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Garmin Vector S User's Unite

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Garmin Vector S User's Unite

Old 05-26-15, 06:37 PM
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Garmin Vector S User's Unite

I use a Garmin Vector S as my only power feedback. I chose the S (single sided) version due both to cost and the fact that my right side clearance is on the edge of the published 5mm requirement.

While I only get 'one sided data' (final data assumes the left side and right side power are the same at all times), this is mostly good enough for me. I feel comfortable assuming that a measured (one-sided) 'Whatever Watts' ftp increase is probably about 'Whatever'. It is certainly good enough to detect improvements in peak power, differences in average power between rides, good enough for TSS calculations, etc.

But like (I am guessing) many Vector S users I am left wondering "just how accurate are the absolute numbers?". From what I have read a 45/55 balance between left and right would not be unusual. So if you have a reading of say 250W, going from 45/55 to 55/45 means that your actual power output was somewhere between 225W and 275W. Not very satisfying, although fine for comparative measurements.

All I really want to do is take a couple of rides with two-sided data just to get a feel for 'my sidedness'. But this isn't a $699 problem (list price of the upgrade to dual sided pedals). It would really be nice if somewhere out there was a Vector S upgrade pedal that you could rent. Anyone ever heard of such a thing? It seems like a natural.

I have also considered waiting for a used upgrade kit to show up on ebay (not so common, although one was sold recently). I could buy it and then resell for a net cost probably similar to a rental fee.

Thanks.

dave
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Old 05-27-15, 10:37 AM
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This is one of the reasons I got the full Vector kit.

There's a shop in town that rents power meters, you might have one near you. While you aren't likely to find a right pedal (or full set) to rent, you could find your total power with a PT wheel or other sensor, and compare that to double your Vector minus drivetrain losses to get a pretty good idea what your L/R balance is like.

At the end of the day I think you're right that it doesn't really matter. Unless you have an injury that affects one leg or foot, the trends should be reliable.
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Old 05-27-15, 07:23 PM
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That is an interesting thought. If I could borrow/rent a rear wheel with a PowerTap and also borrow a second 'head' (such as another Garmin 800 edge) I could generate two simultaneous power files for comparison purposes (and I would have to account for additional powertrain losses in the PT case). That could possibly be doable.

The complicating factor is that I run a Campy Chorus (11sp) RD, but I understand that Campy and Shimano 11sp are virtually interchangeable (Campy being not so common here in the eastern US). Interesting.

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Old 05-27-15, 10:00 PM
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Originally Posted by DaveLeeNC
But like (I am guessing) many Vector S users I am left wondering "just how accurate are the absolute numbers?".
There are ways to tell but they're a fair amount of hassle. If you don't need to do it (and most people don't) it's probably better not to waste that effort.
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