2005 XT reverse indexing

In article <[email hidden]>,

Quoted message said:

Just had a bike put together and lo and behold the right side 9 speed
shifter is in reverse from previous models!

You have a "rapid-rise" rear derailleur. You want a normal-rise derailleur.

Thanks,

will get that switched out.

L.

Quoted message said:

Thanks,

will get that switched out.

You might want to give it a shot. Some people prefer Rapid Rise ("Low
Normal"😉 RDs.

Bill "not /me/ mind you (actually, never owned one)" S.

Bill Sornson said:

Quoted message said:

Thanks,

will get that switched out.

You might want to give it a shot. Some people prefer Rapid Rise ("Low
Normal"😉 RDs.

Bill "not /me/ mind you (actually, never owned one)" S.

I heard somewhere, sometime, that 70% of people who use regular derailleurs
are faster as a result. And they're more attractive to the opposite sex.
Just a thought.

--
Phil, Squid-in-Training

Someone said:

Quoted message said:

Just had a bike put together and lo and behold the right side 9 speed
shifter is in reverse from previous models!

An anonymous poster replied:

Quoted message said:

You have a "rapid-rise" rear derailleur.

Right, more properly known as "low normal."

Quoted message said:

You want a normal-rise [sic] derailleur.

Oh? How do you know that?

Low-normal gives improved performance on downshifts, and many people
prefer them, once they get used to the opposite direction control
(matches the front!)

Sheldon "Why Be (High) Normal?" Brown
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Harris Cyclery, West Newton, Massachusetts
Phone 617-244-9772 FAX 617-244-1041
http://harriscyclery.com
Hard-to-find parts shipped Worldwide
http://captainbike.com http://sheldonbrown.com

Sheldon Brown said:

Low-normal gives improved performance on downshifts, and many people
prefer them, once they get used to the opposite direction control
(matches the front!)

Why does it give improved performance on downshifts? Is it because those
downshifts, pulled by the spring instead of the cable, are more accurate?

Jasper

I said:

Quoted message said:

Low-normal gives improved performance on downshifts, and many people
prefer them, once they get used to the opposite direction control
(matches the front!)

Jasper Janssen said:

Why does it give improved performance on downshifts?

Good question, wish I knew the answer. I dunno why, but it does.

Quoted message said:

Is it because those
downshifts, pulled by the spring instead of the cable, are more accurate?

Shimano says it's because it prevents the rider from overshooting and
trying to skip over a sprocket to shift two gears at once. They say
this deprives you of the benefit of the Hyperglide ramps and gates.

That may well be true as far as it goes, but it doesn't completely
explain the effect.

I first noticed this back in the early '60s with ancien Cyclo freewheels
that didn't have any ramps or gates.

It was quite noticeable when I replaced my old Benelux Mark VII with a
Hurét Alvit.

Overall, the Hurét improved shifting, but with the (high normal) Hurét,
upshifts were smoother and easier than downshifts, while with the old
(low normal) Benelux _downshifts_ were smoother and easier than upshifts.

My guess is that it has to do with cable friction and stretch.

Sheldon "Can't Explain Every Observed Pbenomenon" Brown
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Harris Cyclery, West Newton, Massachusetts
Phone 617-244-9772 FAX 617-244-1041
http://harriscyclery.com
Hard-to-find parts shipped Worldwide
http://captainbike.com http://sheldonbrown.com

Sheldon Brown said:

I said:

Quoted message said:

Low-normal gives improved performance on downshifts, and many people
prefer them, once they get used to the opposite direction control
(matches the front!)

Jasper Janssen said:

Why does it give improved performance on downshifts?

Good question, wish I knew the answer. I dunno why, but it does.

Fair enough. Thanks.

Jasper