The collision of archaeology, cycling, and aortic valve repair

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Monday, November 1, 2010

Trickin’ Out the Granny Cruiser

After tackling my first organized metric century, I decided I needed to hone my training. To bring that along, I’ve made some modifications to the Granny Cruiser. I wanted to convert it (a Specialized hybrid) into something that has more of a road bike feel to it. I swapped out the big, fat spring loaded, gel filled seat for a small and hard road saddle. I want to get my butt used to riding on that kind of saddle. Switching back and forth was just messing with me. I also got rid of the 38mm bumpy tires and went down to 32mm smooth tires. I could have gone narrower but the bike shop didn’t have them in stock so I went with what they had. Granny is all tricked out.

I could have gone even further. I can still change out the seat post—get rid of the rusted shock absorber post I’ve got and replace it with something lighter. I could also replace the big, fat fork with rusted shocks with something lighter, too. Right now I am not as worried about weight as I am fit and feel. I want my body (my back and my butt) to get used to riding a road bike…or some cheap approximation.

Oh, and I also got a cheap cycling computer. It displays speed, distance, time, calories burned, etc. I had been using my IPhone to do the same thing, but the battery wasn’t lasting on the 4 hour rides. Plus, tugging it out of a pocket made it hard to check. The bike computer is mounted right on the bar so I can obsess on speed and distance all I want. At one level, that is satisfying and at another it is just a bad idea. I like to know how fast and how far, but it is way too easy to focus on that and miss the ride. Way too easy.

The thing with this bike computer is that I wonder about its accuracy. In order to keep track of speed and distance it has a sensor that is mounted on the fork with a magnet on a spoke. The magnet spins past the sensor and that is how it measures distance and speed. The thing is that I have had to mount both really close to the center of the wheel in order for the magnet to get close enough to the sensor…because of the big, fat fork on my bike. The instructions for the computer show both being mounted about two-thirds of the way out the radius of the wheel. I am no physics genius, but I somehow doubt that this thing is designed to compensate for differences in the amount of time it takes the magnet to spin around. The further up the radius, the longer it will take and the closer to the center the less time it will take. That has got to affect how it measures speed and distance. I’ve ridden the bike twice with the computer and the second time the sensor and magnet moved almost to the center of the wheel. On that second ride, the distance seemed to be off by about a half a mile over 20 miles. The first time, it seemed to be pretty well on…based on the gps in my IPhone.

I hear you Clement…”none of these things are all that accurate, just go ride your damn bike!”

Anyway, with my new toy and modified bike I went for a 40 mile ride last Monday. When I ride I try to keep my cadence high and steady, and that means shifting down when I need to. I went out hard and tried to keep a 17 mph pace and I did a pretty good job. I made it home in just under 2.5 hours. I was pretty happy with the pace and my ability to keep it up.

Feeling all Superman-like because of my experience on Monday, I went out pretty hard yesterday. I again tried to keep the cadence high and maintain a steady high speed (thanks to my new computer I can watch it go up and down with each gust of wind, slight hill, and shift of the gears). I did really well on the first 20 miles. I averaged 18.5 mph and finished in about an hour and 10 minutes—the fastest 20 miles I’ve done. As a quick reality check, professional cyclists average 24 mph or more and keep it up for 100 miles.

On the return 20 miles I found out why I had gone so fast on the ride out…I had a pretty strong tailwind that blew me down the road. On the way home…I had a nasty headwind…all the way home. In case you are wondering, riding into the wind is hard…and demoralizing. It is hard to keep a steady cadence and you spend a lot of energy trying to get back to the pace you want. Riding into that head wind killed me in less than 2 miles. The 20 mile ride home was slow torture. I made it home in just a little over 2.5 hours and averaged 16.5 mph. Doing the math, if I did the first 20 miles at 18.5 mph then I did the second 20 miles at 14.5 mph. Superman to Pee Wee Herman again.

I think I learned a lesson. I need to maintain a steady and sustainable pace. If I want to do interval training to build speed, that is fine but my intervals need to be a lot shorter than 20 miles. The same theme keeps coming back…I am an idiot for not figuring out how to do this stuff before I go and do it…and I pay the price with suffering.

I’ve requested some books from the library. Unfortunately the perfect book for me was already checked out: The Complete Idiot’s Guide to Cycling.

Further proof that thinking before I act is not my strong suit…

Never Open Cat Food with Anger in Your Heart

I woke Saturday morning to the same sound I’ve been waking to for several weeks…ever since we started feeding our cats wet food…the sound of the two of them meowing at me to give it to them. We call it stinky food…because it is stinky. I really just wanted a cup of coffee, but I also really wanted them to shut up. They count on that and they push me to the brink. So before I got my coffee I started getting them some stinky food. We’ve been buying the individual serving cans with the pull-tab open. The pull-tabs are handy, but every once in a while they fail. Today was one of those days. Because I didn’t want to put the broken can back and have to deal with it later, I tried other ways of opening it. First I tried the can opener. It is one of those fancy ones that takes the top off without leaving a sharp edge. I ran it around a couple of times and about ripped the nail off my finger trying to pry the top off. Yeah, those don’t work on pull-tab cat food cans.

At this point I was getting a bit frustrated. Well, maybe more than a bit frustrated. I was getting mad. So I got out a fondue skewer. I think you can see where this is going. I banged on the top of the can to try to push it in. That didn’t work and I was really getting mad. So, I got out the big wooden spoon. You know the one, every kitchen has one. I got that sucker out and I slammed it down on the lid. Nothing happened. Really mad, I raised that spoon in my hand like Norman Bates and plunged it down with all my might. In a calm and rational frame of mind, you should be saying, “Don’t do it, you idiot it will…” Yep, that spoon handle blasted through the can lid and sloppy, stinky cat food exploded all over me and the kitchen. Coffee became moot. My eyes were bulging, veins throbbing in my temples. With all the dignity I could muster, I scraped that stinky food off my face and the counter, piled it on a plate and gave it to the cats. And then I made my coffee.

If I had made coffee to start with, I might have handled the whole thing differently. I might have been a little smarter and a little calmer. But I didn’t have coffee and I wasn’t smarter…and I had anger in my heart.

7 comments:

Clemency said...

"The further up the radius, the longer it will take and the closer to the center the less time it will take. "

Think about that for a second. Maybe after you've had coffee. ;)

The Fat Archaeologist said...

Yeah, the further up the radius (away from the center of the tire) the longer it will take the magnet to make one rotation. What is wrong with that science guy?

Clemency said...

Patiently waiting for the lightbulb.... :)

The Fat Archaeologist said...

The bulb is obviously burned out, so you could wait a long time...better just enlighten me.

Clemency said...

Whoops. Sorry to leave you hanging. Think of the one spoke the magnet is attached to. The spoke is straight, and it always passes the fork at the same time. You could put the magnet close to the hub or way out by the rim, but the spoke its attached to still passes the fork at the same time, and so the magnet does too, regardless of where you attach it. Put another way, the magnet near the rim is moving faster than a magnet close to the hub because its covering a larger arc in the same amount of time, but the RPMs don't change. The computer works by measuring RPMs as a function of wheel circumference. :)

The Fat Archaeologist said...

OK, I can see that. I told you I wasn't any physicist.

Anonymous said...

Eww stinky cat food. Never let them like that.
Joyce

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