Will a RD6800SS fit a 30T cassette?

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zalle
Posts: 72
Joined: Sun Sep 25, 2016 11:14 pm

by zalle

I have a 12-30 cassette, will the RD6800SS fit? The RD6700 has 30T written on it, but I believe the 6800 does not.

I know shimano say that SS is for 28T and GS is for 32T... But I want to know the truth! :P

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benzebub
Posts: 354
Joined: Thu May 07, 2015 1:24 pm

by benzebub

it depends on your rear derailleur hanger.. if it is long enough it will work.
My chorus derailleur has a 29t limit but I've got it to work with a 32t shimano cassette so nothing is written in stone..
But I could be wrong

Kurets
Posts: 159
Joined: Thu Feb 25, 2016 9:55 pm

by Kurets

Exactly, it might work, it might not. I have heard of people making the RD-6500-SS work with 30T+ cassettes and that one is only specced for 27t max. There is no way to figure out without trying unless you can find someone with the same frame that has tried it before you.

zalle
Posts: 72
Joined: Sun Sep 25, 2016 11:14 pm

by zalle

So I should buy one which I can return...?

zalle
Posts: 72
Joined: Sun Sep 25, 2016 11:14 pm

by zalle

Well, so I put the RD6800SS on my 10 speed 12-30 cassette and it fits perfectly!

Jhomewood
Posts: 231
Joined: Fri Feb 22, 2013 8:30 am

by Jhomewood

"it will work" vs "it will work well" are two very different things. i went long cage this year and i'll never go back, running in the big-big is much smoother now (not that i do it often)

Hexsense
Posts: 3270
Joined: Wed Dec 30, 2015 12:41 am
Location: USA

by Hexsense

For 11-28 or 30 which likely work on both mid cage and short cage you should decide from your hanger's length.
If it is short then you are safer buying a mid cage one.
Otherwise...
mid cage vs short cage version of the same derailleur can also different in B-knuckle length and other parts not just the cage.
On my bike, my RD hanger are pretty long and Mid cage RD has longer (go lower) B-knuckle (to clear room for bigger cassette) so i have to back off B-tension screw all the way out to make upper pulley stay relatively close to cassette. And that make my upper pulley go very far forward ahead of the cog and cable entrance are from bad angle (like almost 30 degree down rather than horizontal and or higher than horizontal.

I think i should change to short cage which will give me better cable angle for my long RD hanger bike since it has shorter B-knuckle which then doesn't need me to back off B-tension screw this far.

picture of my bike's rd, I know it's Sram not Shimano but still apply for long cage vs short cage in general.
17692770_10154499972952061_1913233226_o.jpg

spdntrxi
Posts: 5791
Joined: Sat Jul 20, 2013 6:11 pm

by spdntrxi

yes depends on hanger/frame.. as an example I can use a 30T with my 9150 SS but 32T won't work on my Parlee Z5SLi. My wifes' 2014' Madone6 can fit the 32T with the same 9150 SS RD.
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Briscoelab
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Joined: Thu Jan 26, 2006 6:01 pm

by Briscoelab

Yes

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