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Forever a Student
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SRAM Red eTap - actual weights and installation - BikeRadar



The eTap group as a whole is about 1,970g, roughly 60g heavier than mechanical Red but about 75g lighter than Shimano Dura-Ace Di2 9070 for comparably configured setups.

Claimed weight for a pair of eTap shifters is 130g and we weighed our test samples at 131g. For reference, mechanical Red shifters are 140g a piece.


The rear derailleur is claimed at 239g; we weighed ours at 237g including the 24g battery (the red plastic cover weighs 3g).


The front derailleur is claimed at 187g; we weighed ours at 162g including the battery.
 

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Have to admit, it looks pretty cool.

How does one know the battery level in each component (derailleurs and shifters)? Is an owner going to need to carry spare 2032 batteries?
 

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Forever a Student
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Have to admit, it looks pretty cool.

How does one know the battery level in each component (derailleurs and shifters)? Is an owner going to need to carry spare 2032 batteries?

From what I gather every time you press a shift button it will light up a color. Every time a derailleur does something it will light up a color.


Green means good battery life. Red means less than 25%. Flashing red means less than 5%

The interchangeable derailleur batteries do need charging. SRAM claims a 60-hour battery life, which could last between 1 and 6 months. The LED light shows green until battery life dips under 25%, at which point is shows red. The LED starts to flash red when battery life is below 5%.


After releasing a safety switch, the batteries slide out easily and into a charger.


The shifters use standard CR2032 coin batteries, with the same LED indicator system. SRAM claims these will last about two years.


When traveling, SRAM recommends removing the batteries and attaching plastic covers to the derailleurs and batteries. The system works on accelerometers; the system is put to sleep when immobile then woken when moved. So, if you transport your bike by car or plane without removing the batteries, then the system will be awake the whole time.
It would be the large proprietary batteries that you'd want to be carrying if anything. The shifter batteries should last two years, that's a long time. You will see the red lights on the shifters long before they die. The derailleur batteries though will die much quicker and need much more constant attention.
 

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But the odds are the front and rear derellier batteries won't die at the same time. So you can swap them around. Say, rear dies you take the front and swap it with the rear.
 

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Got a weight comparison of the system to Di2 Ultegra or Dura Ace with an internal battery ?
 

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I'm kinda surprised a shifter is only 10gm less than the mech Red; no cable drum, metal ratchet wheel, pawls and linkages, spring, shaft.... I guess it's a testament to how light the mech Red is.
 

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Adorable Furry Hombre
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Maybe by the time Capag introduced semi-wireless into their toys, my cabled Campy will need replacing.

I'll leave it to the early adopters to suffer all the "features", and then snag some with my preferred ergonomics.
 

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Got a weight comparison of the system to Di2 Ultegra or Dura Ace with an internal battery ?
Actual weights of 2015 retail items with standard crank and 11-25 (ish) cassette:

Sram Red 22: 1741 grams (BB30) or 1845 grams (GXP)

Campy Super Record: 1940 grams

Sram Red 22 eTap: 1970 grams

Dura-Ace 9000: 1998 grams

Dura-Ace 9070 Di2: 2034 grams (internal battery)

Campy Record: 2039 grams

Campy SR EPS v3: 2078 grams

Sram Force 22: 2097 grams (BB30) or 2177 grams (GXP)

Ultegra 6800: 2294 grams

Ultegra 6870 Di2: 2407 grams (internal battery)

105 5800: 2445 grams
 

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Matnlely Dregaend
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My 10 year old Record group weighs the same... but I'll admit I'm intrigued by the concept. There is no chance I'll buy this group until about 2 or 3 years from now based on SRAMs consumer based beta testing program, but if they manage to make this work perhaps they can introduce wireless brakes and get rid of cables altogether? Maintenance wise this would be great.
 

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, but if they manage to make this work perhaps they can introduce wireless brakes and get rid of cables altogether? Maintenance wise this would be great.
Really? what type of brake cable maintenance do you do?

The need for modulation, varied pressure ect makes wireless braking a completely different ball game from shifting so managing to get shifting to work wouldn't say much about being able to do it for brakes.
 

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then how would you shift the front without battery?
Seriously? If you're dumb enough to let your battery(s) die you deserve to ride home on only the rear derailleur.

I'm kinda surprised a shifter is only 10gm less than the mech Red; no cable drum, metal ratchet wheel, pawls and linkages, spring, shaft.... I guess it's a testament to how light the mech Red is.
Read it again:

"Claimed weight for a pair of eTap shifters is 130g and we weighed our test samples at 131g. For reference, mechanical Red shifters are 140g a piece.
 

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Matnlely Dregaend
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Really? what type of brake cable maintenance do you do?

The need for modulation, varied pressure ect makes wireless braking a completely different ball game from shifting so managing to get shifting to work wouldn't say much about being able to do it for brakes.
Well, really, I do lots of maintenance regarding brakes. The first place a steel frame rusts seems to be at the cable stops, for me it's the ones on the top tube. I spend quite a lot of time cleaning there and restoring the frame if it rusts. The cable itself can corrode from sweat (even the stainless ones do on me, Campy quality and everything...), and obviously they need to be replaced every 2 years or so at a minimum. The brake cable needs frame protectors at the head tube and often on the top tube near the seat post. The housing needs to be replaced when it starts to crack (or before that happens). The brake adjusters on the calipers tend to corrode / gum up, as do the anchor plates. All this could be avoided without cables.

I think the modulation should be doable remotely, but obviously there would have to be safety features, like automatic engagement if the link fails.
 
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