Wednesday, March 23, 2011

Today's Forced Training:

- Bike Handling Skills. 
- Brought to you by Old Man Winter. 

Nothing like a commute home as your pawls freeze up and your pedals spin with no engagement with the rest of the time spent biking sideways. Gah. 
Still, I can't complain. It could be worse, right?

Tuesday, March 15, 2011

If I Were King...

... I would make this an official national holiday.

Happy 'first outside ride of the year' day/week everyone!

I hope yours was awesome.

Saturday, March 12, 2011

On the Energy Demands of Different Weight Tires

The other day brought me into the local shop, for probably the 6th time this week but that's another story, to get some training tires. My current ones are peeling. Yes peeling. Maybe they got sunburnt down south. 

Anyway, I'm looking forward to riding these tank treads I picked up, because no flats while training and not worrying about riding through occasional debris, or on sketchy-surface roads, is a very nice thing. 

As with any cycling related purchase, there's a million choices, with as many different prices you can pay. With it being a pretty slow day today (I swear I don't normally think of stuff like this ;) ), I got to asking 'the universe': 
How much of a difference do lighter, more expensive, race tires actually make? And I want the answer in Watts, a unit most cyclist can relate to. 
- This 'how much' is always the question, as far as I'm concerned, when you're picking up something new. Some gimmick can claim it 'does this', but if that effect is actually imperceptible - who cares, get the regular thing instead. 

- Discalimer: The following is a nerd-out of epic, like the cycling term, proportions. Proceed only once pocket protector and taped glasses have been engaged. 

The specific question is:
To accelerate from v_1 to v_2 over a time interval t, what is the energy required, in Watts, for a 400g training tire, compared to a 200g racing tire?
The answer will take into account forward motion as well as rotational motion, the only variable is tire weight and speeds. 

Answer 1:      (v_1 = 30km/hr, v_2 = 35km/hr)
- The heavy tire takes 0.51 W MORE than the lighter tire, if acceleration is over 5 seconds. 

Answer 2:      (v_1 = 45km/hr, v_2 = 50km/hr)
- The heavy tire takes 0.66 W MORE than the lighter tire, if acceleration is  over 5 seconds.

- Nerd note: answers differ. That's the non-linearity of kinetic energy. Nature is whack. 
- The question of rolling at a constant speed is moot, as weight will not make a difference. 
- The universe has the (few) answers that Google doesn't!

Conclusion:
The weight of a boat anchor of a tire will not slow you down much at ALL. During accelerations of race-winning consequence, a top rider would be putting out at least 300 W, up to 1800 W for pro sprints. You'd have to double the weight of the tire AGAIN over the light racing tire to even get a 1 W difference. That's almost a motorcycle tire. 
The most difference this makes over the lighter tire, on the most humble power outputs, is a meager ~0.33%. 
(There's other obvious factors like materials and pressures that will affect rolling resistance and all that, so this talking purely about the WEIGHT of the tire, something very easy to measure accurately)

I hope you found something interesting here and may there be few flats for all this summer! (keep reading for the nitty gritty)
----------------------------------
The Nitty Gritty: 
- Total Energy of a rotating tire: 
E_total = (1/2)m*v^2 + (1/2)I*r^2

- Change in energy from v_1 to v_2 (after some re-arranging):
dE = (1/2)*m*(1+r^4)*(v_2^2 - v_1^2)

dE gives the change in energy in Joules, divide this by t (5 s) to get Watts. Compare answers using different m's (tire weights).

Friday, March 11, 2011

That racing feeling

I stumbled upon this while doing the daily following up on two big stage races going on in Italy and France right now.
This finish, from Tirreno-Adriatico today, is just awesome. Check Hushovd in the world champion jersey lead out his teammate and basically drop the peloton.

Hairier than an armpit on the French Riviera. Nerves of steel to be a sprinter.

Saturday, March 5, 2011

Race Report #1, Valley of the Sun

You'll have to excuse this post being out of order - the Valley of the Sun race was in mid February, before my levels of self importance rose to the blogging-point ;).

Anyhow, I'm finally getting to this one, as I plan to have all race reports of 2011 up on here as a sort of history of flame-outs, repeat solo wins using only one leg, or whatever else might happen. I'm really not in the prophecy business.

So the race breakdown:
Valley of the Sun Stage Race. One flat 23km time trial, one 145km circuit race with a 3km climb to be done 5 times, and then a 7-corner criterium on the last day, all in/around Phoenix.

The plan was to still race cat2 at this point just to get more experience before the cat1 races we'll be doing as a team later on in the year. Also for the first stage, I did not have a time trial bike to bring in, putting me in the vast minority as disc wheel after disc wheel (and full TT setup) rolled down the start ramp, so the plan was to basically NOT finish last, and hopefully not kill myself to accomplish that. I went out with my regular equipment, pushed, but not too hard, and finished 69/85. Remarkably, that was a minor success. I even passed one guy in full TT setup - must not have been having a nice day.

The next day for the road race there was no holding back, so I ate my wheaties that morning and went in feeling ready to go. Along with the hill there was a tricky crosswind section that smushed the peloton over to one side of the road, where there happened to be a rumble strip on the road too! That was definitely interesting.

