Sunday, November 18, 2007

Track Part 2

The track school at the velodrome is run by volunteers, people with a great love for cycling and who want to see the velodrome succeed. Their approach is to introduce participants to track riding and get people on and off the track safely. The cost of the Track 1 course is $30 including bike rental. A team from PedalPerformance.com was there with me along with a couple of other first-time riders.

The program starts with bike setup. The velodrome has a number of bikes in a variety of sizes that are far from a custom fit, but are just fine for the first time track rider (bike #21 was mine). The bikes at the velodrome have a shorter wheel base, track specific bars, and possibly a steeper position than your regular road bike (it may be close to your tri/TT bike). The wheels were clinchers, tires were garden variety (save your money and just buy a good quality tire, not a track specific tire I was told) and inflated to about 100 psi. Participants need to bring their own pedals/clips.

Gearing at the track is limited to 48X16 or less in order to restrict speeds in what was described to us as the shortest and steepest track in North America (138 meters, 50 degrees in the corners, 15 degrees on the flats). According to Sheldon Brown's Gear Calculator (700c, 172.5mm cranks), a rider with a crank RPM of 80 would travel at approximately 30 km/hr. That means that if you want to go 60 km/hr, which people do reach on the track, you would need to pedal at 160 RPM.

The first lesson is just learning to ride the bike. If this is your first time on a track bike, be prepared for cross over between your front wheel and foot on the forward portion of the pedal stroke. The drills practiced speeding up, slowing down, steering by turning the handlebars instead of leaning and beginning to be comfortable with the momentum or speed that track bike stores up. The many kilometers that I put in on the fixie over the past 2 years prepared me for riding in a straight line, but adjusting to the new turning technique took a little while. "Twist your shoulders!" was the mantra that followed me around the track. It is also possible to coordinate turing with the pedal stroke so that the wheel is always turned away from the leading foot, allowing you to avoid contact between your foot and the front wheel, although I was only successful at that about 50% of the time. If this happens, just keep pedaling, do not panic.



Next we worked on manuevering between sets of cones placed on the floor, followed by moving on to and off the track. Hitting the bank on the straight-away for the first time was pretty exciting and my mind was very busy doing calculations (too busy I would soon find out). The technique is:

  1. Shoulder check
  2. Twist the bars and ride up the track, don't lean into the track
  3. Slow down at the top cone
  4. Shoulder check
  5. Ride in a relaxed angle down and off the track, controlling the speed of the bike

Next we were given the chance to get on the boards. Riders need to be mindful about the entrance and exit angles to avoid contacting the pedal with the track surface (as so many have clearly done as indicated by of the scars on the boards) and to maintain about 30km/hr to stay upright in the turns. On my first attempt I was stiff as a board and I did not accelerate as fast as I should have. I came into the first corner and felt the press of gravity as the bike leaned on its side. The sensation was so foreign that I fought the track instead of staying loose and I soon found myself riding off the track about half way through the turn. No wipe out, but my over-thinking almost had me sliding down the boards on my first attempt.

After watching a few others, it was my turn again. I loosened up, gave it a good push at the entrance and all of the sudden I found myself up. I let out a couple of "woohoos!" that echoed through the building and 2 laps later I was back down.

The leaders then set up a pace line of 5 and the instructors led us around the boards, along different lines at different heights on the track (black is the lowest, red next and the blue line at the top, the yellow line is really a warning line that you are at the top of the track and are about to launch into the rafters). On the second lap the lead rider peeled off and rode above us. That was a little alarming at first as in the turns, we would basically be stacked up, one rider leaning over the other. On consecutive runs, I relaxed more, fiddling with my position on the bike, practicing the art of steering in the corners and using the slingshot of the turn to pick up speed. There is nothing quite like the feeling of being pressed into the bike as you build up energy and are fired out the other end.

All totaled, I went around the track about 40 times, or about 5.5kms.

