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Old 01-28-09, 09:06 AM   #1
afb
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should I go with a SRAM red 11-28

I am thinking of getting a SRAM OG-1090 Red 10-Speed Cassette 11-28. I currently ride on a Shimano Dura ace 12-27. The above is lighter and I get two more gear options. My plans are to ride in the mountains, plus Durango to Silverton (have not done this yet) plus a race in Davis mountains, Texas (first race). I have ridden in mountains of 8000 ft elevations and many hills but with the other combination I think it may help.
My questions are:
Will this give me the advantage quicker and ease up mountains?
Do I need to get a chain the works with the new cassette vs CN7800? I am in the process of buying a new chain (plus replacing the crank set FSA K-force light compact ceramic) so I was thinking should I upgrade the cassette while I am doing so.
I just recently got some HED jet 50s and can tell a big difference and really like these tweaks that add to the performance efficiency.
Thanks for any information
Annette
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Old 01-28-09, 09:09 AM   #2
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My wife changed from a 12-27 to an 11-28 SRAM and likes it. She uses a Shimano DA chain and no problems. She says the 28 is noticeably easier than the 27. From a gear chart it isn't a huge difference, but any bit helps on some climbs.
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Old 01-28-09, 09:14 AM   #3
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I've done the Durango to Silverton- brutal but fun. I used a 12-27 cassette with a 39-52 crankset and would have definitely used a lower gear if I had it.
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Old 01-28-09, 09:31 AM   #4
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I'm very happy with my SRAM 11-28 mated to a compact 50/34. The 11 is nice to have on my long, straight downhill on my morning commute.
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Old 01-28-09, 09:48 AM   #5
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The only downside to the 11-28 is the large jump between the 19 & 22 of 14%. More common jumps are in the 8-11% range.

If you're using a compact crank, the 11T makes sense, but with a 53/39 not so much. While I use a 50/11 a lot while descending, if the slope is so great that you can really use a 53/11, you're better off spinning up to 45 mph or so and then crouch down an let gravity take over. If someone ahead of you wants to waste energy by spinning a 53/11, get behind them and draft. At that speed you don't have to get very close.
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Old 01-28-09, 10:27 AM   #6
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I forgot to mention I am using a compact. thanks for your insights
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Old 01-28-09, 10:36 AM   #7
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Quote:
Originally Posted by DaveSSS View Post
The only downside to the 11-28 is the large jump between the 19 & 22 of 14%. More common jumps are in the 8-11% range.
EDIT Looking up the specs, all levels of SRAM show a 22 and not a 21, but I swear mine said 21 in the ad. Now I need to go home and count them. If it is a 22, the jump isn't very noticeable.

Funny you should say that. That's not the case with SRAM Force, which is why I chose a SRAM cassette.
The SRAM 11-28 is 11-12-13-14-15-17-19-21-24-28
The Ultegra 11-25 is 11-12-13-14-15-17-19-21-23-25
Therefore, the cassettes act the same except for the last two cogs. Yes, the 24-28 is a big jump, but that's my climbing granny gear so it's not an issue. 21-24 isn't too bad either because with a compact, that's getting into the major climbing gears as well.
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Old 01-29-09, 06:29 AM   #8
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I've used a SRAM 11-28 10-speed cassette which has 19-22-25-28 for the biggest four cogs. I didn't like the 19-22 or 22-25 jumps, they are just too big. I've therefore now made a custom cassette of 12-28 by taking a standard 12-25 10-speed cassette, removing the 16 tooth cog, and added a 28 tooth to the top end which is a leftover from an old Shimano LX 11-32 9-speed cassette (it is hard to find individual cogs in these sizes, most are mounted within a set of the 3 largest cogs).

Basically, I've sacrificed the 11 tooth cog on the 11-28 for one more gear in the lower range, to make the biggest five cogs 19-21-23-25-28 - all nice small changes. The 16-tooth cog that I removed from the 12-25 cassette is not missed because the 11-28 doesn't have one of those anyway.

I had to try a few different spacers to get the spacing right between the individual 28 tooth cog and the 25, but I finally found an old spacer in a draw that made it just about perfect. I also had to adjust the limit screws on the rear derailleur because the cassette sits slightly further out than normal. Therefore, this option isn't for the inexperienced to try. Hopefully, someone will start to produce 12-28 cassettes with this spacing and everyone can reap the benefits more easily.

A message to SRAM or Shimano: Here is the perfect combination that you need to offer:
12-13-14-15-17-19-21-23-25-28.
This results in percentages differences of:
8%, 8%, 7%, 13%, 12%, 11%, 10%, 9%, 12%.

In contrast, the current SRAM 11-28 cassette offers:
11-12-13-14-15-17-19-22-25-28
This results in percentages differences of:
9%, 8%, 8%, 7%, 13%, 12%, 16%, 14%, 12%.

Shifts that are larger than ideal in my opinion (12.5% and larger) are bolded. As you can see, my combination has fewer of these. This is at the expense of your top gear, but which do you spend more time in: you top gear, or your second and third gears? I think most people would agree that it is the latter, and having one more gear in there to allow you to keep a more consistent cadence is much nicer.

EDIT: In comparison, the current Shimano 12-27 is also not as good based on my criteria:
12-13-14-15-16-17-19-21-24-27
This results in percentages differences of:
8%, 8%, 7%, 7%, 6%, 12%, 11%, 14%, 13%.

Last edited by Chris_W; 01-29-09 at 06:36 AM.
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