Single-handed operation; q-factor

Discuss light weight issues concerning road bikes & parts.
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claus
Posts: 308
Joined: Fri Oct 31, 2008 10:04 pm

by claus

Two (seemingly unrelated) questions:
- is it possible to program Ultegra/Dura Ace Di2 to do all the
shifting with just the left "shifter"?
Something like sequential shifting, one "button" to shift up, one down
(sorry for my terminology, I never cared about electronic shifting
before so I don't know what to call the parts).
- what are the q-factors of a Cannondale SISL as (factory?) installed
on a Cannondale SuperSix EVO (2018) and a "standard" Dura-Ace?
(a search only showed phrases like "did not increase", "narrow",
but not the actual values :-(

Background for those who read this far: I should not use my right arm.
My crazy idea is to rent/buy a bike with electronic shifting, so I can
brake and shift with just the left hand -- that's the reason for the
first question. The reason for the second is that I found two possible
bikes around here:
- a used Cannondale SuperSix EVO (2018) with Ultegra Di2.
- an "Airstreeem EEE SL" with Dura Ace Di2.
My body is sensitive to a few things when it comes to cycling, one of
those is a narrow q-factor -- 145.5mm for Campagnolo is ok, anything
wider will cause me knee pain (and I don't want to damage them),
hence my questions about the q-factor of those cranks (sorry if
there are different models, I only use Campagnolo and it's hard
to get more info from the people who offer those bikes).

[removed "distracting" info -- too late...]
Last edited by claus on Sun Nov 17, 2019 5:40 pm, edited 2 times in total.

by Weenie


Karvalo
Posts: 1109
Joined: Fri Aug 10, 2018 6:40 pm

by Karvalo

You could very easily setup the left shifter to operate the rear mech and Synchro shift mode to automatically shift the front mech. It's a <5 min job with no additional parts. Otherwise you could plug a 2 button satellite climb switch into the left hand shifter, and use that to manually control front shifting.

NiFTY
Posts: 1368
Joined: Sat May 26, 2012 11:26 pm

by NiFTY

Mate if your collarbone is still so freshly broken that you can't use your hand then trying to ride a foreign bike on the road is incredibly stupid.

I also recently broke my collarbone. Got it plated and for 2 weeks just rode on the stationery trainer until i could get out of the saddle then came back on the road. Waiting full 6 weeks before mtb. If you stress the fracture too early you will get malunion and need surgery.
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Etienne
Posts: 305
Joined: Tue Aug 23, 2005 11:41 am
Location: France

by Etienne

NiFTY wrote:
Sat Nov 16, 2019 11:16 pm
Mate if your collarbone is still so freshly broken that you can't use your hand then trying to ride a foreign bike on the road is incredibly stupid.

I also recently broke my collarbone. Got it plated and for 2 weeks just rode on the stationery trainer until i could get out of the saddle then came back on the road. Waiting full 6 weeks before mtb. If you stress the fracture too early you will get malunion and need surgery.
... sound advice !! Riding outside with a healing broken collarbone is just insane :roll:

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themidge
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Location: underneath sweet Scottish rain

by themidge

Just rest for as long as it takes to fully heal your collar bone. It's the off-season anyway :noidea:

claus
Posts: 308
Joined: Fri Oct 31, 2008 10:04 pm

by claus

It's not the "off season" where I am.

I should not have included that "extra info", maybe then I would have gotten more technical replies like the first one. Hopefully I remember this the next time I ask questions.

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LouisN
Posts: 2904
Joined: Mon Feb 19, 2007 3:44 am
Location: Canada

by LouisN

1) Keep training inside on the home trainer.
2) Switch your shifters on the left side. Or keep them that way and shift only with left hand.
3) Wait for the bone to heal properly.
4) Put shifters back, ride outside (careful at first, even the smallest vibrations, road cracks and potholes are tough on a freshly healed collarbone. Have a good race season !

Louis :)

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svendsvin
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Joined: Sat Mar 31, 2012 12:27 pm

by svendsvin

Graphic from cannondale:
Image

Nefarious86
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by Nefarious86

I hope wherever youre hoping to ride theres no one else around.

Stick to the ergo for 4 weeks.

If you must go outside then di2 set up with syncro shift and a brake splitter designed for parra athletes is about your only option.

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wheelbuilder
Posts: 849
Joined: Wed Feb 08, 2017 2:10 am

by wheelbuilder

quite a bit off topic, but I don't know your backstory............so! Are you "healing" a broken collarbone, or are you recovering from surgery? If surgery, then disregard this post. If healing it, go in and pressure/demand/beg for fixation surgery. Healing it takes a really long time, and is more pain than you have to endure. Plus you run the risk of seeing your ortho and having him tell you "it's not healing right," or "it's not healing fast enough" and you have to get a surgery anyway.
Never cheer before you know who is winning

claus
Posts: 308
Joined: Fri Oct 31, 2008 10:04 pm

by claus

Thanks for the technical info, 144mm q-factor for SiSL should be fine for me;
now let's see if they can make the rest of the bike match my fit
(just handlebar width and stem length left to do).

Karvalo
Posts: 1109
Joined: Fri Aug 10, 2018 6:40 pm

by Karvalo

claus wrote:
Sun Nov 17, 2019 5:37 pm
I should not have included that "extra info", maybe then I would have gotten more technical replies like the first one. Hopefully I remember this the next time I ask questions.
I actually agree with veryone else. Hell, it'd even be cheaper to buy a top end turbo training setup and Zwift subscription than a basic DI2 bike anyway.

Discodan
Posts: 204
Joined: Mon Oct 16, 2017 2:55 am

by Discodan

I won't judge on whether it should be done, but it can be done. Just make sure it's not the older Di2 that didnt' support synchro shifting; you'll need the BT110 battery and a wireless unit (WU111 or similar)

by Weenie


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