6857円 Shimano Ultegra 6800 11-Speed 12t 1st position Cassette Cog by Shimano スポーツ&アウトドア 自転車 自転車パーツ Ultegra,11-Speed,position,6800,1st,/pref/14,by,Cassette,スポーツ&アウトドア , 自転車 , 自転車パーツ,Cog,6857円,www.riverviewchildrenscenter.org,12t,Shimano,Shimano 6857円 Shimano Ultegra 6800 11-Speed 12t 1st position Cassette Cog by Shimano スポーツ&アウトドア 自転車 自転車パーツ Shimano Ultegra 6800 ギフ_包装 11-Speed 12t Cog by Cassette 1st position Shimano Ultegra 6800 ギフ_包装 11-Speed 12t Cog by Cassette 1st position Ultegra,11-Speed,position,6800,1st,/pref/14,by,Cassette,スポーツ&アウトドア , 自転車 , 自転車パーツ,Cog,6857円,www.riverviewchildrenscenter.org,12t,Shimano,Shimano

Shimano Ultegra 6800 ギフ_包装 11-Speed 12t スピード対応 全国送料無料 Cog by Cassette 1st position

Shimano Ultegra 6800 11-Speed 12t 1st position Cassette Cog by Shimano

6857円

Shimano Ultegra 6800 11-Speed 12t 1st position Cassette Cog by Shimano

商品の説明

Tooth Count: 12;Shimano Dura-Ace CS-9000 amp; Ultegra CS-6800 11-Speed Cassette Cogs

Shimano Ultegra 6800 11-Speed 12t 1st position Cassette Cog by Shimano

This is a very particular product for a very specific purpose. The way modern Shimano cassettes are built, the largest three cogs are always attached together, the middle 5-6 cogs are individual gears, and the smallest two cogs are built in a special way. The smallest cog is made so the cassette lockring threads into it, and the second to the smallest cog is made to mediate between the odd small cog and the normal third cog.This cog is made to fill that weird first cog position. But you'll also notice that it has 12 teeth, while most modern cassettes have an 11 tooth small cog, which dictates a 13 tooth second cog. Your normal cogs will start at 14t on the third smallest position.I bought this cog along with  this  cog and another regular 15t cog in order to turn my 11-32t cassette into a more usable 12-32t cassette. I don't find my 11t cog very useful, especially when I'm not racing, and having more closely spaced gears in the middle of the cassette where I actually use them is much more useful. In this case, I now have single tooth jumps from 12-16t, and my biggest jump is from 16-18t instead of from 14-16t. Everything runs and shifts as smoothly as it ever has.I also later used the new 12t and 13t cogs (and another 16t cog) to modify my 11-28t cassette into a 12-28, and that also worked very well.This part is somewhat overpriced at $7, especially when you can get some complete 105 11spd cassettes for as low as $30. But if you just want to do a conversion like I did, it's what you need.
Used (along with 13t 2nd position) to replace the silly OE 11/12t combo on both Ultegra 6800 and SRAM 22.Dura Ace and 6800 are identical part, btw.
It works for my application

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