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 Post subject: Stages SRAM weight..
PostPosted: Tue Jul 15, 2014 6:34 am 
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Joined: Sun Mar 16, 2014 3:09 pm
Posts: 99
Location: Seattle, WA | Gjøvik, Norway
I rode a quick test ride with my new Stages PM and it works... That's all I can say for now about the functionality before I start learning how to use it and analyze the data better. The biggest drawback from a ww perspective is that the SRAM Rival crank arm is a beast at 210g + 20g for the Stages PM ( = 230g total). The SRAM Red arm that it had to replace is 135g. So for SRAM Red owners, the Stages weight penalty is 95g and not 20g.

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 Post subject: Stages SRAM weight..
Posted: Tue Jul 15, 2014 6:34 am 


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PostPosted: Tue Jul 15, 2014 11:26 am 
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Joined: Sun Jun 12, 2005 10:56 am
Posts: 2650
Location: New Zealand
My quarq has crapped out twice in 8 months....both times on wet rides (though the local distributor said it wasn't water ingress).
Good things:
-it's easy to replace a battery.
-Pretty light.
-Looks good (my opinion)
-good replacement (second time was over the weekend)
-data is consistent and decent once you use a qualvin app and a known mass.

Bad things:
-2 breakdowns.
-each time it's been sent back, it's been miles out from accurate and needed re-calibrating using Qualvin to get it sorted (which would be a pain if my coach didn't have that stuff and an obsessive hatred of inaccurate data, so I CAN get it fixed promptly).

I may just be the least lucky person in NZ with Quarqs but it has severely tried my patience as each breakdown has coincided with a holiday period starting (i.e. when I'm likely to do some serious K's!!)....second one was recent and really caused a temper tantrum.

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PostPosted: Tue Jul 15, 2014 11:54 am 
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Joined: Fri Nov 14, 2008 4:55 am
Posts: 455
Another specialized SRM user here in standard BCD - lightest SRM I have used. Not a whole lot of weight penalty for the reliability and getting to use cranks I wanted.

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PostPosted: Tue Jul 15, 2014 4:56 pm 
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Joined: Tue Nov 11, 2003 9:47 pm
Posts: 1804
Location: Santa Cruz, California, USA
I think the Quarq numbers are questionable at best. They're no longer available on FSA cranks, so I suspect that weight was the previous generation unit.

The standard Quarq Riken these days is Sram crank based and weighs 739 for GXP and 733 for BB30g. The comparable Sram Red crank is 609 in GXP and 557 in BB30.
The difference is 130g GXP, 176g for BB30.

Neither of my Quarks have broken or lost accuracy yet. But it's only been four years for the older one.


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PostPosted: Tue Jul 15, 2014 7:37 pm 
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Joined: Wed Sep 26, 2007 1:57 pm
Posts: 7371
Location: San Francisco, CA
On the subject of Stages, or the new left-only Rotor... I get L-R balances like the following very reliably with Vector:

Image

Measuring just the left side would thus result in a significant power error in the low-power range.

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PostPosted: Tue Jul 15, 2014 8:15 pm 
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Joined: Thu May 04, 2006 4:43 pm
Posts: 5096
Location: Wherever there's a mountain beckoning to be climbed
Then go with Stages or the left-only Rotor. Your all-important high-end power* will increase. :beerchug:

* as indicated by the multiply left-side power by 2 algorithm, ha ha

Edit: For NiFTY's benefit, at the very highest power shown on the graph, djconnel's right leg percentage tends to be below 50, therefore, his left leg percentage tends to be above 50, so doubling left leg percentage will overstate power, hence his <indicated> power will increase by use of a left-leg only power meter. QED.


Last edited by HammerTime2 on Fri Jul 18, 2014 7:20 pm, edited 1 time in total.

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PostPosted: Fri Jul 18, 2014 4:55 am 
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Joined: Sat May 26, 2012 11:26 pm
Posts: 482
Actually Hammertime calculated power will decrease for djconnel. I have a Quarq which estimates balance and mine is normally 48-49% L and 51-52% R. I know that my FTP set on my quarq is going to be slightly higher than that on my stages. Does 1-2% really matter, not really. Power fluctuates a fair bit on any real road surface so trying to hold a wattage to a single watt is almost impossible. I also don't stare at my stem with the intensity of Froome so a general band of band of watts +/- 10/15 of target is my goal. Now I am waiting so someone to say that on their SRM they sit on exactly their target wattage within 0.5W and notice no fluctuations over a regular road as they have their legs so well tuned to road irregularities. Activate powermeter trolls now.

