MDcatV

you can set the pt in cyclocomputer mode and use it as such with a magnet on the rear wheel that the sensor will pick up

bitterken

crap, now i'm really tempted...

Jynx

I understand the mistake I made in that post. What I am trying to get at is you can have a constant hub speed and constant torque at the hub but with varying RPM's.

That would change the power correct?

tanhalt

No...sigh...if you have constant hub speed and constant torque at the hub, then by definition the POWER is constant as well, both at the hub AND at the crank.

With constant power, if you increase the cadence, the pedal force goes down, and vice-versa.

Power = Force x Velocity. Period.

tanhalt

Trust me...once you get a powermeter, you're not going to want to race without it.

Even if you don't use it during the race, it's VERY valuable to be able to see how you actually perform in race situations...

But, has been said above, with a "harnessed" PT, you can just put it into "cyclocomputer mode" and a magnet mounted on any wheel passing the receiver will trigger the speed and distance readings.

Hmmm...I guess that's one advantage that the "harnessed" model has over the "wireless" models...you can't do that with a fully "wireless" model. In my mind, that would actually put this particular model as a better value than the more expensive (and heavier) bottom line fully wireless models....interesting...

MDcatV

aside from looking at a post race file, I've not found mine of use during a race.

in fact, I built a 303 w/pt hub for racing, and was thinking about removing the pt hub, putting the zip hub back in, and building another trainer wheel so I dont have to change tires to go from indoors to outdoors (stuff we have to consider less friendly winter climates).

nafun

My hub cadence reading seems considerably worse. I've only used it once (got the PT Pro+ in yesterday), but this morning it varied from +5% to +50% above my wired computer with crank sensor. Most of the time it was in the upper end of this range, around +35%. I would often be pedaling at 86rpm by crank sensor with the PT reporting 120rpm.

All other data from the PT looked contiguous and reasonable, so i don't think there were any transmission problems.

I do engage my hamstrings quite a lot on the back stroke, so maybe that is confusing its calculation. The reading got much better when i only pushed on the down stroke instead of my usual pedaling style. In any case, this amount of error and uncertainty makes the cadence reading useless for me.

wfrogge

Its a power meter not a speedometer.... Data would be most useful post race for reivew.

ericm979

The hub cadence is entirely useless for those of us who rarely produce anything but lower watts.

Psimet2001 

Nah...I find it to not be useless and I'm a wussy.

tanhalt

Even if there was zero error in the reading...I still wouldn't find much use in it

nafun

That could well be my problem...

merlinextraligh

Its your smooth pedal stroke that's the problem.

KendallF

I must stomp like a mofo, then. Mine seems to be quite accurate, at least steady state. The only thing I ever use it for is to remind me to spin when I'm warming up.

Tree

If you need a Campy freehub THIS is a smokin deal for a wireless PT.

Edit to add: THIS is not a bad price for a matching front either.

Dubbayoo

The new low end PT unit is not ANT+ compatible. I'd hold out for the Power Tap Pro+.

tanhalt

Personally, the fact that the ANT+ compatible PTs move the autozero function into the hub and it only functions when you're stopped (as opposed to the old way of zeroing when coasting) is IMHO a big disincentive to get an ANT+ compatible PT model...

Electric_Elvis

I got a response from CC about the HR, looks like it will record HR data, you just needed a coded strap.

Checked the description on the website and they updated it to reflect this!

pjcampbell

I would not bother with wired PT.

JMO.

irish pat

I have had no problems with the wired Powertaps, they all come with a coded heart rate strap now as well.

Much better bang for buck IMO.

Psimet2001 

+1. I hated the idea until I got one. The only drawback being extra mountings, but they seem to be pretty easy to get on ebay and through QBP.

I have an old Pro (black plastic cover) and the only thing I don't like is the weight. It's a pig.

I have also heard bad things about it's ability to withstand water. Not looking forward to finding that out seeing as how I ride in the water a lot.

tanhalt

Well...in actuality, they all are wireless transmission...it's just that some happen to have the receiver out on the end of a harness instead of inside the head unit

irish pat

I have ridden mine in water/rain, but I don't make a habit of it. I have two of the older ones, I keep one on the trainer and one on the CX bike, as it gets warmer out I will move the one from the trainer to the road bike. I took off the plastic cover and sealed it with some silicone, it has kept it dry so far.

I really cannot justify buying a newer one or even upgrading either of the two I have, It is a training tool-more of a tool than any other part of my bike.

I don't race with it, but I did do two races on it, I, personally get no benefit from racing with it as I don't have a coach to analyze my results.

Scummer

Crap... the temptation was too great. I couldn't stand it anymore. I ordered one.