"PRO" Cycling Discussion

Questions about bike hire abroad and everything light bike related. No off-topic chat please

Moderators: robbosmans, Moderator Team

User avatar
djconnel
Posts: 7917
Joined: Wed Sep 26, 2007 1:57 pm
Location: San Francisco, CA
Contact:

by djconnel

You prove my point: 2% variation in L-R balance. That's a 4% error off the top on total power. That's consistent with what I saw with DCRainmaker's data. If 4% power errors don't matter to Sky, then fine.

Suppose I'm looking at power to pace myself in a double century. 4% is good enough. I'm just using it to make sure enthusiasm doesn't get the best of me on early climbs.

by Weenie


Visit starbike.com Online Retailer for HighEnd cycling components
Great Prices ✓    Broad Selection ✓    Worldwide Delivery ✓

www.starbike.com



User avatar
Tapeworm
Posts: 2585
Joined: Thu May 03, 2007 10:39 am

by Tapeworm

djconnel wrote:Expect riders to emerge from season with rippling muscles on left legs and atavistic, atrophied right legs due to biofeedback.


:lol: But as you said, a potential 4% (or potentially) more error of margin seems a step away from the team of "marginal gains".

I do think the Stages is an excellent unit though for a whole host of reasons mentioned above by KW, plus it's not that expensive. And LIGHT.
"Physiology is all just propaganda and lies... all waiting to be disproven by the next study."
"I'm not a real doctor; But I am a real worm; I am an actual worm." - TMBG

User avatar
bearsdidit
Shop Owner
Posts: 320
Joined: Tue Feb 08, 2011 7:56 am
Location: California
Contact:

by bearsdidit

It looks like the Sky guys are interested in using Strava for the KOMs!

DanW
Posts: 1243
Joined: Fri May 02, 2008 5:39 pm
Location: Here, there and everywhere

by DanW

You prove my point: 2% variation in L-R balance. That's a 4% error off the top on total power. That's consistent with what I saw with DCRainmaker's data. If 4% power errors don't matter to Sky, then fine.


No offence to KW but I don't think he is at the level of riding pro for SKY (correct me if I am wrong :D ). Based on my own highly unscientific observations, this 4% total error due to L/R imbalance with the Stages assumption is what I'd expect for an enthusiastic amateur, having an off day and maybe carrying a niggling injury to one leg. I would have thought this represents a very worst case error and certainly not something you'd see in a fit and healthy Pro. Total errors due to the one side assumption are therefore pretty low. For all we know the measurement error with Stages is half that of SRM or similar and both output the same power at the end of the day with the same overall uncertainty in the final number???

I do agree there is more potential for magnifying errors with Stages but it's unlikely to bother the Pros and if SKY adopt it then you'd have to assume they've given it some thought. You'd also think that if Stages are confident in their assumption they could publish some data which would be good to look at (rather than some vaguely similar looking power outputs on their website)

DartanianX
Posts: 616
Joined: Sun Nov 13, 2011 6:00 am

by DartanianX

Finally a nice looking National Champions jersey.

Image

Still not kit for the Tinkoff Saxo Team. Plain Sportful kit for now.

Image

Sent from my Nexus 4 using Tapatalk

User avatar
djconnel
Posts: 7917
Joined: Wed Sep 26, 2007 1:57 pm
Location: San Francisco, CA
Contact:

by djconnel

Andy looks super-skinny for January. He was complaining last year as he's matured he's not been able to maintain as low an off-season weight. He looks almost anorexic in that photo.

User avatar
djconnel
Posts: 7917
Joined: Wed Sep 26, 2007 1:57 pm
Location: San Francisco, CA
Contact:

by djconnel

DanW wrote:
You prove my point: 2% variation in L-R balance. That's a 4% error off the top on total power. That's consistent with what I saw with DCRainmaker's data. If 4% power errors don't matter to Sky, then fine.


No offence to KW but I don't think he is at the level of riding pro for SKY (correct me if I am wrong :D ). Based on my own highly unscientific observations, this 4% total error due to L/R imbalance with the Stages assumption is what I'd expect for an enthusiastic amateur, having an off day and maybe carrying a niggling injury to one leg. I would have thought this represents a very worst case error and certainly not something you'd see in a fit and healthy Pro.