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PostPosted: Mon Jul 21, 2014 11:09 pm 
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Joined: Tue Jan 17, 2012 4:01 pm
Posts: 136
Location: Downtown Los Angeles, CA
Here's another way to look at it: as a complete drivetrain:

SRAM Red 2013 Quarq - 793g
HSC BB w/o Sleeve - 81g
Speedplay Ti Zeros - 164g

Total = 1,038g
Price = $2,000 + $110 + $335 = $2,445

THM M3 SRM w/ FSA Compact Rings - 698g (cyclingtechblog)
THM English BB - 72g (according to Fairwheel)
Speedplay Ti Zeros - 164g

Total = 934g
Total Cost = 2,745 (from SRM) + $160 (Praxis) + $335 = $3,240

THM M3 w/ Spider - 384g
Praxis Rings plus bolts - 130g
THM M3 English BB - 72g
Garmin Vectors - 350g

Total Weight = 936g
Total Cost = $996 + $160 + $1700 = $2,856 (THM from R2-Bike)

Rotor PowerMeter Compact w/ Praxis Rings - 761g
Rotor BSA 30 BB - 96g
Speedplay Ti Zeros - 164g

Total = 1,021g
Price = $90 + $2,400 + $160 + $335 = $2,985

No Powermeter
THM M3 w/ Spider - 384g
Praxis Rings plus bolts - 130g
THM M3 English BB - 72g
Speedplay Ti Zeros - 164g

Total Weight = 750g
Total = $996 + $160 + $335 = $1,491

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PostPosted: Tue Jul 22, 2014 12:49 am 
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Joined: Sat May 26, 2012 11:26 pm
Posts: 482
Hollowgram stages

SISL2 compact 484g
+ stages arm (170 SI arm as SISL2 unavailable currently - 124g SISL2 arm weight) = +46g
+HSC BB w/o Sleeve - 81g
+Speedplay Ti Zeros - 164g
= 775g

$975 + $800 stages + $110 + $335 = 2220.

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PostPosted: Tue Jul 22, 2014 1:09 am 
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Joined: Sun Mar 16, 2014 3:09 pm
Posts: 99
Location: Seattle, WA | Gjøvik, Norway
SRAM Red drive side + Rival w Stages left side (w eBay purchases)..

SRAM Red 53/39 GXP exogram rings drive side only: 474g
SRAM Rival left arm w Stages: 230g ( :( )
VCRC ceramic GXP BB: 93g
Speedplay CrMo w aftermarket Ti spindles: 160g
= 957g (182g heavier than Hollowgram combination posted above)

SRAM Red GXP $230 (new eBay) + Rival w Stages $500 (almost new eBay) + $89 VCRC (new eBay) + pedals $129 + $75: $1023

Note SRAM Red cranksets are around $290 now. And Rival arms are closer to retail $700. I was lucky.

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PostPosted: Tue Jul 22, 2014 1:51 am 
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Joined: Sun Jan 16, 2011 2:45 am
Posts: 138
Location: US
I would echo what Showdown said. Started with a PT and it was a good introduction but limiting. Then went to wired SRMs. These were bulletproof, reliable, and consistent but eventually wanted to get away from wires. Had 3 Quarqs after that. Absolutely agree that they are very good products with exceptional customer service. I never had an issue with any of mine. Just recently moved to Stages as I like the flexibility of the new 9000 cranks and I like how inconspicuous it is. Also doesn't hurt that it's lighter.... I don't have a lot of experience on it yet but so far its been really good and the numbers aren't out of line with what I would expect.

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PostPosted: Sat Jul 26, 2014 5:29 am 
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Joined: Sat Jul 26, 2014 5:27 am
Posts: 4
I took the weight penalty and went with the Power 2 Max based off of DC Rainmaker's review that "it just works."

It's performed flawlessly for the last 6 months in all kinds of conditions.




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PostPosted: Sat Jul 26, 2014 11:24 am 
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Joined: Tue Mar 22, 2011 11:14 pm
Posts: 27
As the author of the original content on CPL I wanted to chip in and say that, while it's one of a range of data people find interesting, I don't think weight should feature very highly on the list of priorities when choosing a power meter. It's a tool to help do the job of improving your watts/kilo way beyond any small weight penalty so the considerations should be more in terms of accuracy, reliability, usability, maintainability. I encourage people to think about total cost of ownership. At one end of the spectrum SRM's are for life, fault-free-availability will be close to 100% of days and resale values are good. At the other end some units have low upfront cost but are questionable on other criteria.

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PostPosted: Sat Jul 26, 2014 11:37 am 
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Joined: Tue Sep 20, 2011 12:54 pm
Posts: 395
Location: Haines, AK - Temporarily
overgeared - well said, I fully agree.


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Posted: Sat Jul 26, 2014 11:37 am 


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