Anyway, trying to make/get into the first good break the first time up the climb, I bridged up to a group of about 8 guys who had made a gap, and sat onto this move to catch my breath and see what would happen after that. And we got caught. First break, too many guys, maybe my dead weight at the back, peloton too happy to chase.

Going on like this, following individual attacks or making my own, then resting during the next one, was the pattern for the first lap and bit (of 4.5). Of course a move of 5 guys gets away while I'm catching my breath a few rows back in the group. Great. More attempts a little later using the crosswind section to make a split almost worked, we got a gap with about 10 guys but again, collusion was not there and the gap closed up after not too long. It goes to show how easily crosswinds can make splits though. If only we were more organized and committed, you don't even need the strongest guys to do it, just some cooperation.

Then slowly on the 3rd time over the climb, a few guys were dangling out front while some team set tempo on the front of the peloton, I thought, those guys will get eaten up, we have a very long, fast, straight descent and they don't stand a chance against a peloton there. Well, once over the top of the climb, the team workhorses who were chasing sat up, the peloton slowed, and the 2nd group of those danglers got away! I couldn't believe it. Props to those guys for sticking with it. They were so close at the top of the climb but the chase just gave up and there I was stuck again behind the move.

Being so close to the finish now there was no point in attacking since teams were getting more attentive and drawing in all flyers that went out, I just positioned for the sprint and tried to be as fresh as possible after all this messing around. So we approach the climb the last time, where the finish line is at the top. Teams still on the front, pace not too hot yet but still firm. 2km left, and the first jump goes. You could tell everyone was waiting for it, but didn't want to be the first to do it. This draws out a stream of riders, including me, past the teams train and the leadout starts. It was quite a drag, since we had so long to go still and all uphill. Immediately people start popping and throwing elbows of desperation all over the place trying to get every ounce of energy out of themselves. After going around some riders I latched onto the small leading group here and just hung on until the finish. We were all redlining so hard there was no real sprint at the line, I don't think anyone even changed position/order in the last 100m. I look back and there was a small gap to the peloton  from the group of about 12 that I finished in.
So overall it was 25th/85 for me that day, tried to make some kind of result after missing the breaks. Ah well, live 'n learn.

Lastly the crit the next day in downtown Phoenix. Fun course with all the turns, hadn't done a crit quite as technical before. After settling in with the pace on the first few laps, decided to go out and make an attack and was joined by two other guys. We made the one and only breakaway of the race for a few laps, and although we were going full out we just couldn't get away from the teams that were chasing to secure the lead of their teammates. Easy to defend a general classification lead in a crit, very hard to get time out, although that's not really what we were after.

After getting caught, a bunch of uneventful riding around, then went out for a prime and scored some cash:


If anyone reading doesn't know what a prime is, its when the organizers decide to say there will be a prize for whoever crosses the start/finish line on the next lap first. Usually its just to make the race more interesting and keep everyone from just sitting in all race waiting for the final sprint. I made a few more attacks after this to try and get another break going with no personal interest in the sprint this day. Once the finish came all my matches were burnt so I just rode in safely at the back of the pack.

Pretty lean on results from this race but lots learned, gained some good experience that will come in handy for the more important targets of this year.

Didn't mean to turn this into a novel, I'll up the brevity for the next ones ;)

Thursday, March 3, 2011

The End of Training Camp

A month has passed in Tucson, presumably elsewhere as well, and within that month were the hardest, longest, and really the best weeks of riding and training I've ever experienced. Hard not to accomplish in an environment where there are few distractions from training, one single day of rain out of 28, and perfect mountain roads to work the body and skills in different ways.

Arbitrary though: With all the cyclists from out of town that come here for winter training, it makes one wonder if it makes a dent in the economy of the city. If the city planners knew, or cared, they could make quite a bit of money setting up specific travel packages or something for all the cyclists and teams that are coming here already and self organizing.

This winter's training/set up has me looking forward to race season more than ever, things will be totally different this year, again.
I'll have trained a little wiser, and way more than before, the team setup is something totally different from what I'm 'used to', not that any cycling year has been routine for me yet, always huge changes year to year. And the racing itself will be on a much larger scale - bigger races and tougher competition. But I'm feeling good and as ready as I should be at this time of year, so any doubts of getting flung out the back once the gun goes off have gone away. More specific training will start soon that should have me especially ready for the hillier races on the calendar.

It's good to be back in Canada, and back to work contributing, however slight, back to society.

The last day of camp was spent making my way by bike to Anton's appartment near Mt. Lemmon, where we set off to ride to the top of that mountain which I'd been living in the shadow of for a month. What a long ride that is - 45km from base to summit and over an HOUR of descending. As always there's lots to see on the way up, especially the change with altitude like snowbanks appearing. We might have had a snowball fight while riding up with whatever snow I could snatch from the side and toss over. I was definitely toast after that ride which brought the ticker up to 185km for the day.

Just over a month until our first race, April 10th, Tour of the Battenkill in New York. Our team will race for the first time with most of the riders together, and I can't wait! Its the tail end of 'training season' and almost race season, how time flies.

Here are some pictures from Lemmon:
 At mile 14, a little more than halfway up. The city is way in the distance. 

 A little further up, a little further away. Hoodo!

 At the top, after climbing for HOURS. Why am I climbing more? Must be proof of evolution: vestigial instincts left behind by our ape-ancestors

A view from the last few km's of the last ride of camp