Maybe you're right -- maybe they compared it to SRM and it was fine. All I have is a few rides from DC Rainmaker, who's not a pro.

KWalker
Posts: 5722
Joined: Mon Dec 28, 2009 8:30 pm
Location: Bay Area

by KWalker

djconnel wrote:You prove my point: 2% variation in L-R balance. That's a 4% error off the top on total power. That's consistent with what I saw with DCRainmaker's data. If 4% power errors don't matter to Sky, then fine.

Suppose I'm looking at power to pace myself in a double century. 4% is good enough. I'm just using it to make sure enthusiasm doesn't get the best of me on early climbs.


If it's always 4%, then is still consistent right? Given that they were using O Sys with SRMs for years juuuust fine, which would have more error, shouldn't be a big deal.

I also wouldn't presume any error would be lower/higher than in a pro. It doesn't necessarily affect my gross efficiency. My power output is the same at 50/50 for lots of work as it is at 52/48 from the data I have. But again, it measures power from both legs, not just 1.
Don't take me too seriously. The only person that doesn't hate Froome.
Gramz
Failed Custom Bike

User avatar
prendrefeu
Posts: 8580
Joined: Wed Oct 31, 2007 10:32 pm
Location: Glendale / Los Angeles, California
Contact:

by prendrefeu

That Trek Factory Racing kit is, sadly, not surprising given the primary sponsor. I'm sure the fabric is stocked with tech, but the aesthetics are severely lacking.
Par for course but, moving on... best of luck to the Schlecks, et al., in getting their Grand Tour mojo back on.
Exp001 || Other projects in the works.

hotshot
Posts: 138
Joined: Sat Jun 24, 2006 12:52 am
Location: Werribee, Australia

by hotshot

DartanianX wrote:Michael Hepburn wins Australian Elite TT title

Orica Green Edge go 1-2-3 as well with Luke Durbridge and Damien Howson rounding out the podium for OGE.

Image
Image
Image
Image

Looks like OGE have the same design skin suit wise as Sky last year.

Sent from my Nexus 4 using Tapatalk


They are similar to the Bioracer ones used by Sky and Tony Martin, but not exactly the same. same material but different paneling and cut to the 2 suits. From memory craft had suits very similar for sale last year.

xnavalav8r
Posts: 2594
Joined: Mon Jan 21, 2008 12:09 pm

by xnavalav8r

djconnel wrote:Andy looks super-skinny for January. He was complaining last year as he's matured he's not been able to maintain as low an off-season weight. He looks almost anorexic in that photo.


Andy who?

xnavalav8r
Posts: 2594
Joined: Mon Jan 21, 2008 12:09 pm

by xnavalav8r

prendrefeu wrote:That Trek Factory Racing kit is, sadly, not surprising given the primary sponsor. I'm sure the fabric is stocked with tech, but the aesthetics are severely lacking.
Par for course but, moving on... best of luck to the Schlecks, et al., in getting their Grand Tour mojo back on.



You have to admit, the Trek kit looks better than the Sky mesh bodystocking.

User avatar
Kjetil
Posts: 2853
Joined: Sat Jul 30, 2011 1:17 pm
Location: Hamar, Norway
Contact:

by Kjetil

DartanianX wrote:Finally a nice looking National Champions jersey.
:) Gone the Leopard atrocities. Time for Fabü to become Swiss national champion again.

Also, and sliding off topic: Where can I find (popular) science on the unimportance of left/right power balance? A fellow rider just shelled out on Garmin Vector pedals and is worried about 60/40. Would be nice lead him to facts.
Bianchi-Campagnolo
The Specialissima
Gylne Gutuer, the UCI 1.2 bike race I invented.

pastronef
Posts: 1640
Joined: Fri Mar 11, 2011 11:33 am
Location: Asti, ITALIA

by pastronef


by Weenie


Visit starbike.com Online Retailer for HighEnd cycling components
Great Prices ✓    Broad Selection ✓    Worldwide Delivery ✓

www.starbike.com



User avatar
euan
Posts: 1571
Joined: Sat Sep 05, 2009 11:20 am

by euan

xnavalav8r wrote:You have to admit, the Trek kit looks better than the Sky mesh bodystocking.


regular jersey vs special skinsuit, yeh

anyways the Trek kit is just designed to fit with the branding of the MTB Trek racing teams

Locked