I've been trying to figure out this power variance between TT and Road riding. I'm starting to think the work on center of gravity might be a factor for me. My elementary understanding is that body position affects where the power stroke is and maybe I generate more power in that band in my TT position than the technique I'm using in the regular road position.
I think this has something to do with more of my body being over the downward portion of the stroke so I'm using more body weight to resist the upward force of my legs.
The good news is I can probably alter my pedaling technique on the road to generate more power by driving earlier in the stroke. I am definitely going to pay more attention to metabolic costs of different pedaling techniques, foot position, etc. Lot's of testing to do but I'm hopeful. Here's some resources.
Last edited by kleinboogie; 03-02-11 at 09:53 AM.
I'd like some guidance on 180 turn arounds. The one on the race course this weekend doesn't seem to be wider than 2.5 lanes wide. I've been practicing, but can't get above 14mph entering and when i exit out, i'm leaving at 11mph. Any tips on rounding the stupid thing faster? The TT i will be doing is prologue-length at 2.2miles. I somehow think the turnaround will determine the winner...
Last edited by echappist; 03-02-11 at 05:42 PM.
^let me know what you find out... I always suck at turn arounds. The only thing that helps me is to make sure I am in the correct gear for the acceleration before I make the turn and then just don't crash while making the turn.
on another note, I am finding it difficult to find nice traffic free roads where I can stay in the aero bars for extended periods of time at full power. I have gotten to the point where I just started doing hill repeats/extended periods of climbing while in the aero bars. I am wondering if this will help my technique for putting down the same power on flat roads? my cadence is usually quite a bit lower going up hill vs flat (similar power) and while climbing I find myself gripping the aero bars a lot tighter
Here's a question. I want to start time trial racing and I have read this whole thread. A couple of posts came close to answering my question but not fully. I'm boggled -as are most newbs with regard to any discipline- with all the info I've been reading and the equipment cost I'll likely encounter. Let's say I scraaape enough dough to buy an entry level/pre-owned committed TT bike and associated kit (skinsuit, helmet, covers). What next? Can the OP or other TT vets put these items in order of importance to them personally? Or what would you buy first if you had to buy one item at a time and spend a while saving in between?
1. Power meter.
2. Nice head unit such as 705.
3. Aero wheels such as disc/tri-spoke front or disc/deep-section front combos.
4. Any other items you find necessary or important.
smooth and fast?
All that's necessary or important is a will to suffer and a bike with two wheels and some pedals.
Next: skinsuit (you can argue that this should be "helmet", but you'll look like a tri-nerd in regular road jersey/bibs and aero helmet)
Next: TT bike (for the body position opportunities; you'll tend to be too upright on a regular road bike)
Next: deep dish wheels (at least the front wheel)
Next: disk wheel
The powermeter is a training device primarily. It is useful, some would say extremely useful, but not necessary. Ditto the 705.
Happily, this list is more or less in the order of cost. Now, if you had infinite money, then go all out and buy everything. That said, it's usually more cost efficient to just slam the stem and put aerobars on your bike with, perhaps, a triathlon (forward offset) seatpost and TT saddle and leave it at that until you are placing somewhere mid-upper pack.
Last edited by Brian Ratliff; 03-12-11 at 12:43 PM.
Cat 2 Track, Cat 3 Road.
"If you’re new enough [to racing] that you would ask such question, then i would hazard a guess that if you just made up a workout that sounded hard to do, and did it, you’d probably get faster." --the tiniest sprinter
Does anyone know a source for aluminum TT frames? Leader seems to have hit the wall.
i just bought an aluminum 2009 jamis trilogy for a song. they discontinued them in favor of thier carbon line.
its a really sold entry level TT bike with some nice features like nice aero tube shapes, concealed brakes, decent easton vista SL training wheels, rear dropouts in the back for adjustable wheelbase.
anyone know if it possible to rent a zipp 1080 front wheel? i only need it for one race and I am trying to decide what is the most cost effective way to get one for the race
Got a few questions:
-Can someone shed more light on what's a good aero-bar? I assume the base should be shaped like an air-foil. What else should i look for and at what point is it "too heavy?" I may just slap one onto my road bike for a few TT's this summer.
