Road rear mech's on MTB's??

Discuss light weight issues concerning mountain bikes & parts.

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hillrider
Posts: 67
Joined: Wed Oct 13, 2010 7:20 pm
Location: Ireland

by hillrider

Fitted an Ultegra 6700 rear mech on my mtb today.Running a 9 spd 32-11 cassette and all seems well on a quick spin around my local road.Only fitted it as it was lighter than an XT rear mech,and cheaper than a XTR one.Will I have any issue's once I go off road?? Any other weight weenie mtbers use road parts on their mtbs??

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theremery
Posts: 2673
Joined: Sun Jun 12, 2005 10:56 am
Location: New Zealand

by theremery

a DA 7800 mech running a 27-12 was semi-common for plantation racing near here. No dramas. They can be tuned light and strong too! It won't be flash if you need really big cogs (I was surprised you managed to get it running well on a 32....the old DA would not have done that)
Updated: Racing again! Thought this was unlikely! Eventually, I may even have a decent race!
Edit: 2015: darn near won the best South Island series (got second in age
-group)..woo hoo Racy Theremery is back!!

by Weenie


nspace
Posts: 323
Joined: Fri May 21, 2010 3:08 am
Location: Milton, Canada

by nspace

I have an Ultegra 6700 on my 1x6, and it has been amazing! I think the combo of the short cage (in my case), smaller cassette stack and stiff springs allowed me to also get away without using a seat tube mounted chain keeper. Done lots of miles on rough terrain and have yet to experience an issue with this setup.

Image

tompho
Posts: 68
Joined: Tue Mar 13, 2012 8:37 am

by tompho

A Lightweight RD can be used with a 11/32 cassette.

TheRookie
Posts: 910
Joined: Wed Jan 18, 2012 4:23 pm
Location: Midlands, United Kingdom

by TheRookie

Ultegra 6700 is sized for a largest cassette sprocket of 28T
http://cycle.shimano-eu.com/media/techd ... 702204.PDF
I doubt it will like the 32T over much, I know the 105 on my daughters we tried (may as well) to go to a 32T and it wouldn't have it.

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

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

by Tom-s

SRAM RED can be used with 11 - 32 cassette's. Like on Robin van Berkels WW Scalpel BBQ.
He modified the RED to be used with grip shifters by adding a small pin to extend the cable pull/gear.

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Tomstr
Posts: 572
Joined: Tue Oct 04, 2011 5:04 pm

by Tomstr

Do you have any pics of that? It sounds like an interesting setup.
Ride it like you stole it

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

by Tom-s

Only found a picture of the cable tune to ajjust for grip shifters in my show your stuff topic on a dutch mtb site.

Edit: Found a pic!
Image

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Lateralus
Posts: 63
Joined: Mon Jul 26, 2010 10:36 am
Contact:

by Lateralus

And he uses it with a 11-32 cassette? Without modifications of the jockey wheels?

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

by Tom-s

He uses standard Extralite jockeys as seen on the pics.
Yep he runs 11 - 32. Told me that with mod's even a 34t cassette would be possible.
His RED weights 123 grams.

nrsnow
Posts: 267
Joined: Fri Aug 11, 2006 2:30 am

by nrsnow

That looks like a nice bike. Clavicula's ...
Ridley Excalibur

Scott Spark LTD 8.15kg (retired)

Giant NRS (Retired)
http://weightweenies.starbike.com/forum/viewtopic.php?f=1&t=104531

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Tomstr
Posts: 572
Joined: Tue Oct 04, 2011 5:04 pm

by Tomstr

OK, i'm going to have to use the P-word. That thing is PORN!

My next rear-mech on the Commençal is going to be SRAM Force of RED for sure.
Ride it like you stole it

skyfire1202
Posts: 214
Joined: Wed Apr 16, 2008 7:43 am
Location: Sapporo City, Hokkaido, Japan
Contact:

by skyfire1202

11-34 is possible with 42-29 using a RD 7900 with Extralite pulleys.

bikemaniack
Posts: 372
Joined: Thu Jul 16, 2009 9:33 pm

by bikemaniack

I think its a C'dale Scalpel

jooo
Posts: 1510
Joined: Wed Feb 02, 2011 3:48 am

by jooo

I guess something for people to take into account, is simply that one combo of cassette and RD that works fine on one bike, may not work on another all that well simply because of the differences in hanger length/position.

by Weenie


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