Shimano DA 9000 vs 9100 crankset

Discuss light weight issues concerning road bikes & parts.
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ms6073
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by ms6073

Broady wrote:
Thu Dec 28, 2017 2:35 pm
Don't suppose you could elaborate on this? I've just ordered a 9100 chainset and was hoping to put my 9000 Absolute Black Inner ring on.
Sure, tried to swap my AB oval road rings (52/38) from SRM DA 9000 temporarily to a Shimano FC-9100 so i could send in the SRM for service, only to find the shape of the spiders 4th lug prevented the AB 9000 style rings from being installed. Compare the 9000 style ring on top to the new 9100 style ring on bottom and you should see what I am talking about;
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by Weenie


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zank
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by zank

The inner rings are usually fine. I've modified a bunch of Wolftooth, Wickwerks outers, and 46 tooth 6800 rings for customers to go on R9100 and R8000 cranksets for cyclocross bikes. I just wouldn't do it on a Hollowglide ring of course.

Broady
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by Broady

Brilliant, thanks for that.

saverin
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by saverin

XCProMD wrote:
Mon Dec 11, 2017 11:12 pm
On a pure theoretical note: the new version has a higher effective moment of inertia than the old one due to the larger cross section of the crank arm and the fact that the part under the centroid has thicker walls than those above it.


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What are you basing this theoretical assumption on?

glepore
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by glepore

The real change was to allow for shorter chainstays on disc bikes with revised ring profile.
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Calnago
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by Calnago

I think they still specify a minimum chainstay length of 410mm which is the minimum they spec for disc braked frames. The new ring spacing “helps” alleviate some of the chainline issues associated with moving to 135mm rear dropout spacing. If they wanted to still allow for shorter chainstays they would have not designed the rear derailleur the way they did, which on bikes with a combination of shortish chainstays and a largish amount of BB material in the rearward side, can make rear wheel removal a pain in the ass.
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ch00bzs
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by ch00bzs

zank wrote:
Fri Dec 29, 2017 3:08 am
The inner rings are usually fine. I've modified a bunch of Wolftooth, Wickwerks outers, and 46 tooth 6800 rings for customers to go on R9100 and R8000 cranksets for cyclocross bikes. I just wouldn't do it on a Hollowglide ring of course.
so... 9100 inner ring is cross compatible with 9000 crank and vice versa, but not the big ring ?

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ms6073
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by ms6073

Not in my experience. The only way either the inner or out AB rings will work is by using a Dremel or similar tool to modify the shape of that single flange on the rings.
Last edited by ms6073 on Tue May 08, 2018 8:54 pm, edited 1 time in total.
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zank
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by zank

Yes, you are right. I was thinking of the last one I did with a DFour91 crank. Only the outer needed grinding on that crank. The inners did need some work on the R9100.

XCProMD
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by XCProMD

saverin wrote:
XCProMD wrote:
Mon Dec 11, 2017 11:12 pm
On a pure theoretical note: the new version has a higher effective moment of inertia than the old one due to the larger cross section of the crank arm and the fact that the part under the centroid has thicker walls than those above it.


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What are you basing this theoretical assumption on?
I measured the cross section.


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Broady
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by Broady

For anyone else curious, the Absolute Black 9000 inner fits straight on 9100 with no modifications.

Chans1ee
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by Chans1ee

I heard that 9100 crankset cannot use 9000 front/rear derailer, if u want to use 9100 crankset, you have to change front/rear derailer.
I think 9000 crankset is more beautiful.

Broady
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by Broady

Chans1ee wrote:
Fri Jan 05, 2018 11:24 am
I heard that 9100 crankset cannot use 9000 front/rear derailer, if u want to use 9100 crankset, you have to change front/rear derailer.
I think 9000 crankset is more beautiful.
In theory yes but it works fine with 9070 FD.

BdaGhisallo
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by BdaGhisallo

Broady wrote:
Fri Jan 05, 2018 11:25 am
Chans1ee wrote:
Fri Jan 05, 2018 11:24 am
I heard that 9100 crankset cannot use 9000 front/rear derailer, if u want to use 9100 crankset, you have to change front/rear derailer.
I think 9000 crankset is more beautiful.
In theory yes but it works fine with 9070 FD.
The beauty of DI2 is that you can mix and match components. I can't find it now, but I have seen Team Sky Pinarellos running 9170 RDs and 9070 FDs. I guess that way you can get the range of the 9170 RD while optimizing shifting with cranks and rings that may not be 100% 9100 compatible in Shimano's eyes. Most combinations work just fine as many have indicated.

by Weenie


eforce123
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by eforce123

ive ridden both and didnt notice a difference, but I am new to this cycling world. I know some 9000 get the 9100 cassette offered in 30T instead of 28T

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