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Discussion Starter · #1 ·
I have a Bontrager race cross 46/38 front crank and a Sram PG950 12-26 9 spd cassette circa 2006. I would like get a lower gearing, can I just swap out the 26 rear cog for a larger one? I have shimano 105 derailers and brifters
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I have a Sora med. cage derailleur and a 12-26 Sram PG-850 cassette. What I did was remove the 13 tooth (which is not dished on 8 spd cassettes) and installed a 30T on the big end of the cassette and shifted all of the other gears down omitting the 13T. There's a big jump from 12-15 on the higher end of the cassette, but I rarely used the 12T or 13T anyways, so no big deal. I have more useful gearing with this setup.

I believe that Shimano states that the biggest cog my derailleur will take is a 27T, but I've been running a 30T for a while with no problems at all. It still shifts great. Your results may vary.
 

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Discussion Starter · #4 ·
croscoe said:
I have a Sora med. cage derailleur and a 12-26 Sram PG-850 cassette. What I did was remove the 13 tooth (which is not dished on 8 spd cassettes) and installed a 30T on the big end of the cassette and shifted all of the other gears down omitting the 13T. There's a big jump from 12-15 on the higher end of the cassette, but I rarely used the 12T or 13T anyways, so no big deal. I have more useful gearing with this setup.

I believe that Shimano states that the biggest cog my derailleur will take is a 27T, but I've been running a 30T for a while with no problems at all. It still shifts great. Your results may vary.
Where did you get the 30T? Harris only has a 29T
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I'm a big fan of the 30t, putting it on when I go to the mountains, taking it off for around home. Works great with a compact up front. Frankly I think a lot of cyclists, and not just 50-somethings like myself, would benefit if they weren't too vain to be seen with big gears in back. Hills are a blast if I can spin above 80 rpm. I've had best luck using a short deraileur in the back for some reason with this setup.

Check out the following sources for sprockets that can be added to a 12-27

http://harriscyclery.net/page.cfm?PageID=49&action=list&Category=705&Brand=572&type=T&startRow=1

9 speeds: http://harriscyclery.net/itemdetails.cfm?id=800
 

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Discussion Starter · #7 ·
yakobo said:
I'm a big fan of the 30t, putting it on when I go to the mountains, taking it off for around home. Works great with a compact up front. Frankly I think a lot of cyclists, and not just 50-somethings like myself, would benefit if they weren't too vain to be seen with big gears in back. Hills are a blast if I can spin above 80 rpm. I've had best luck using a short deraileur in the back for some reason with this setup.

Check out the following sources for sprockets that can be added to a 12-27

http://harriscyclery.net/page.cfm?PageID=49&action=list&Category=705&Brand=572&type=T&startRow=1

9 speeds: http://harriscyclery.net/itemdetails.cfm?id=800
I just ordered the 30T from Harris
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