HOT: Active* forum members generally gain 5% discount at starbike.com store!
Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Articles FAQ Contact About




Post new topic Reply to topic  [ 181 posts ] 
Go to page Previous  1 ... 9, 10, 11, 12, 13  Next
Author Message
PostPosted: Sat Jan 18, 2014 1:14 pm 
Offline

Joined: Fri Dec 24, 2010 9:37 pm
Posts: 569
Location: it's raining, it must be uk
according to their respective datasheets, they both have the same rated capacity, battery technology and casing, so it's down to manufacturing quality and batch variation

assuming both are competently manufactured, i doubt there will be any significant difference in operating lifetime

however, this is weightweenies, the ep has a claimed weight of 6.8g, while the eve is 8g, that's over 17% heavier!

the correct choice has to be the ep version

advisory: this posting may contain less than 100% of serious


Top
 Profile  
 
PostPosted: Sun Apr 27, 2014 12:29 pm 
Offline

Joined: Sun Apr 27, 2014 12:22 pm
Posts: 2
Hi guys,

Thanks for the valuable post, I already replaced my SRM DA 7900 battery with two 3.5v 750mah. I also remove the chain rings and that was not required but that's what was done. Offset changed from 587 to 505.

After putting everything back, the battery and chainrings offset still the same between 493 in the begining and yesterday indoors at 505. Now do I need to worry about the offset change. Please note that slope is still the same.

Please note that I tested the offset at 3, 6, 9, 12 angles and all reported within 1 to 3 units difference. I use Garmin edge 510.

Thank you.


Top
 Profile  
 
Posted: Sun Apr 27, 2014 12:29 pm 


Top
  
 
PostPosted: Sun Apr 27, 2014 5:39 pm 
Offline

Joined: Sat Dec 13, 2003 2:25 am
Posts: 4479
Location: Canada
Should be fine. I am a bit suprised to see that the Slope is the same. Typically, when you open-up the PowerMeter, the Slope will change, even a little. Did you test it?


Top
 Profile  
 
PostPosted: Mon Apr 28, 2014 7:33 am 
Offline

Joined: Sun Apr 27, 2014 12:22 pm
Posts: 2
I didn't recalibrate the powermeter with weights but found after pairing it with new batteries that the slope is the same as what it was stored before battery change 26.1.

Also I think that there is no need for recalibarion as the chainrings are the same.

Thank you


Top
 Profile  
 
PostPosted: Mon Apr 28, 2014 4:00 pm 
Offline

Joined: Sat Dec 13, 2003 2:25 am
Posts: 4479
Location: Canada
Unfortunately, that will not work.

The SRM is pretty durable and resistant to changes to Slope based upon normal usage (even the changing of rings, assuming that they are reinstalled using the same torque settings), but as soon as you open the case and change the batteries, all bets are off.

The reporting of the Slope by the PowerMeter utilising the 'automatic' system is not indicative of the true Slope of the SRM, rather it is only indicative of the Slope of the SRM when it was tested at the time of original manufacture (or at the time of the last service at SRM). Unfortunately, it is not possible for you to change the 'Automatic' Slope reported by the PowerMeter (which is why I always recommend that people set their PowerController to select Slope using the 'Manual' option).

As an aside, the average SRM PowerMeter battery (assuming no system issue causing an unusual battery drain) lasts so long now that I think it would be impossible to get through an entire battery without having to recheck the Slope. Personally, I would recommend confirming the Slope by recalibrating the PowerMeter at least at the beginning of every training season.

The calibration of the SRM is pretty simple and there are a lot of different instructions on-line that will show you how. The key is to make sure that you have a known weight to start with, so accuracy counts here. There are lab weights available, but they are expensive. Rather, I recommend using Ivanko Calibrated plates, which are certified to within 10g. I use two yellow 15kg plates on an old spindle. If you need more, please feel free to PM me.


Top
 Profile  
 
PostPosted: Tue Apr 29, 2014 7:23 am 
Offline

Joined: Thu Dec 20, 2007 8:55 pm
Posts: 153
Geoff wrote:
Unfortunately, it is not possible for you to change the 'Automatic' Slope reported by the PowerMeter...


That is true unless you happen to have SRM's little proggie that can change the slope stored in the crank... :D


Top
 Profile  
 
PostPosted: Tue Apr 29, 2014 1:39 pm 
Offline

Joined: Sat Dec 13, 2003 2:25 am
Posts: 4479
Location: Canada
@dual, what are you saying? Do you have some information on a work-around? That would be interesting...


