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Shimano Ultegra CS-6600 Sprocket - 18T - 1ZD 1800-E

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Questions & Answers (1) Q & A
For Shimano Ultegra CS-6600 10spd Cassettes, this sprocket should be used with the following cassette ratios:

- 12-23T

Cassette requires the Shimano TL-LR15 Lock Ring Removal Tool.

Genuine Shimano replacement part.
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Questions & Answers (1)
Correct Cog For Cassette
06 Sep 2016
Hi There

I have a road bike with 105 5700 group set on it. It's 10 speed.

I'd like to change the ratios on my cassette by adding in a 16T and 18T and maybe then stopping it at 12T (Currently 11T)

Question is do the Ultegra Cogs you sell work fine as these are the only 16 and 18T cogs I can find?

Also do I need to buy a new 12T for the end as currently I have an 11T cog at the end. I think the last cog needs the built in metal spacer.

Many thanks

SJS Customer Service:

These Ultegra cogs should be suitable for use in conjunction with your 105 cassette. If you want to stop the cassette at 12T then it would be advisable to purchase a new 12T that is designed as an end sprocket and a lockring to match otherwise you may not be able to tighten your cassette up suitably.