Singlespeed & Fixed Gear - damn shimano 105 paint

So I've been riding my new bike for a week and the paint on the crankset is wearing off already, looks to be from the socks I'm wearing...

what are you wearing steel wool socks!!!

Wow. Now I know what people mean when they say ShimaNO

Wow. Now I know what people mean when they say ShimaNO

Dont jump to conclusion. I have the same crankset and black paint is holding up fine after 7 months (it is powdercoated, and still looks like new). The guy must be doing something really awful to that crank.

So I've been riding my new bike for a week and the paint on the crankset is wearing off already, looks to be from the socks I'm wearing...

it looks to me like the heels of your shoes are rubbing. try riding with your heels further out. your knees/hips/ankles might thank you.

huh didn't notice that, it worse where the ball of my heal is in the peddals. BUT powdercoating should not be rubbeing off from the action of leather against it.

sure it will think of how many times you're rubbing that one spot
for every mile you ride. Actually one could figure it out (Ryan C)

check your shoes for wear too.

jeff



huh didn't notice that, it worse where the ball of my heal is in the peddals. BUT powdercoating should not be rubbeing off from the action of leather against it.

Easy enough. A 700x23 wheel is about 26.28" across (according to Sheldon). A quick dialog with our friend pi tells us it's 82.56" around. There are 63,360 inches in a mile, so that's 767.4 rotations of the wheel.

Let's assume you got the "usual" 74" gear (thanks, Sears!). That's a 2.816 ratio, so those 767.4 wheel rotations are 272.5 crank rotations. If your shoe is rubbing on that crank, it's doing it about 273 times a mile.

No wonder the coating is wearing!

ok my gear is 88.7, what does that mean? oh and there is no apparent wear on my shoes...

Easy enough. A 700x23 wheel is about 26.28" across (according to Sheldon). A quick dialog with our friend pi tells us it's 82.56" around. There are 63,360 inches in a mile, so that's 767.4 rotations of the wheel.

Let's assume you got the "usual" 74" gear (thanks, Sears!). That's a 2.816 ratio, so those 767.4 wheel rotations are 272.5 crank rotations. If your shoe is rubbing on that crank, it's doing it about 273 times a mile.

this should be on some high schooler's math test.

All my cranks get the polished spots. Since I can't see it whilst I ride it just doesn't matter.

Easy enough...

Yes it is. Ask and it shall come true. Thanks!
...now can you help me with my actual work?


jeff

ok my gear is 88.7, what does that mean? oh and there is no apparent wear on my shoes...

A taller gear means that your crank will turn fewer times per mile. In fact, it will be in direct proportion the gear. So we can simply take 74/88.7 times 272.5 to get 227.3 crank rotations per mile.


this should be on some high schooler's math test.

Or homework or something. Has it ever struck you how sad it is that most school work is just busy work? How come kids aren't encouraged to apply math to fantasy sports leagues, figure the odds on black jack, calculate torque at the axle on their car, etc.? Instead a classroom of 30 kids are all assigned the same set of problems which generally have no connection to anything and even when they're sort of relevant, it's only a small segment of the class that cares. It's amazing how motivated a student is when they actually care about the answer.

"We can't teach because we don't have time," seems like a pretty sad statement, doesn't it?

-Trevor, who's fed up with arbitrary rote education.

Trevor, who's fed up with arbitrary rote education.

You would be amazed at how bad it is at the college level too. I had a junior in engineering tell me that he couldn't complete one of his homework problems because he was not given the formula for finding the volume of a cone. Guess he hadn't heard of google, or of a geometry text book. So much for engineers being problem solvers.

Shoes or boots could be doing that.

Trev- you have some excellent points on education. In my ecology class in high school, no one cared until we started applying the expamles of soil nutrients to marijuna growing. When we got to hydrophonic growing systems-oh boy!

"We can't teach because we don't have time," seems like a pretty sad statement, doesn't it?

-Trevor, who's fed up with arbitrary rote education.

Interesting points have been raised on education here. Working toward a doctorate at a research-based school certainly exposes me to all types of educators. In the past two semesters, I have only had one non-elective course that had a single instructor - for most classes we have someone teaching for anywhere from one day to two or three weeks at maximum, teaching from their area of expertise. Some people, both professors and department heads, are there specifically to teach, and they are among the best teachers I have ever had. However, there are many who are only at the school because they do research there, are prominent in their field, bring in major funding to the school, and they tend to epitomize the arbitrary rote education you speak of. Funny how it never goes away.

/rant

Hey alexi, show us pics of the whole bike!

You would be amazed at how bad it is at the college level too. I had a junior in engineering tell me that he couldn't complete one of his homework problems because he was not given the formula for finding the volume of a cone. Guess he hadn't heard of google, or of a geometry text book. So much for engineers being problem solvers.
same thing happend to me but he was a freshman and it was the volume of a sphere. (related rates problem) CALCULUS 1 stuff.
unbelievable.