Shimano 12speed...

Discuss light weight issues concerning road bikes & parts.
TheRich
Posts: 386
Joined: Tue Jan 01, 2019 1:36 am

by TheRich

wheelbuilder wrote:
Thu Feb 14, 2019 5:41 am
TheRich wrote:
Wed Feb 13, 2019 4:47 pm
I'm actually kind of curious what higher mileage eTap users do to keep their batteries charged. I charge my Di2 every month because that's the only interval I can remember and if I forget here and there it doesn't matter. From what I've read, that's the minimum for eTap, and forgetting can have major consequences.
Whoever you are hearing that from is WAY off. I'm not high mileage but do get 120-140 miles a week. I charge my etap batteries about every 3-4 months. Leaving them attached to derailleurs while bike is on a car rack drains them much faster as the system is constantly going to sleep/waking up. This has a big effect on battery life. I also have battery life indicator field for rear battery activated on my Garmin, so this gives an accurate representation of battery life instead of guessing or waiting for derailleur status lights. Once a month? No way.
IIRC, that was the guidance from SRAM, or maybe it was a suggestion from a review. Removing batteries is a downside, time consuming and a potential point of failure, btw.

My last ride according to di2stats:

Start Date 2019-02-12 11:25:54 PST
Finish Date
# Total shifts 1132
# Front shifts 54
# Rear shifts 1078
Time b/t shifts 12.9 seconds
Moving time 4:03:12
Distance 71.58 mi
Ascent 6148 ft
Descent 6033 ft

I just got my BT transmitter 10 days ago, but my longest time b/t shifts was 34 seconds on a very easy ride, the average is about 25sec. The pasted ride had a lot of shortish climbs, so a lot of shifting. How would eTap deal with 9hr/week of that? Could it make over 5000 shifts over the space of a month between charges?

I shift a whole lot more than I thought, thanks Di2.

TobinHatesYou
Posts: 4032
Joined: Mon Jul 24, 2017 12:02 pm

by TobinHatesYou

Why would you even put a duration on your question? Can an eTap battery make 5000 shifts? Yes, easily. It can probably make 8000-10000 rear shifts.

Also 34s maximum between shifts? What?

by Weenie


TheRich
Posts: 386
Joined: Tue Jan 01, 2019 1:36 am

by TheRich

TobinHatesYou wrote:
Thu Feb 14, 2019 7:56 pm
Why would you even put a duration on your question? Can an eTap battery make 5000 shifts? Yes, easily. It can probably make 8000-10000 rear shifts.

Also 34s maximum between shifts? What?
If you're swapping batteries every two weeks, what makes you so confident? I know Di2 can, it just did because I forgot to charge my battery recently.

34 seconds average time between shifts on an easy ride, is it not obvious what that means? We have hills here, they tend to slow you down. If you're not shifting much, why go electronic in the first place, asthetics? The big advantage is in FD shifting after all.

TobinHatesYou
Posts: 4032
Joined: Mon Jul 24, 2017 12:02 pm

by TobinHatesYou

TheRich wrote:
Thu Feb 14, 2019 8:12 pm
TobinHatesYou wrote:
Thu Feb 14, 2019 7:56 pm
Why would you even put a duration on your question? Can an eTap battery make 5000 shifts? Yes, easily. It can probably make 8000-10000 rear shifts.

Also 34s maximum between shifts? What?
If you're swapping batteries every two weeks, what makes you so confident? I know Di2 can, it just did because I forgot to charge my battery recently.

34 seconds average time between shifts on an easy ride, is it not obvious what that means? We have hills here, they tend to slow you down. If you're not shifting much, why go electronic in the first place, asthetics? The big advantage is in FD shifting after all.

You didn’t say longest average, you said longest. Also I do similar rides...all my rides are around 100ft gained per mile or worse... on a 74mi ride with 8000ft climbed, I shifted the rear 700 times and the front 64 times.

I charge my batteries on a schedule of 2 weeks because that’s convenient to remember and charging batteries when they are 25-75% discharged induces the least stress on the battery. It has nothing to do with confidence...I know they can last me >3 weeks.

