Bike Forums

Bike Forums (https://www.bikeforums.net/forum.php)
-   "The 33"-Road Bike Racing (https://www.bikeforums.net/33-road-bike-racing/)
-   -   Racer Tech Thread (https://www.bikeforums.net/33-road-bike-racing/956936-racer-tech-thread.html)

Duke of Kent 07-10-15 01:55 PM


Originally Posted by tetonrider (Post 17968617)
new pricing on the SRMs. i just got it yesterday.


how do you define flawless? no drop-outs or battery issues, or....gives reliable data?

I like the idea of the Stages if it was, like, $300, but what bugs me is that it is not a cheap device and is 1/2 a power meter. Even putting the issues aside w/r/t situations where cadence is changing abruptly/shorter efforts, because of all our individual peculiarities power balance is not constant and their 'multiply-by-2' simplification is flawed. (That it is not constant does not matter for crank- or hub-based devices.)

So, there are multiple sources of error, and for power (IME/IMO) that is not a good thing. You can't calibrate it, the variations in time/balance are non-linear, and then, of course, the standard chance of error that EVERY meter has. It's just too much, IMO, for that cost.

For $250, $300 I have a different take on it, but at around a grand I go used with another device. Time will tell, but for me a device that costs 1.5-2x but lasts a decade is worth more than the device that costs x but is a paper-weight far sooner.

I also have a different take if they start measuring both sides...but then I suspect we bump up the cost and longevity questions rear their head.

Good points. My Stages hasn't had any dropouts or battery issues. Data reliability? Aside from some nasty rock strewn downhills where I've had some 3,000w spikes, it's been "good". If I hit Dirt Road Climb X in 10min, it says 350w damn near every time.

I'm not super anal about my racing or off road data; on even smooth single track it jumps around enough that you'd have a hard time knowing what was real and what was noise. On dirt roads or paved roads, though, it's consistent.

gsteinb 07-10-15 02:04 PM

I don't know. I'm not sure there's value in an all or nothing approach. So when I need to replace or get an additional power meter (compact) I'd be more likely to try something a lot of people are using than just not getting anything. Ymmv

tetonrider 07-10-15 02:08 PM


Originally Posted by Duke of Kent (Post 17968749)
Good points. My Stages hasn't had any dropouts or battery issues. Data reliability? Aside from some nasty rock strewn downhills where I've had some 3,000w spikes, it's been "good". If I hit Dirt Road Climb X in 10min, it says 350w damn near every time.

I'm not super anal about my racing or off road data; on even smooth single track it jumps around enough that you'd have a hard time knowing what was real and what was noise. On dirt roads or paved roads, though, it's consistent.

IME off-road (MTB & cross) with power meters, it is impossible to tell from an activity whether the data was reliable. that's why we calibrate. we do have to make a leap of faith--as you know from seeing that off-road data, it's not like you just settle into X watts on a rocky climb for 10 minutes.

and that's the bummer about devices that cannot be calibrated by the end user--noise on top of an unknown.

tetonrider 07-10-15 02:13 PM


Originally Posted by gsteinb (Post 17968773)
I don't know. I'm not sure there's value in an all or nothing approach. So when I need to replace or get an additional power meter (compact) I'd be more likely to try something a lot of people are using than just not getting anything. Ymmv

when you wrote this:"I'm most sick of spending huge money on my hobby. I'd actually be surprised if I didn't buy a stages soon and eventually move over entirely."

i interpreted "move over entirely" as "I'm looking at selling all I have and buying a Stages."

sorry if i read too much into it or misread it.

i put my money where my mouth is, but since you brought up the money concerns i pointed out there are even cheaper ways to go about it.

someone was bound to trot out the 'eddie mercx did just fine without power' element. and there is some truth to that, esp for a guy with your training experience. of course, it is difficult for your remote coach to know what the hell you're doing....

TheKillerPenguin 07-10-15 02:17 PM

Aside from my head unit I really love my powertaps. The drawback is that I can't just go and buy a new wheelset, but the plus side is it keeps me from buying extra wheelsets.

globecanvas 07-10-15 02:27 PM

I have no interest in "what is the best X" conversations in general, but I'm just going to throw this out there. I can swap my SRAM Stages between any of 4 bikes in less than a minute. I do it several times per week. It takes less time than pumping up the tires or filling up a water bottle. I'd never buy a dedicated power meter for every bike, but it is awfully nice to always have power.

Wylde06 07-10-15 02:32 PM

Ive considered getting a stages for my TT bike. I can get them at a nice discount through my team shop.

Doge 07-10-15 02:56 PM


Originally Posted by globecanvas (Post 17968841)
... can swap my SRAM Stages between any of 4 bikes in less than a minute.