Top
 Profile  
 
PostPosted: Tue Apr 29, 2014 10:00 pm 
Offline

Joined: Sat Apr 03, 2010 11:05 pm
Posts: 326
dual wrote:
Geoff wrote:
Unfortunately, it is not possible for you to change the 'Automatic' Slope reported by the PowerMeter...


That is true unless you happen to have SRM's little proggie that can change the slope stored in the crank... :D


Do tell!


Top
 Profile  
 
PostPosted: Fri May 02, 2014 7:35 am 
Offline

Joined: Thu Dec 20, 2007 8:55 pm
Posts: 153
@Geoff, Chiva: PM.


Top
 Profile  
 
PostPosted: Sat May 03, 2014 8:57 pm 
Offline
User avatar

Joined: Thu Sep 21, 2006 8:57 pm
Posts: 3726
Location: Vicenza
Would you kindly send me a PM as well?
Interested...

_________________
ciclismo-espresso.com


Top
 Profile  
 
PostPosted: Mon May 05, 2014 7:55 am 
Offline

Joined: Thu Dec 20, 2007 8:55 pm
Posts: 153
Don-e. :)


Top
 Profile  
 
PostPosted: Mon May 05, 2014 10:09 am 
Offline

Joined: Wed Jan 28, 2009 11:33 pm
Posts: 64
dual wrote:
Geoff wrote:
Unfortunately, it is not possible for you to change the 'Automatic' Slope reported by the PowerMeter...


That is true unless you happen to have SRM's little proggie that can change the slope stored in the crank... :D


Or just use a Garmin. It allows you to send a new slope value down to the SRM, but you already knew that :lol:


Top
 Profile  
 
PostPosted: Mon May 05, 2014 1:37 pm 
Offline

Joined: Sat Dec 13, 2003 2:25 am
Posts: 4479
Location: Canada
PC7 user, though. The simple 'solution' is just using the 'Manual' Slope setting on your PowerController.


Top
 Profile  
 
PostPosted: Mon May 05, 2014 6:12 pm 
Offline

Joined: Thu Dec 20, 2007 8:55 pm
Posts: 153
FredBloggs wrote:
...but you already knew that :lol:


You bet! :D


Top
 Profile  
 
PostPosted: Thu May 08, 2014 1:06 pm 
Offline
User avatar

Joined: Fri Jul 23, 2004 8:24 pm
Posts: 1544
Location: Houston, Texas
dual wrote:
That is true unless you happen to have SRM's little proggie that can change the slope stored in the crank... :D
PM sent!

_________________
Michael - The Anaerobic Threshold is neither...


Top
 Profile  
 
Posted: Thu May 08, 2014 1:06 pm 


Top
  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 181 posts ] 
Go to page Previous  1 ... 9, 10, 11, 12, 13  Next


Who is online

Users browsing this forum: duckson, glepore, Google [Bot], Google Adsense [Bot], latman, too crusty and 52 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. At home Di2 install....

[ Go to page: 1, 2, 3 ]

in Road

chiltonp

35

2493

Thu Aug 21, 2014 6:24 pm

rma View the latest post

There are no new unread posts for this topic. Fizik R1/Sidas insole home moulding

in Road

DJT21

2

595

Thu Dec 05, 2013 6:47 pm

mitchgixer6 View the latest post

There are no new unread posts for this topic. Athena EPS - Battery V2 compatible with V1

[ Go to page: 1, 2 ]

in Road

Nejmann

17

1286

Wed Nov 13, 2013 5:10 pm

ferrarista View the latest post

There are no new unread posts for this topic. 7970 Di2: 2 vs. 4 wire battery?

in Road

TomHelly

0

443

Mon Nov 04, 2013 3:56 pm

TomHelly View the latest post

There are no new unread posts for this topic. Ui2 battery seatpost advice

in Road

KOGAN

11

1268

Wed Nov 20, 2013 5:33 am

drmutley View the latest post


It is currently Mon Oct 20, 2014 12:48 pm

All times are UTC + 1 hour




Advertising   –  FAQ   –  Contact   –  Convert   –  About

© Weight Weenies 2000-2013
hosted by starbike.com


How to get rid of these ads? Just register!


Powered by phpBB