics.stackexchange.com.
Jan
8
comment Weight of wheels vs. weight of tyres
Sigh. When you convert linear acceleration into angular acceleration you divide by radius. And despite your attempt to muddle it, the term "exponential" is not used, in either mathematics or general discourse, the way you want to use it.
Jan
8
comment Weight of wheels vs. weight of tyres
"Moment of inertia is a function of the square of the radius." But on a bicycle wheel, angular acceleration is inversely proportional to the radius. (And, contrary to what you believe, the term "exponential" does not apply to a simple squaring, but applies to a repeated application of a multiplier, where the number of applications is one axis.)
Jan
7
revised Safety guidelines for cycling in traffic
deleted 74 characters in body
Jan
7
comment Weight of wheels vs. weight of tyres
As has been shown elsewhere, an ounce of weight on the circumference of a wheel has exactly twice the effect on acceleration as an ounce of weight on the frame (and exactly the same effect as weight on the frame for climbing, etc). While perhaps this might be considered "significant", I have to feel is falls well short of "substantially greater".
Jan
7
comment What causes chain suck?
@AndreyT - Generally that's true. But you can experience chain suck with a reasonably good chain and cogs if the derailer tension is insufficient.
Jan
7
comment Any issues with yaktrax and flat pedals
Certainly getting your foot tangled is a danger. You'd have to study the particular cleats and the particular pedals together to determine how serious the danger is.
Jan
6
comment Lower back pain cause?
I've come to learn that age is a major factor. But fit/position is quite significant. I once had a bike that was a hair too big for me, especially in "reach", and changing to a smaller bike made a significant difference in both back discomfort and hand discomfort.
Jan
6
comment Weight of wheels vs. weight of tyres
I was referring to rolling resistance due to added weight. The four resistances a cyclist is concerned with are rolling resistance, climbing resistance, acceleration resistance, and wind resistance. To about 2 decimal places weight only affects climbing and (to a much lesser degree) acceleration.
Jan
6
comment Weight of wheels vs. weight of tyres
It should be noted that weight on the wheel circumference has exactly twice the effect as weight on the frame in terms of acceleration/deceleration, and exactly the same effect as weight the frame in terms of climbing effort. In general, weight anywhere has negligible effect on rolling resistance for a road bike (until the weight becomes a substantial fraction of rider weight).
Jan
6
comment Lighter bike slower than a heavier bike, possible reasons?
Looking at the pictures it appears that the tires on the Giant have larger lugs, which normally is bad for performance, but also they have a smoother centerline (though hard to tell for sure). The tires on the other bike appear to be lugged across the centerline and possibly be made of a softer rubber. A smooth centerline and hard rubber reduces rolling resistance.
Jan
6
comment Electronic shifters
I think the auto trimming is a feature that many will find interesting, especially those with 10-speed rears.