How do you do this - just remove the arm?

vision646 07-10-15 02:56 PM


Originally Posted by globecanvas (Post 17968841)
I can swap my SRAM Stages between any of 4 bikes in less than a minute. I do it several times per week. It takes less time than pumping up the tires or filling up a water bottle. I'd never buy a dedicated power meter for every bike, but it is awfully nice to always have power.

This is also a big reason why I got a Stages PM, I swap it at least twice a week and can put it on any of my three bikes.

vision646 07-10-15 02:57 PM


Originally Posted by Doge (Post 17968935)
How do you do this - just remove the arm?

Yep you just swap the left arm over.

globecanvas 07-10-15 02:58 PM


Originally Posted by Doge (Post 17968935)
How do you do this - just remove the arm?


Yes, which is a single captured bolt on SRAM cranksets.

Doge 07-10-15 02:59 PM


Originally Posted by vision646 (Post 17968938)
Yep you just swap the left arm over.

Do you keep the bikes you are not riding with the left arms off?
Seems that left pedal gets lots of use.

Ygduf 07-10-15 03:00 PM


Originally Posted by tetonrider (Post 17968725)
i think we all make a choice to be somewhere along that continuum, in any area (even shoes!). .

Is that the shoes joke? See, I really didn't get it because those are the cheapest custom shoes I could find. I get serious hotfoot (that really does impact my racing) and I had to try something after I missed out on top 7 at copperopolis after choosing to not go with a small chase because I couldn't pedal continuously. Anyway, my feet are 130mm across at the ball, probably more when I have been riding and they swell, so I caved in after 4 years to get semi-custom shoes. I sent measurements and pics, never got the full casting done. This most recent (2nd pair, after 15k+ miles on pair 1) purchase was because the dials on the top (where new shoes have straps) kept failing on me. I was pissed, the maker knows this, but because I loved everything else about the shoes I had the guy make me a new pair with the strap instead.

If I could have gotten a wide enough pair of Lake, or a wide enough and high-volume version of Bonts for 1/2 the cost I would have. I have the emails to prove it.

globecanvas 07-10-15 03:02 PM


Originally Posted by Doge (Post 17968945)
Do you keep the bikes you are not riding with the left arms off?


Yes, generally, unless I expect to be moving the bike around or washing it or whatever, in which case I spin the original crankarm back on just so the crankset doesn't slide out.



Originally Posted by Doge (Post 17968945)
Seems that left pedal gets lots of use.


True. Full disclosure, 2 of the bikes have MTB pedals on so depending on the swap, I might have to swap the pedal as well, which takes another 30 seconds.

furiousferret 07-10-15 03:06 PM

There was a time on this forum when people with feet abnormalities could come here and not worry about hate, but instead have to write 2 paragraphs to justify shoe purchases!

vision646 07-10-15 03:17 PM


Originally Posted by Doge (Post 17968945)
Do you keep the bikes you are not riding with the left arms off?
Seems that left pedal gets lots of use.

I don't simply so that dust/grit doesn't accumulate on the greased spindle, I live in the desert so there is always dust in the air. And yes the left pedal does get more use and recently I had the thought that it seemed a tad too easy to unclip on the left side. I'll finally add a couple of clicks of tension to my +4 year old 105 pedals.

Ygduf 07-10-15 03:19 PM


Originally Posted by furiousferret (Post 17968964)
There was a time on this forum when people with feet abnormalities could come here and not worry about hate, but instead have to write 2 paragraphs to justify shoe purchases!

just for that I'm going to post a picture of my feet later tonight. hammer toes, shaped like a beaver tail, arch like a roller coaster first drop!

Duke of Kent 07-10-15 03:19 PM


Originally Posted by Doge (Post 17968935)
How do you do this - just remove the arm?

That's how I did my Stages vs. SRM comparison.

Took my 170mm Hollowgram crank arm off my MTB, put it on my road bike.

In theory, I don't even need the SRM on my road bike, but I got it for $100 more than a set of Cannondale Spiderings would have cost on eBay. Imaculate condition, too. And, I hate removing cranks on BB30 bikes once I get bearing preload dialed in.

gsteinb 07-10-15 03:20 PM


Originally Posted by globecanvas (Post 17968954)
Yes, generally, unless I expect to be moving the bike around or washing it or whatever, in which case I spin the original crankarm back on just so the crankset doesn't slide out.