I’m already probably on the more extreme side when it comes to shift frequency. You’re just off the chart.

User avatar
wheelbuilder
Posts: 691
Joined: Wed Feb 08, 2017 2:10 am

by wheelbuilder

Wow man, that data you posted.......Does that read average time between shifts of 12.9 seconds?
Never cheer before you know who is winning

TheRich
Posts: 386
Joined: Tue Jan 01, 2019 1:36 am

by TheRich

wheelbuilder wrote:
Fri Feb 15, 2019 5:30 am
Wow man, that data you posted.......Does that read average time between shifts of 12.9 seconds?
Lots of climbing with hills just big enough to go all the way down to 34/28 (didn't use the 32t cog somehow) and then back up to 50/11 on the way down the backsides. 50/11 was my most used gear.

It's an interesting site if only to see your shifting and cadence habits, I had no idea I shifted so often because that a lot of shifting.

jlok
Posts: 1044
Joined: Tue Jun 30, 2015 3:30 am

by jlok

thx for the di2stats.com info. interesting data.

Title Untitled 2018-12-26-09-38-27.fit
Start Date 2018-12-26 09:38:27 HKST
Finish Date
# Total shifts 896
# Front shifts 8
# Rear shifts 888
Time b/t shifts 11.4 seconds
Moving time 2:49:54
Distance 84.22 km
Ascent 1100 m
Descent 1108 m
Climbing ratio 7.66
Climbing rate 388 m/hr
Avg/max speed 28.9 / 64.57 kph
Avg/norm/max power 164 / 192 / 1005 watts
Avg/max HR 148 / 182 bpm
Avg/max cadence 80 / 127 rpm
Notes n/a
Litespeed T1sl Disc / BMC TM02 < Giant Propel Advanced SL Disc 1 < Propel Adv < TCR Adv SL Disc < KTM Revelator Sky < CAAD 12 Disc < Domane S Disc < Alize < CAAD 10

Karvalo
Posts: 705
Joined: Fri Aug 10, 2018 6:40 pm

by Karvalo

wheelbuilder wrote:
Fri Feb 15, 2019 5:30 am
Wow man, that data you posted.......Does that read average time between shifts of 12.9 seconds?
Not sure how much to read into that really. I think mean average is a bad metric to use to build a picture of shift habits, particularly when you consider multishift.

Think how many times on a ride you might hit a steep ramp or go over a crest and make 4 or 5 rear shifts and a front shift in the space of a few seconds. You could then ride on for over a minute without touching a lever and your average shift time is still 12 seconds or so.

If you're purely tracking mech/battery useage then it's good, if you're thinking about how much you use the gears then a program that could count multi-shifts or rapid bursts of shifts as one instance of shifting you'd get a clearer picture of how 'busy' you are.

jlok
Posts: 1044
Joined: Tue Jun 30, 2015 3:30 am

by jlok

There's a shifting time line to graphically show how busy you are shifting.
Litespeed T1sl Disc / BMC TM02 < Giant Propel Advanced SL Disc 1 < Propel Adv < TCR Adv SL Disc < KTM Revelator Sky < CAAD 12 Disc < Domane S Disc < Alize < CAAD 10

User avatar
WinterRider
Posts: 564
Joined: Tue Feb 05, 2013 2:46 pm

by WinterRider

"Wrong place guys! This is weight weenies! A forum based entirely on new gear, tech and light weight. If O.P can’t ask the question on this forum then where can he? Image"

LMAO...... :lol: :lol: :lol:

So.. one buys the contraption hereas the flippin' chain jumps the ring.. one hauls a battery around every mile all the while wondering if the thang is chg'd.. the group set is heavier than a quality mech system.

No.. this ain't weight weenies.. it's

WALLET WEENIES
Litespeed 2000 Appalachian 61 cm
Litespeed 1998 Blue Ridge 61cm

Fitness rider.. 2 yrs from seven decades age.

That is my story and I'm stick'n to it.

Post Reply
  • Similar Topics
    Replies
    Views
    Last post