Sorry for what might be a long post. I also want to apologize in advance of any typos I may make while writing this post, it's a lot of numbers to work with so excuse me if I type something wrong, but I'll make an effort to get them right.
In 2010 I posted here a list of equalized complete group weights for the time. This week I finally got my hands on aftermarket Super Record EPS which meant I could complete my spreadsheet with all the current groups. Guess this is as good a time as any to share.
A couple of notes. The groups are all even, cables and housings are cut to the same length as are chains. Super Record and SR EPS are the only groups that have options and since they are top shelf I went with the lighter and more expensive option of ti spindles in the cranks and lighter brakes. But keep in mind that comes with a tradeoff in performance and price. So without further ado:
Complete group weights from lightest to heaviest:
1. Sram Red, 2125.6 grams
2. Campag Super Record, 2154.9 grams
3. Campag Record, 2263.7
4. Shimano 7900, 2277 grams
5. Campag Super Record EPS, 2285.4 grams
6. Shimano Dura Ace Di2, 2350.6 grams
7. Campag Chorus, 2352 grams
8. Sram Force, 2435.60 grams
9. Campag Record EPS, 2482 grams
10. Shimano 6700, 2529.2 grams
11. Shimano Ultegra DI2, 2619.3 grams
US Retail price for complete group from least expensive to most expensive.
1. Shimano 6700, $1292
2. Sram Force, $1325
3. Campag Chorus $1745
4/5. Ultegra Di2 and Shimano 7900 are the same, $2300
6. Campag Record, $2500
7. Sram Red, $2550
8. Campag Super Record, $3425
9. Dura Ace DI2, $3900
10. Campag Record EPS, $4600
11. Campag Super Record EPS, $5400
Now being that this is WW most of the variables will be replaced with others, so lets look at just the key pieces. (removing cranks, bb, chain, brakes and cassette.) Replacing cables with an averaged light setup such as Alligator. (100 grams for brake and 60 grams for shift.)
From lightest to heaviest
1. Sram Red 660.4 grams
2. Super Record, 729.1 grams
3. Record, 749.5 grams
4. 7900, 753.8 grams
5. Campag Chorus, 760.3 grams
6. Sram Force, 771.5 grams
7. Dura Ace Di2 822.6 grams
8. 6700, 875.5 grams
9. Super Record EPS, 891.8 grams
10. Record EPS, 899 grams
11. Ultegra Di2, 960.8
What surprises me is how little actual difference in weight between SR EPS and Record EPS, about 7 grams. This list also better shows the difference in weight between mechanical and electronic.
Another big surprise to me is that on the trimmed list Dura Ace Di2 comes in lighter than Super Record. Campag gives up ground with the battery, wire and bits that go along with making it all work. If you add up the essential electronic pieces (battery, mount, wires etc..) you get 230.7 for Campag electronics and 165.1 for Dura ace Di2 and even a little less for Ultegra. Also I think it's important to note that Dura Ace is a few years old and with the next one we can expect some weight savings. I'd also think that for next year we'll see SR EPS shave some weight, it's just too close to record EPS to justify itself, in my opinion.
One thing that I think is starting to come more clear to me is the need for Sram to get lighter bottom bracket and cableset. Notice how light Red is compared to SR on the trimmed list, but how little actual difference when you look at the complete group. Sram looses a lot of ground with the bb and cables. The other thing is the need for them to get moving with an electronic group. With Shimano announcing a new one soon for 2013 and Campag moving all the way down to Athena EPS it's clear that this platform is not going to go away.
I was going to list all the individual pieces and their weights, but it looks like I've run out of time today and it's a long list of numbers. I'll try to get it added to this post tomorrow.
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Last edited by madcow on Thu Apr 12, 2012 3:56 pm, edited 6 times in total.