Found "perfect" gearing, but how do I get it

Looking to get a Powermeter so I have been analyzing my gearing. I currently rid 53/39 with 11-23 in the flats of Florida.

After comparing all of my options (compact vs. standard etc…), and considering the value of an 18t cog, Ive decided the perfect setup for me is 53/39 with 12-21t cassette.

After finding this, the search for the 12-21 is endless. I believe the only option was the Shimano DA CS-7800, but I cant even find that.

Any help or suggestions? Im a ~22mph HIM rider and do frequent group rides in the 20mph range. My “hills” are bridges!

Looking to get a Powermeter so I have been analyzing my gearing. I currently rid 53/39 with 11-23 in the flats of Florida.

After comparing all of my options (compact vs. standard etc…), and considering the value of an 18t cog, Ive decided the perfect setup for me is 53/39 with 12-21t cassette.

After finding this, the search for the 12-21 is endless. I believe the only option was the Shimano DA CS-7800, but I cant even find that.

Any help or suggestions? Im a ~22mph HIM rider and do frequent group rides in the 20mph range. My “hills” are bridges!
Not commenting on your quest for an 18t cog, but if your riding is flat, you could have a much bigger than inner chainring than a 39. Certainly a 42 and perhaps even a 44 or 45. Though if you’re in the big ring all the time, maybe that’s not relevant.

http://www.wiggle.co.uk/shimano-dura-ace-7900-10-speed-cassette/

Wiggle seems to have the 12-23 Dura Ace in stock and I think (through a quick search) that it has the 18 tooth cog. The 11-21 should also (I believe).

I suggest that you are being too particular about your gearing =)
.

12-23 (12,13,14,15,16,17,18,19,21,23).

Take it you don’t get to the Clermont area much!

I think you’re better off having a little more adapability in your RPM range… what’s is that… 4RPM? Maybe I’m just too used to constantly changing terrain. Between slight inclines, declines and wind, there is NEVER perfect gearing in the midwest. I know that with my “A” race next year being a hilly course, I’m specifically working on adapting to using a lower cadence most of the time, expecially climbing. But then again having raced MTB quite a bit in college, running a wider RPM isn’t all that unnatural to me.

Otherwise, I usually err on the side of running a higher cadence.

12-23 (12,13,14,15,16,17,18,19,21,23).

Take it you don’t get to the Clermont area much!

Where’s Clermont?? :wink:

I suggest that you are being too particular about your gearing =)
.

I’m also in FL and use an 11-23 on my race wheels. It works pretty well for me. We don’t have many hills (other than the Ringling Bridge over Sarasota Bay), but the wind can be pretty fierce at times.

I’ve also got a SRAM 12-26 that I’ll swap out depending on the conditions and where I’m riding.

Mark

Looking to get a Powermeter so I have been analyzing my gearing. I currently rid 53/39 with 11-23 in the flats of Florida.

After comparing all of my options (compact vs. standard etc…), and considering the value of an 18t cog, Ive decided the perfect setup for me is 53/39 with 12-21t cassette.

After finding this, the search for the 12-21 is endless. I believe the only option was the Shimano DA CS-7800, but I cant even find that.

Any help or suggestions? Im a ~22mph HIM rider and do frequent group rides in the 20mph range. My “hills” are bridges!

10 speed? Check out Miche, KCNC, or other boutique brands.

-SD

Check out Miche, KCNC, or other boutique brands.

-SD

Ouch! $$$$

I suggest that you are being too particular about your gearing =)

+100

Who says changing cadence just a hair once in a while is such a bad thing?

If you run 8sp you could custom pick all of your rear cogs.

look at the gear inches, a 50 x 17 would be almost identical and should give you a decent chainline. If you ran a 52 you would need a 17 1/2 to get where you want to be.