Options for running an 11-36 cassette with Dura-ace Di2

Discuss light weight issues concerning road bikes & parts.
GeeTee
Posts: 14
Joined: Sun Jun 17, 2012 10:53 am

by GeeTee

Looking to purchase the latest Dura-ace Di2 groupo, but need the flexibility to run an 11-36 rear cassette when required (I do multi-day bike packing adventures across Alps, Pyrenees and Picos). I know from experience that a GS (mid-length) Ultegra Di2 read mech will handle a 36 tooth cassette. So my question is: do I basically need to run an Ultegra GS rear mech to make this work, seeing as I understand Dura-ace only has the options of a short length rear cage cassette that will only accommodate up to a 32.

Thanks in advance team!

ChiZ01
Posts: 203
Joined: Wed Jan 01, 2014 6:20 pm

by ChiZ01

you also get to save alots of money for around 30g extra weight

by Weenie


TobinHatesYou
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Joined: Mon Jul 24, 2017 12:02 pm

by TobinHatesYou

One possible option would be to run a sub-compact crankset up front for those mountainous touring trips, but the Ultegra GS route is more sensible.

There’s also the WolfTooth RoadLink, but using one of those is akin to setting an enormous b-gap with similar drawbacks...very laggy shifting.

RussellS
Posts: 858
Joined: Wed Feb 03, 2010 1:31 am

by RussellS

TobinHatesYou wrote:
Mon Jul 08, 2019 7:50 pm
One possible option would be to run a sub-compact crankset up front for those mountainous touring trips, but the Ultegra GS route is more sensible.
Sub compact crank makes more sense. FSA makes a 46-30 crankset. With standard 11-32 cassette. Low gear of 30x32=24.84 gear inches. Regular compact crankset of 50x34 with the 11-36 cassette gets you a low of 34x36=25.03 gear inches. Identical low gear. You need the long/medium cage Ultegra rear derailleur no matter what. Chain wrap is 37 teeth or 41 teeth.

ooo
Posts: 769
Joined: Sat May 21, 2016 12:59 pm

by ooo

buy dura-ace group with dura-ace ss rd + spare ultegra gs rd,
when you need to install 11-36 cassette in place of road cassette - you can change da to ultegra RD
it will take 10% extra time (over time you need to change cassette or wheel)
changing electronic rd is much easier than mechanical rd change, no need to readjust cable
'

bm0p700f
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Location: Glermsford, Suffolk U.K
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by bm0p700f

You an run an xt di2 RD as well and have a wider range as an option.

spdntrxi
Posts: 2761
Joined: Sat Jul 20, 2013 6:11 pm

by spdntrxi

bm0p700f wrote:
Mon Jul 08, 2019 10:15 pm
You an run an xt di2 RD as well and have a wider range as an option.
The issue with XT(R) is that road and mtb derailliers dont mix in the di2 world... not a issue with 1x ofcourse.

NickJHP
Posts: 232
Joined: Wed Feb 14, 2018 2:22 am
Location: Canberra, Australia

by NickJHP

You could use SRAM Red eTap with WiFli RD. I know the WiFli RD copes with an 11-36, because I'm using it with that on my Open U.P.P.E.R.

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wheelsONfire
Posts: 2730
Joined: Mon Jul 07, 2014 8:15 am
Location: NorthEU

by wheelsONfire

I use 11-36 with 6870 RD on my Open UP. I just drilled a new hole for the tension spring, so i could do with out Wolftooth road link.
Bikes:

Ax Lightness Vial EVO Race (2018.12.21)
viewtopic.php?f=10&t=156137
Paduano Racing Fidia (kind of shelved)
Open *UP* (2016.04.14)


Ex bike; Vial EVO D

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pdlpsher1
Posts: 2270
Joined: Thu Jul 19, 2012 6:09 pm
Location: CO

by pdlpsher1

On my tandem I'm running 9150 shifters and FD but with a 8050 GS RD. Perfect shifting and no laggy shifts with an XT 11-40 cassette. I'm not running a sub-compact crank since I need the 50x11 for fast descents on a tandem. No RoadLink is needed. The 8050 GS RD also has enough chain wrap capacity for the extreme cross-chain combos (50x40, 34x11). Overall a really good component choice for extreme low gearing. If you have packs on your bike then the 11-40 is a much better choice than a 11-36, and Shimano doesn't even make a 11-36 11-speed cassette. If I ever commit to doing Everesting I'll throw the 11-40 and a longer chain on my half-bike.

alcatraz
Posts: 2049
Joined: Mon Aug 29, 2016 11:19 am

by alcatraz

r8050gs rear derailleur and everything else duraace, it'll work fine and be a great allround bike that can go everywhere. Flats, descents or climbs.

If you want high speed you can look into running an xd freehub and see if you can get a 10-36t cassette. Doesn't sound like much but it's 10%. It's like running a 40t instead of a 36t.

NickJHP
Posts: 232
Joined: Wed Feb 14, 2018 2:22 am
Location: Canberra, Australia

by NickJHP

pdlpsher1 wrote:
Tue Jul 09, 2019 12:39 am
Shimano doesn't even make a 11-36 11-speed cassette.
Sunrace and SRAM both do:
http://www.sunrace.com/en/products/detail/csrx1
https://www.sram.com/en/sram/models/cs-pg-1170-a1

fourfa
Posts: 14
Joined: Mon Sep 26, 2011 3:04 am

by fourfa

FWIW my groadie has a 46/30 crank with 11-32 on road wheels for my local mountainous roads, and 11-36 (sunrace) on wide gravel wheels for bikepacking, fire roads, and touring. I have often been glad for spinning the 30x36 when it gets steep and/or heavy, only sometimes wished for tighter ratios, and only once wished I didn't spin out at 36mph when I got passed by a fast group ride and couldn't stay on.

markdjr
Posts: 89
Joined: Sun Sep 17, 2017 10:21 pm

by markdjr

wheelsONfire wrote:
Mon Jul 08, 2019 11:39 pm
I use 11-36 with 6870 RD on my Open UP. I just drilled a new hole for the tension spring, so i could do with out Wolftooth road link.
Can we get a pic of this mod?

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wheelsONfire
Posts: 2730
Joined: Mon Jul 07, 2014 8:15 am
Location: NorthEU

by wheelsONfire

markdjr wrote:
Tue Jul 09, 2019 6:10 am
wheelsONfire wrote:
Mon Jul 08, 2019 11:39 pm
I use 11-36 with 6870 RD on my Open UP. I just drilled a new hole for the tension spring, so i could do with out Wolftooth road link.
Can we get a pic of this mod?
That would mean i have to take the mech apart again. No, sad to say i'm not keen to fiddle with that.
The tension is higher (on the spring), so you'd take the mech apart and look how the standard hole is drilled.
Then you drill a new hole (look so you'd place it right direction) about 2-2.5mm apart.
Bikes:

Ax Lightness Vial EVO Race (2018.12.21)
viewtopic.php?f=10&t=156137
Paduano Racing Fidia (kind of shelved)
Open *UP* (2016.04.14)


Ex bike; Vial EVO D

by Weenie


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