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Single-handed operation; q-factor

Posted: Sat Nov 16, 2019 7:41 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...]

Re: Single-handed operationl q-factor

Posted: Sat Nov 16, 2019 7:52 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.

Re: Single-handed operationl q-factor

Posted: Sat Nov 16, 2019 7:52 pm
by Weenie

Re: Single-handed operationl q-factor

Posted: Sat Nov 16, 2019 11:16 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.

Re: Single-handed operationl q-factor

Posted: Sun Nov 17, 2019 7:36 am
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:

Re: Single-handed operationl q-factor

Posted: Sun Nov 17, 2019 5:32 pm
by themidge
Just rest for as long as it takes to fully heal your collar bone. It's the off-season anyway :noidea:

Re: Single-handed operationl q-factor

Posted: Sun Nov 17, 2019 5:37 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.

Re: Single-handed operation; q-factor

Posted: Sun Nov 17, 2019 5:45 pm
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 :)

Re: Single-handed operation; q-factor

Posted: Sun Nov 17, 2019 8:34 pm
by svendsvin
Graphic from cannondale:
Image

Re: Single-handed operation; q-factor

Posted: Sun Nov 17, 2019 9:56 pm
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.

Sent from my SM-G977B using Tapatalk


Re: Single-handed operation; q-factor

Posted: Mon Nov 18, 2019 2:50 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.

Re: Single-handed operation; q-factor

Posted: Tue Nov 19, 2019 8:49 am
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).

Re: Single-handed operationl q-factor

Posted: Wed Nov 20, 2019 8:18 am
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.

Re: Single-handed operation; q-factor

Posted: Wed Nov 20, 2019 10:22 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)

Re: Single-handed operation; q-factor

Posted: Wed Nov 20, 2019 10:22 am
by Weenie