-The newer bikes such as high end Scott, BMC, and Felt have the "integrated" stem which covers up quite a bit of the rough surfaces. How big of a difference do they make?
-Also, as much as i dislike ergo bend bars, 3T makes the Zefiro with integrated arm rest. What are people's take on these and would i get as much a time saving?
Here's Davie Sprockets on them
For the TTT, it was 12 seconds from braking to first pedal motion and 20 seconds to get fully up to speed. It helps that the lowest speed through the turn was 12mph.
Still need to work on both, obviously.
hmmm - re-reading this thread reminds me that I need to take another hard look at my cable routing.
Leaving enough cable for positional adjustments meant I had lots of stuff flapping in the wind - position is much better now, so I gotta trim/secure/shorten all that stuff.
I definately have this.
There is an optimal temperature at which I have more power and then there is either too cold or too hot.
I'm pretty sure it has to do with oxygen in the air and also with the body heat regulation system consuming energy.
Also: do not eat a huge bag of fries with mayonaise just before you ride out!
Was reminded yesterday about how important little things are. I did two back-to-back training runs in preparation for an upcoming 8.5 km TT. The section of road I used went 6 km in one direction, a turnaround, then 2.5 km back; it's basically flat and has heavy trees on both sides of the road, so the air is quite still. I rode back to the same start point for the second run.
The first run was marred by two moments where (due to traffic), I had to stop pedaling for 2-3 seconds, brake a tiny bit, then stand up to hammer back up to speed. On the second run, my turnaround was noticeably smoother and faster. In every other respect, the two runs were as identical as I could make them.
So here's the kicker. The first run had an average power of 267W; on the second, it dropped to 250 (only 10 min rest between the two). However, the average SPEED of the second run was .1 mph FASTER than the first one. That is, two short bobbles and a slow turnaround were enough to erase a 17 watt difference in power. Per the power calculator, the first run should have been 20 seconds faster, not 2 seconds slower! Food for thought.
Originally Posted by waterrockets
Thanks for the link to that power calculator, forrest_m ... handy tool
McJimbo, what do they mean by "covered 30 mm alloy rim" in that graph?
It seems to be on par with the zipp wheels and even outperforms them at 20 degrees.
Last edited by AdelaaR; 05-15-11 at 08:46 AM.
It's a plastic disc cover on an aluminum rim. Note that the publisher of the data is the manufacturer and retailer of the cover: wheelbuilder.com
mmm ... those covers do seem interesting indeed.
Offer the same aero and about the same weight at a fraction of the cost.
Anyone got some experience with those things to share?
road bike, clip-on's, wheelbuilder disc cover, giro advantage 2 helmet, skinsuit and shoe covers.
Putting the Duh in Floriduh.
I'm just wondering. There is a TT held in the area every year and I wondered how I would do in my age division. Next year, I can enter the "walking cane - grandfather's" division and this morning I went out with my road bike to ride the course. Just wanted to see how competitive I would be, (or how much I stink), by comparing my time today with last year's posted results. I also rode a couple hours later in the day than my division would ride, so the wind was a factor in my time, (but for now, we can disregard that factor).
Just in general, as a wild approximation, over the course of a 23.2 mile, (37.3 km) ITT, assuming the same level of effort as today, how many minutes do you think I could deduct from my time today if I were riding a TT bike with a skin suit, aero helmet and shoe covers, (and sans a round water bottle and the "wipe my forehead" rolled up rag in the other bottle carrier)?
(I've ordered an entry-level TT bike, for general fitness purposes, but would like to know if I should seriously consider training for an ITT. If I could finish in the top half, I'd be satisfied.)