Key Points I Learned

  • Relax the arms
  • Press on the left side of the handlebars in the turn to correct your line if you are edging up the track
  • Use the turns to accelerate and be careful not to go too hard into a turn.
  • Be aware of the pace and learning how to gauge your speed to prevent going too fast and working yourself up the bowl and over the rails!!
  • Enter and exit at the right place on the track
  • Always check over your shoulder before changing lanes or entering and exiting
The next step is to schedule the Track 2 lesson and participate in the Sport-Rec session on Thursdays.









Track Rider Lean Analysis: http://www.analyticcycling.com/genmodel/LeanAnalysis.html

Friday, November 16, 2007

Track Part 1

On Saturday November 17, 2007 I will be heading down to the Forest City Velodrome to partake in the Track 1 class. This is the first of 2 pre-requisite classes to be eligible for track racing at the velodrome in London Ontario.

The velodrome is housed in what was once the "Ice House", or the "London Gardens", the previous home ice of the London Nights and the site of many jubilant outings to watch hockey when my family lived in London Ontario. I even had the opportunityu to play on that surface as part of a AA team in London.

I returned there last winter to watch the 5th day of 6 Day Racing and have been thinking about getting on the track ever since. My goal for the day is not to crash, and if I do, to get up and ride again.

More on Sunday...

Wikipedia info: http://en.wikipedia.org/wiki/Six-day_racing

Friday, November 9, 2007

HED wind calculator



This is a nifty little tool that is intended to help you with wheel selection, but also gives you some idea of the effort you will have to put out under various wind conditions to go a certain speed.

Figuring out how to use this was pretty easy. Start with adjusting the rider speed and then place the wind direction perpendicular to the rider. Bump up wind speed and watch the bottom line graph change. This number correlates to the apparent or approximate wind resistance and should give you an idea of the amount of work required. Higher number = more work. Perhaps they should have added little sweat indicators and sounds of someone wheezing in the background.

The diagram in the bottom right hand corner shows how the rider experiences the wind. Note that a perpindicular wind direction at 20km/hr results in an wind that is felt slightly from behind, but as the wind speed increases the side wind becomes more pronounced.

What this means for wheel selection is that if you expect direct on head winds or mild side winds you may be best off selecting a disc or very deep dish wheel. The more that the wind is expected to slam into you, the more a middle depth (50-60mm)deep dish or aero spoke wheel makes sense. A strong compromise is to run a trispoke on the back and a deep dish on the front (a very versatile combo).

Keep a few of things in mind:
  1. The depth of the front wheel has more influence on the handling characteristics of your ride than the rear. It also gives the greatest aero advantage, which may explain those with only an aero spoke wheel on the front and a traditional rim on the back.
  2. Your body may actually contribute more to handling difficulties in heavy cross winds than any set of aero wheels.


Friday, November 2, 2007

Keirin Carnage


Most Keirin races will have a few crashes and I can only imagine that the adrenaline must be pretty high out there. This clip from the Leigh Valley Velodrome was particularly alarming as the last crash took place after the end of the race.

-----------
From: http://www.reference.com/search?r=13&q=Keirin

The keirin is a mass start
Track cycling event in which 6 to 9 sprinters compete at one time in a race with a paced-start. Riders draw lots to determine starting positions and start as the pacer (which could be a motorcycle, a derny, or a tandem bicycle, for example) approaches. The riders are required to remain behind the pacer, which starts at the deliberately slow speed of about 25 km/h, gradually increasing in speed and leaves the track approximately 600-700 meters before the end, at a speed of about 50 km/h. The first cyclist to finish the race is the winner (sometimes finishing at 70 km/h). Keirin races are about 2 kilometers in length (8 laps on a 250m track, 6 laps on a 333m track, and 5 laps on a 400m track).
------------

Keirin is supposed to be Roller-Derby on bikes, but the last crash in the video just seems excessive. Cyclingnews.com gave the following update: (http://www.cyclingnews.com/news.php?id=news/2005/aug05/aug04news2)

The final result was few suspensions and thankfully no permanent injuries were sustained by the riders. Some may say that it is all part of the race, but a tackle/check like that is the same as finishing a play after the whistle blows in hockey; dirty and dangerous.