진정 뻘짓, RD6800GS의 10단 적용? -> 불가

요새 위글, 에반스 등에서 구동계, 각종 용품들을 어마어마한 할인율을 적용해서 떨이처리를 하고 있다.

아마도 올해부터 슬 바람이 제대로 불어 내년 쯤부터는 자리를 잡을 디스크형 구동계를 대비하기 위함이려나?

여러 몰들을 보면 이제는 절대 팔리지 않을 것 같은 악성재고들(9단, 10단)을 아직도 목록에 올려두고 있으니 가능한 얘기같기도.

얼마 전에 52-36으로 크랭크는 교체했고, 카세트는 12-27로 사용하기로 했으나,

1. 가끔 한 번씩은 30이나 32대의 안락함을 느껴보고 싶기도 하고..=_=

2. 구동계 가격이 너무 싸고 =_=;;

해서 혹시나 RD6800GS를 현재 사용 중인 10단 구동계에 적용하면 어떨까? 하는 뻘짓 of 뻘짓스러운 생각이 들었다.

아마도 당연히 행정거리가 다를 수 밖에 없는 기계식 구동계의 변속기 가지고 이런 생각부터 하는게 나 스스로도 (얘 뭐야 0ㅅ0) 싶지만.

일단은 검색

http://velonews.competitor.com/2013/09/bikes-and-tech/technical-faq/technical-faq-drivetrain-compatibility-for-10-and-11-speed_301392

Using an 11-speed Ultegra derailleur in a 10-speed system

Dear Lennard,
Can I drop an Ultegra RD-6800 GS rear derailleur into a 6700 system with the intention of moving to a 10-speed 12-32T cassette? I’m pretty sure I could do it with a RD-6700 GS, but if I could “step up” and put more money into the economy, what the hell? I’m fearing the newly-designed cables could be my downfall, leading to needing the right shifters and then the whole system is committed to 11-speed.
—Bruce

Dear Bruce,
Yes, you could certainly do it with the 6700 GS rear derailleur. Depending on the length and orientation of your derailleur hanger, you may need to really crank in the b-screw, or even turn it around and put it in from the backside to get it to rotate the derailleur further back, but it will work.

As for using the 11-speed 6800 GS rear derailleur, I haven’t tried it. I’m not sure why you’d want to put that in unless you’re planning on gradually converting your whole bike to that over time. I’d be surprised if it didn’t work, but no guarantees. It is possible that the wider 10-speed chain might scrape a bit through the narrower jockey wheel cage, but when we went from 9-speed to 10-speed, it wasn’t an issue running a 9-speed chain through a 10-speed rear derailleur on a 9-speed system. There has been a change in cable pull ratio for the new 11-speed Shimano front derailleurs, so I doubt you could substitute one of those into your system, but I don’t have knowledge of that having happened with the rear shifting.

As for the cables, the new cables for Shimano 11-speed are coated and the housing is still a standard 4mm diameter. This will work fine on a 10-speed system, and I’d be surprised if standard cables and housing didn’t work with the substitution you’re pondering. Let me know what happens if you try it.

I won’t use my usual method to find out about Shimano compatibility issues in this instance. My source for questions like this, if I haven’t tested it myself, is Shimano VP Wayne Stetina. He is currently bedside with his brother Dale in Boulder Community hospital after a terrible bike crash on Saturday. Let’s all keep them in our thoughts for Dale’s full recovery. Updates are here.
―Lennard

Read more at http://velonews.competitor.com/2013/09/bikes-and-tech/technical-faq/technical-faq-drivetrain-compatibility-for-10-and-11-speed_301392#hKDjYUs2vIhlLIdw.99


여기까지 읽어보고서는,
음? 시도를 해볼까? 싶은 느낌도 있었음. 뭔가 찜찜하기는 하지만.

---

http://velonews.competitor.com/2014/07/bikes-and-tech/technical-faq/technical-faq-1011-speed-compatibility_337803

Dear Lennard,
I was reading your Technical FAQ on drivetrain compatibility for 10- and 11-speed yesterday (sadly I consulted it after I started building my new bike). I had the same thoughts as Bruce about using an Ultegra RD-6800 derailleur with 10-speed shifters so that I could use a larger rear cog (for the old man and mountains reason).

Since I used various rear derailleurs in the past, I made the assumption that the RD-6800 would have the same cable pull ratio as the 5700 and 6700 derailleurs. But when I fitted the RD-6800, I found that, when using 10-speed shifters, it only shifted between 8.5 and 9 cogs instead of 10.

So it does look like Shimano have changed the cable pull ratio for the 11-speed rear derailleurs.
— Jeremy

Dear Jeremy,
Yes, that is correct. Shimano’s mechanical road 11-speed cable stroke is a road version of 10-speed Dynasys for mountain bikes (which has a longer cable pull per millimeter of derailleur movement than 9-speed MTB shifters).

One possible solution is to use a Shimano Ultegra RD-6700 long-cage GS version to get the range you want, or even an SS cage if you have a modern carbon frame with vertical dropouts with a Shimano XT 11-32 10-speed cassette and your 10-speed shifters. This is not a Shimano-approved setup, but it will work fine.

Note:
1. The GS cage is basically interchangeable between RD-6700 and RD-6800.

2. The 28T max rear cog capacity of all Shimano road rear derailleurs is based on horizontal, short Campy dropouts of the early 1980s.

3. The key to make it work is not adding chain links. Use the shortest possible big/big chain combination that doesn’t explode so that the small/small combination has no slack and the inner front chainring to the 32T rear combinations doesn’t interfere. Note there is also a 12-30 Ultegra cassette that easily works on modern bikes with the B-Tension screw turned all the way in.

4. Vertical-dropout carbon road bikes generally shift well with the XT 11-34 10-speed cassette, but you need to add two links, use the GS long cage, and reverse the B-Tension screw. This definitely is a case-by-case modification.
― Lennard

Read more at http://velonews.competitor.com/2014/07/bikes-and-tech/technical-faq/technical-faq-1011-speed-compatibility_337803#0xpWJEcSA7d644Mx.99

ㅇ ㅏ ..

요약 :

1. 불 to the 가

2. 10단 레버에 RD-6800을 썼을 때 10단까지 가서 걸리는게 안이고 8.5와 9단 쯤에서 다 풀리고 만다.

    -> RD-6800의 행정거리가 짧다는 얘기.

3. 시마노 기계식 11단 로드용 변속기의 케이블 행정거리는 다이나시스가 적용된 10단 MTB와 동일하다. 예를 들면 XT.

4. SS를 쓰더라도 행어 형상이 아래로 쭉 내려왔고 B텐션 볼트를 다 조져주면 11-32 아무 문제없이 쓸 수 있다.

Since I used various rear derailleurs in the past, I made the assumption that the RD-6800 would have the same cable pull ratio as the 5700 and 6700 derailleurs. But when I fitted the RD-6800, I found that, when using 10-speed shifters, it only shifted between 8.5 and 9 cogs instead of 10.

So it does look like Shimano have changed the cable pull ratio for the 11-speed rear derailleurs.
— Jeremy

아.. 다행이야..

본격 뻘짓하기 전에 이런거 읽어서...

어차피 딱히 난 11단으로 올라가지 않을거야...

그런데,.애초에 11단 생각없고 정 GS가 쓰고 싶으면 6700GS를 사면 되지 나는 왜 6800GS를 가지고 이런 생각을 했을까?

크랭크를 6800으로 바꿨더니 은글슬쩍 그룹셋... 생각이 났나보다 ㅡㅡ;