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If I had a LX 11-32 cassette and wanted to use the 11-12 cogs on a Ultegra 6500 12-27 cassette by taking off the 12-13 cogs and putting on the 11-12 cogs, would that work without adjustments?

The only road cassette I have is a SRAM 12-26 but I was told it wouldn't be good to add the Shimano mtn LX 11-12 cogs to that brand of road cassette. SRAM told me that.

Anyway, all I really want is a light cassette with a 11-27 range. I can handle losing the 28 and 32 but I don't want to give up the 11 cog.

I see some Ultegra 6500 12-27 cassettes on sale for $49 at somewhere about 200+ grams

I suppose with the LX 11-12 cogs and the larger 27 range, that 200 gram weight might be up towards 225g or something. Perhaps its just easier to get a XT 11-32 at about 268 grams.
 

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Perhaps you better take out the 14t, to make the range more smoothly, 11-12-13-15-16-- rather than 11-12-14-15-16--. I've ordered special Ultegra cogs for it, but if you look carefully as spacing I;m sure it will be okay.
 

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Cloxxki said:
Perhaps you better take out the 14t, to make the range more smoothly, 11-12-13-15-16-- rather than 11-12-14-15-16--. I've ordered special Ultegra cogs for it, but if you look carefully as spacing I;m sure it will be okay.
i did that with all DA cogs but had problems with shifting. it would hesitate between 13-15 when upshifting. the shifting ramps aren't aligned anymore so the chain will have more trouble going up.

i should get 11-27 Titanium cassettes soon with exactly the gears you meantioned above to have evenly distributed gears.
 

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You can probably order replacement 11, 12 and 13 tooth sprockets from Cycle Dynamics that have the ramps lined up with your existing cogs. It's been a while since I have done business with them but I remember that they were very helpful when I did.
 

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Surely the shifting difference between the new 13-15 combination wouldn't be too bad though??

Usually the sprockets have at least 2 or 3 teeth profiled, so even if they were a few teeth out, it should still shift OK.

I think I could put up with a slightly slower shift if I could get the 11 tooth back. :D

Cheers, Dave.
 
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