cedricbosch

I have a short prologue TT coming up and I'm debating between my powertap and a 404 rear wheel. I'll run a 404 front wheel regardless. If I use the powertap I can stick to my 10-minute threshold power until the last 2K's or so. Which would you use and why?

Frunkin

I just did a 5 mile TTT with my powertap and I looked at it maybe 2 times. I think you can pace yourself pretty well off RPE and the aero benefit may be the difference in what will be some very close finish times.

But i'm no TT expert so take it fwiw.

uspspro

Aero wheel and use HRM (not as good as power, but it works).

or if it's not a UCI event...

Disc wheel cover on your PT wheel.

borg

PowerTap. Until you are paid to ride, improvements are more important than individual race results. The power file will give you great insight as to where you can improve. I just can't live without the data.

I am assuming you are not paid to ride or you would be asking between the Zipp 1080 PowerTap or the Zipp 808 PowerTap to use for your rear

ldesfor1@ithaca

Also a +1 for a wheelbuilder.com disc cover for the rear. I have one for my open pro powertap wheel and it is very, very fast compared to the box section alone. If you have time and $80 this is a great option. Otherwise i'd go with the PT as the data itself may be worth the (?) seconds saved with the aero wheel, not to mention the pacing should be much better!

-L

PhillyRoadie

I did a 2.7 mile TT last weekend, and I really wish I'd had a powertap. I was surprised at how hard it was to pace something so short, in all the nerves and adrenaline of race day.

A HRM probably isn't going to be that helpful (when the whole event's going to be over in six minutes, is it really helpful to know how many bpm over your LTHR you are?) Even if you actually adjusted your pace based on that, you'd probably be done before your HR rose/fell accordingly.

waterrockets 

Yeah, I think that if you can use it to prevent you from screwing up your pace, the PT will save you much more time than it will cost you in such a short event. Then you have the benefit of the data for later.

cslone

Pacing is for wussy.

My vote would be a PT with disc cover if possible though.

nitropowered

Data, Data, Data!

wfrogge

PT for the data AFTER the race. Theres no way I would pace myself by watts for something that short.

merlinextraligh

Quarq, and you don't have these issues.

Racer Ex 

404 or get a cover. The time gaps on a short TT like that are going to be a few seconds, which you'll be tossing away with the PT wheel. Losing places or a win by a second or two is not pleasant.

Go pre ride it (or something similar) with the PT at race speed to get a feel for where you start to crumble. Other than reigning in a little during the first minute, the last one of these I did I didn't pace, I slobbered and was just going as hard as possible.

Nate552

Do you have a chance to do well? If so, the 404, in a distance that short every second will count. Or a cover like everyone else says, though I have no personal experience with them.

cedricbosch

Do you do time trials on your road bike?

merlinextraligh

No. The TT bike has a compatible BB. So it's a 5 minute operation to move the crank with the Cinco Saturn from the road bike to the TT bike.

waterrockets 

Yeah, if you can dial in your pacing before hand, even on a different but somewhat similar course, then you won't need the few glances at your power meter during the event. Going into it blind, I think I'd do myself a favor with the PT though, because I'm likely to stay at 500W too long in the beginning, then fall apart and come in at 320W. Practice runs will quell this though.

ElJamoquio

Nothing compares to race-day adrenaline. If you can pace it, great.

Basically you're gambling a 'guaranteed' 5-10 seconds of advantage with the better wheel, vs. 30-60 seconds from going out too hard and blowing up.

Racer Ex 

2.5 with the SRM.

cslone

It's only a 1 bolt swap if you have a compatible bb in your 2nd bike. 2 minutes 29 seconds max.

KendallF

I did the Albany 3.1k TT Saturday with my 101mm Planet X PT wheel. I think I looked at the numbers once and said, "Oh sh*t, I'm at 450 watts, can't keep that up". The rest of the time I was busy yelling at people to get off the course, turning, or sprinting back up to speed. I haven't looked at the data yet, but I am pretty sure I went out too hard. Will I use that data to moderate the next one?

Maybe.

Edit: I forgot, I had to dodge the ambulance too.

Racer Ex 

2.5 with the SRM.

I couldn't pace a TT of this distance, and I'd ask how many people suggesting pacing off a power meter for a prologue have successfully raced one. The one I did last year I won by 3 seconds at 397w average, that's a pretty jumpy number if you're trying to hold it steady.

I'd be genuinely interested in seeing the file. Interestingly, I looked at Gustov Larson's file from the TOC prologue, it's surprisingly similar to my effort, albeit at a much higher wattage. Steady trend downward then up in the last minute.

Given that you should be dancing on the fine line of complete meltdown, I think paying attention to internal markers (breathing, lactic buildup) is much more helpful than trying to sit on a number.

cedricbosch

I think I'm going to get a disc cover for this event. I know it probably isn't worth it just for one event, but I want to get the data from this to better evaluate my 10-min threshold (least favorite test.) Also, I have a few longer TT's coming up where the pacing of the powertap combined with the aero-ness of the disc cover should come in handy.

merlinextraligh

$59 https://www.excelsports.com/new.asp?p...jor=1&minor=24

cslone

I definitely think that something this short is going to be balls to the wall, more based on RPE than anything. But if he can get a cover and use the PM to look at afterwards to see how pacing strategy went, it's always nice to have those numbers.

cedricbosch

I'm getting the one from wheelbuilder.com because they can trim it to fit my wheel.