True. Full disclosure, 2 of the bikes have MTB pedals on so depending on the swap, I might have to swap the pedal as well, which takes another 30 seconds.

when I take the pedal off it takes me five minutes to bandage my hand from slamming it into the chain ring.

maybe this is an ill fated idea.

spdntrxi 07-10-15 03:23 PM

I got the vectors and stages.. Sold my PT.. I was concerned with L/R BALANCE after left knee surgery . Turns out my left leg does a majority of the work .. Usually 52/51 % . I was swapping wheels too often to justify the PT so it made little sense to keep it. I have been happy with my stages and vectors

gsteinb 07-10-15 03:28 PM


Originally Posted by tetonrider (Post 17968797)
when you wrote this:"I'm most sick of spending huge money on my hobby. I'd actually be surprised if I didn't buy a stages soon and eventually move over entirely."

i interpreted "move over entirely" as "I'm looking at selling all I have and buying a Stages."

sorry if i read too much into it or misread it.

i put my money where my mouth is, but since you brought up the money concerns i pointed out there are even cheaper ways to go about it.

someone was bound to trot out the 'eddie mercx did just fine without power' element. and there is some truth to that, esp for a guy with your training experience. of course, it is difficult for your remote coach to know what the hell you're doing....

I like data. I'd probably never ride without data again. But I also question the need for absolute perfect data at a significantly higher cost. Enough guys are using Stages that make their living from this stuff that I figure if not already, certainly soon, it'll be in the 'good enough' category. I would not sell my SRMs if it was something like an even swap for a stages. There's no value in that, and for all the talk about SRMs holding their value it's sort of true but not if they're relatively new. You can get good cash out on the back end, not so much if you need a quick sale. I can get a pretty good discount on Stages, and nothing lasts forever so my SRMs are bound to die sometime and I really need a compact at some point.

tetonrider 07-10-15 03:49 PM


Originally Posted by globecanvas (Post 17968841)
I have no interest in "what is the best X" conversations in general, but I'm just going to throw this out there. I can swap my SRAM Stages between any of 4 bikes in less than a minute. I do it several times per week. It takes less time than pumping up the tires or filling up a water bottle. I'd never buy a dedicated power meter for every bike, but it is awfully nice to always have power.

i can swap specialized cranksets in about a minute. it's a small dust-cap and one bolt.

funny story: a friend bought a vector ~18 months ago because he was not a very good mechanic and afraid of swapping cranks. (i get it--the SEEM mysterious.) we both flew to a stage race. as we're building bikes, i notice he has his crank off. he realized the vectors were a PITA to install and get right (for an average traveling mechanic) that he found it easier to just pull the cranks.

that was before he experienced numerous issues like having a TT where 1/2 the power dropped out, etc., and dumped them.

anyway....

for swaps, PT is probably the easiest but doesn't work so well between MTB & road! :)

otherwise, a crank arm vs a crank is pretty much a non-existent gap for most competent mechanics. pedals seem easier (but in practice many people have trouble even with ANY pedal removal) and maybe the new ones will prove to actually be easier. 'right-tighty' fails many otherwise intelligent people w/r/t pedals, though, power aside.

no road bike mechanic stuff is complex, but some is intimidating at first. kind of like installing ski bindings.

tetonrider 07-10-15 03:52 PM


Originally Posted by spdntrxi (Post 17969008)
I got the vectors and stages.. Sold my PT.. I was concerned with L/R BALANCE after left knee surgery . Turns out my left leg does a majority of the work .. Usually 52/51 % . I was swapping wheels too often to justify the PT so it made little sense to keep it. I have been happy with my stages and vectors

right--but i think L/R, at least now, is pretty much a novelty in that what do you do with that info? there's nothing that's been shown that a 52-48 balance (or even more extreme) has any impact in a more broad sense.

i for sure would LIKE IT (and wish i had it pre- and post-injury, out of curiosity), but there is nothing to really do with it.

1-leg drills are not a thing that is useful for training (unless people are talking about using a counterweight, which most never seem to do).

tetonrider 07-10-15 03:52 PM


Originally Posted by gsteinb (Post 17968999)
when I take the pedal off it takes me five minutes to bandage my hand from slamming it into the chain ring.

maybe this is an ill fated idea.

road->road swaps = leave the pedals on.

chain in big-ring helps a bit. :)

globecanvas 07-10-15 04:03 PM

People should buy whatever meets their needs and use cases and budget, I'm not selling anything or saying people should get what I have because I like it.

Just to illustrate my own use case, the 4 bikes are: a road bike with compact crank, cross bike with narrow-wide single ring on 130 BCD, winter bike with single ring on 110 BCD, and single speed with frankenstein 40/42 rings on 110 BCD. 3 of the bikes have disk brake hub spacing. 2 of them use MTB pedals. As far as I know there is no other single power meter that could possibly be swapped between these bikes. That the swap can be done so easily is a bonus. Power for all 4 bikes for $600 or whatever my sponsor shop charged me is a ridiculous deal.

Others will have different use cases.


All times are GMT -6. The time now is 07:30 AM.


Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.