UT_Dude

Yeah, I'll resize the picture in a bit. It shows up fine on my monitor, but yeah.

I figured it was a more useful example since it doesn't spike at the beginning and gradually ramps up starting at the turnaround.

transplant

question: approximately what percentage of FTP do you loose going from the hoods to a TT position?

Edonis13

leg hair and aerodynamics.

discuss.

ElJamoquio

From each step - the hoods to the drops; and then from the drops to the bars, I lose about 5-8%. So, give or take, for me, I loose about 10-16% of FTP.

This is on the high side, and I'm working to converge the two numbers through stretching, longer rides in the bars, etc.

Kris Flatlander

So DrWJO what's this one type of shoe cover that works the best? Curious minds want to know.

gsteinb

You seem to have left off the part about women weakening legs.

justinb

It seems that when people go to the wind tunnel, it's always with a TT frame, aero helmet, disc, etc. I'm sure most that can afford that have already decided to spend on equipment, and they're just refining their position.

Does anyone have published figures to show how much more drag is created by a non-TT frame with normal wheels, normal helmet, but a decent body position?

DrWJODonnell

Perhaps Jim Martin's research is what you are looking for?

justinb

Yes, yes it is. Thank you.

phlegmon

Second that on which tt booties work. Please share.

banduhbiker

Well given he is wearing the Pearl Izumi booties in his latest post, it could be safe to assume that they are "the ones"

DrWJODonnell

And all year. We have a winner.

phlegmon

Thanks. Just ordered a pair. That should give me the 40 seconds I figure I'll need to keep my jeresy this year.

Talked to your coach at BBC race last weekend. He was (righty so) bragging on you a bit.

Dalai

May I ask which version? The PI Aero Shoe Cover or the Wind Shoe Cover?

HillMut

Not sure if this belongs in this thread, but any information/insight on TT frame sizing??

UT_Dude

Yeah. Don't ask on the internet. Go to your LBS and GET FIT IN PERSON!! A lot of people will advocate dropping a size or two from your road bike, but honestly, everyone's different, and the only way to tell is to go get fit in person.

ElJamoquio

...and do you have any write-ups to reference? Was this discovered at your wind tunnel experience?

DrWJODonnell

Wind Shoe covers. The rubbery ones. Wind tunnel experience. Mine and about four other guys.

Dalai

Thanks! Was hard to tell from the latest pictures you posted. Just putting in the order now

Kris Flatlander

DrWJO should get a commision here

OC Roadie

Question on pacing strategies:

I understand and have experienced the benefits of negative splitting, starting a little easy, and building the effort as I go, but it's always been by perceived effort and sometimes HR. I've finally gotten off my lazy ass and set up my SRM on the TT bike. Do you guys have a certain formula for your pacing? i.e. 90% FTP for the 1st third, FTP for the 2nd, and 110% or what ever is left in the tank for the 3rd? I'm curious how much you find you need to hold back, without holding back too much. Obviously, this will vary and I need to find what's optimal for myself, but I could use some starting grounds.

UT_Dude

It's going to depend a lot on length of the TT. Your FTP is probably different on your TT bike than it is on your road bike, too, so I'd check into that, maybe do some field tests or something.

From experience, I know about what I can do on the TT bike for 10 min, 20 min, 40 min, and an hour, which seems to cover most TT's. When I start, I go a bit under that under (depends on the length again) for about the first half. The next 1/4, I'll usually go just a bit above the number (depending on how I'm feeling), and for the last 1/4, it's pretty much just all out.

Again, you kind of need to experiment and find out what works for you, though. Local practice TT's are muy bueno!

OC Roadie

Thanks UT-
After I posted this, I was thinking that my FTP, would probably be lower on the TT bike. For the purpose of discussion, assume I'm talking about a 40k TT, so ~52-60 minutes. I will play around with the pacing for sure, but before I get a chance to, I've got a District Champ 40k TT coming up a week from Saturday. Mostly I was looking to see if anyone had worked their pacing down to a science, or if it's just "don't go out too hard, and keep ramping it up".

DrWJODonnell

Opinion: For me it's not a science, but I usually split 1/3's and go 10 below target, 10 at target and FTW for the last third.

UT_Dude

That's usually about what I do as well. Although, the longer the TT, the flatter the pacing. My 2x monthly TT I run a lot closer to that strategy, than I do a 40k, where it's more like 5 under, at target, and 5+ over.