Top pull or bottom pull?

"Qui si parla Campagnolo" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Spec-ing a bike for a lady with arthritic hands. going to use a sram
FD shifter(ratcheting friction) as she doesn't have thumb strength for
a SRAM or shimano trigger. Question is, same FD, shifter, is under BB
routing an easier effort or not? Engineers to work!!

Routing with the smallest total degrees of turn should have the least
friction and easiest pull, all other things being equal. One of the
unequalizers would be the radius of the turns, where a sharp bend would be
worse than a gentler turn of the same degree of rotation.

That probably makes the top pull slightly easier to pull, but not by much.
Maybe one of those newfangled electric jobs ... or better yet a single front
ring with a wide range rear and then no left thumb is needed at all. If
she's arthritic she probably won't be hammering the 53-12 much anyway ...

But, you already knew all of that.

Jeffrey

Qui si parla Campagnolo said:

Spec-ing a bike for a lady with arthritic hands. going to use a sram
FD shifter(ratcheting friction) as she doesn't have thumb strength for
a SRAM or shimano trigger. Question is, same FD, shifter, is under BB
routing an easier effort or not? Engineers to work!!

I find top pull changers generally to require more hand pressure,
Campagnolo Record OR, Shimano DOXT, Suntour XCPro. Not much experience
with Sram Quarz.

I'd run it on the bottom assuming your arthritic customer isn't going to
have severe mud issues.
--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971

Qui si parla Campagnolo said:

Spec-ing a bike for a lady with arthritic hands. going to use a sram
FD shifter(ratcheting friction) as she doesn't have thumb strength for
a SRAM or shimano trigger. Question is, same FD, shifter, is under BB
routing an easier effort or not? Engineers to work!!

They are meant to work both with the same shifters, so the leverage is
the same. Leaves the friction of the cables. I don't think there is a
lot of difference in that.

Lou
--
Posted by news://news.nb.nu (http://www.nb.nu)

In article <[email hidden]>,

Qui si parla Campagnolo said:

Spec-ing a bike for a lady with arthritic hands. going to use a sram
FD shifter(ratcheting friction) as she doesn't have thumb strength for
a SRAM or shimano trigger. Question is, same FD, shifter, is under BB
routing an easier effort or not? Engineers to work!!

Physically extend the shifter lever?

--
Ryan Cousineau [email hidden] http://www.wiredcola.com/
"I don't want kids who are thinking about going into mathematics
to think that they have to take drugs to succeed." -Paul Erdos

"Qui si parla Campagnolo" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Spec-ing a bike for a lady with arthritic hands. going to use a sram
FD shifter(ratcheting friction) as she doesn't have thumb strength for
a SRAM or shimano trigger. Question is, same FD, shifter, is under BB
routing an easier effort or not? Engineers to work!!

How about using a Sturmey Archer pulley in either arrangement?

Quoted message said:

"Qui si parla Campagnolo" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Spec-ing a bike for a lady with arthritic hands. going to use a sram
FD shifter(ratcheting friction) as she doesn't have thumb strength for
a SRAM or shimano trigger. Question is, same FD, shifter, is under BB
routing an easier effort or not? Engineers to work!!

Dave Reckoning said:

How about using a Sturmey Archer pulley in either arrangement?

Yes, that's been done. As well as a rivnut holding a gear pulley with a
groove cut in it. A customer looped a gear wire aound the left chainstay
with some teflon casing and even that worked.
--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971

On 23 Apr 2007 09:19:22 -0700, Qui si parla Campagnolo

may have said:

Spec-ing a bike for a lady with arthritic hands. going to use a sram
FD shifter(ratcheting friction) as she doesn't have thumb strength for
a SRAM or shimano trigger. Question is, same FD, shifter, is under BB
routing an easier effort or not? Engineers to work!!

IME, the routing is less important than the shifter, the FD spring
tension, and the quality of the cable and housing.

I've had better results from good SRAM gripshifts than from *any*
Shimano ones, BTW. (Yes, I've installed a few of the loathsome
devices for others who do not share my opinion of them. I even keep a
set of them on hand for such occasions.)

--
My email address is antispammed; pull WEEDS if replying via e-mail.
Typoes are not a bug, they're a feature.
Words processed in a facility that contains nuts.