Impossible to have 38-26T Crank on scott scale?

Discuss light weight issues concerning mountain bikes & parts.

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zik
Posts: 31
Joined: Sun Jan 28, 2007 11:07 am

by zik

Hi,
I would install on my 2008 scott scale new drive with xtr trail crank 38-26T but to do this I need proper front derailleur, scott is designed to e-type front derailleur.
XTR have 2 types of Etyp derailleur:
FD-M985-E (this is model for my scott but work with only 40-44T top gear teth)
FD-M985-E2 (e-type without BB plate, but scott scale have only one bottom bracket mount in seat tube, this derailleur needs two mounts)
Clamp based derailleurs are: 28.6, 31.8, 34.8mm and my seattube is over 38mm.
This is very strange for me that this crank can't be used on scott scale.

Tom-s
Posts: 144
Joined: Sat Apr 26, 2008 10:44 pm
Location: Holland/Belgium

by Tom-s

It may be possible by using a road front derailleur in combination with a braze on clamp in the right size.
http://www.smud-carbon.eu makes them in every size you need.

by Weenie


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Mads Kock
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by Mads Kock

You can use the Sram XX 38.2mm high mount top pull on your frame :-)

Otherwise - I tried with an e type xt front derailleur and even thought the cage was sitting a bit high it worked fine. The sram xx is 118,5 grams so much lighter.

zik
Posts: 31
Joined: Sun Jan 28, 2007 11:07 am

by zik

but read this:
http://blog.performancebike.com/2011/01/28/spin-doctor-tech-tip-10-speed-mtb-drivetrain-compatibility/
new XTR Dyna-SYs is only compatible with components in the Dyna-Sys lineup so any other derailleur like Sram or Road 7900 will not work.

TheRookie
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Location: Midlands, United Kingdom

by TheRookie

No physical reason it won't work, Shimano want you to only buy Shimano kit after all!

Simon
Impoverished weight weenie wanna-be!
Budget 26" HT build viewtopic.php?f=10&t=110956

zik
Posts: 31
Joined: Sun Jan 28, 2007 11:07 am

by zik

@Mads Kock
are you sure you succesfully used FD-M985-E derailleur with FC-M980 38-26T crank and this worked?

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Mads Kock
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by Mads Kock

zik wrote:@Mads Kock
are you sure you succesfully used FD-M985-E derailleur with FC-M980 38-26T crank and this worked?


Nope - but I have used an old FD-M760-E with Sram XX 39-26T crank q156mm and it worked fine.

zik
Posts: 31
Joined: Sun Jan 28, 2007 11:07 am

by zik

so I think I will go with Sram XX high clamp top pull 38.2 with my new XTR dynasys drive - but I have to be 100% sure so does different chain line between xtr (46.8mm) and sram (49.5mm) will not cause any issues?

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Mads Kock
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by Mads Kock

If you current have an e-type front derailleur on your bike - how about getting the XTR rear derailleur, cassette and triggers and try it with your old front derailleur. I think this would be the best option for you.

I don't think the difference in the chainline between XTR and XX would be any problem - this can be adjusted with the limited screws. What could be a problem is how much pull the xtr trigger on the front. I had problems when I changed from the x.0 gripshift to the XX triggers. Then I couldn't use my road front derailleur.

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yourdaguy
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by yourdaguy

The chainline should not be an issue. Almost any FD should be able to accommodate that much difference.
For certain parts stiffer is more important than lighter.

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schmiken
Posts: 336
Joined: Sat Jun 30, 2007 9:53 am

by schmiken

I use an XTR E Type on my Scott Scale running 28-40. Works fine.

zik
Posts: 31
Joined: Sun Jan 28, 2007 11:07 am

by zik

yes, because e-type is designed to work with all big chainrings between 40-44T so no problem here

eimart
Posts: 9
Joined: Fri Apr 26, 2013 2:42 am

by eimart

Having the same problem here,
i have a M980 crankset (38-26T) on my Spark 900 2013. And i am looking for a Xtr Front Der. that is compatible with the Spark frame and with the 38T ring.
It doesnt exist.
The M985-E is compatible with Spark , but it is designed to work with 40-44T only.
And the M985-E2 is compatible with 38T . But it is not compatible with Spark mount.

Dont know what to do.

by Weenie


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