> >
>

8 to 9 spd question

General Cycling Discussion Have a cycling related question or comment that doesn't fit in one of the other specialty forums? Drop on in and post in here! When possible, please select the forum above that most fits your post!

8 to 9 spd question

08-15-11, 11:19 PM
#1
Lime1GT
Junior Member

Join Date: Aug 2011
Posts: 10
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
8 to 9 spd question

What parts are involved in a convert from 8 to 9spd? Does the rim or axle need to be changed?

Last edited by Lime1GT; 08-15-11 at 11:20 PM. Reason: wording
08-16-11, 12:08 AM
#2
fietsbob
coprolite

Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 40,977

Bikes: 8

Mentioned: 183 Post(s)
Quoted: 6574 Post(s)
Likes: 0
Liked 69 Times in 62 Posts
9 is one more cog crammed in the space of 8, but since the indexing system
is at the opposite, head, end of the cable , you need to buy a new shifter..cassette and chain.

Math question , what gear ratio specifically are you missing in the 8 speed ,
that you see as necessary to switch the drive train over to gain that additional ratio.??
08-16-11, 08:53 PM
#3
Lime1GT
Junior Member

Join Date: Aug 2011
Posts: 10
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by fietsbob
Math question , what gear ratio specifically are you missing in the 8 speed ,
that you see as necessary to switch the drive train over to gain that additional ratio.??
good point.
08-16-11, 09:58 PM
#4
Drew Eckhardt
Senior Member

Join Date: Apr 2010
Location: Sunnyvale, CA USA
Posts: 5,661
Mentioned: 8 Post(s)
Quoted: 258 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by fietsbob
9 is one more cog crammed in the space of 8, but since the indexing system
is at the opposite, head, end of the cable , you need to buy a new shifter..cassette and chain.

Math question , what gear ratio specifically are you missing in the 8 speed ,
that you see as necessary to switch the drive train over to gain that additional ratio.??
I think road riding without an 18 cog sucks and spent a few hundred dollars on the move to 9 cogs (a couple new freehubs, pair of lock rings, new index cam for my right shifter, new jockey wheels and bolts) when Campagnolo discontinued 13-14-15-16-17-18-19-21 which was my favorite cassette in the 8 speed era.

If I wanted one of the 11-32 wide-range cassettes being pushed as triple alternatives I wouldn't be happy with less than fourteen cogs in the form of an 11-12-13-14-15-16-17-18-19-21-23-26-29-32.

In between 10 cogs are the minimum needed to make 13-26/12-23/11-21 acceptable and 11 for 12-25 or 11-23 (Campagnolo doesn't do a 13-29 11 speed although that combination would work).

The astute observer will note that the bike companies are slowly giving back the gear options they took away by phasing out road triples to reduce SKUs and increase profits.

Too bad it will take getting 13 cogs to get back to where we were in 1991 with 50-34 x 12-13-14-15-16-17-18-19-21-23-26-29-32 just matching the range and spacing we could have with 53-39-26 x 13-14-15-16-17-18-19-21. Reaching state of the art in 1997 will take 50-34 x 11-32 14 speed to equal 53-39-26 x 12-21 9 speed.

The other angle is how much overlap you have between rings. While 50-34x13-14-15-16-17-18-19-21-23 9 speed has enough range to take a fit rider anywhere in the Colorado Rockies (34x23 matches 39x26 or 42x28) disregarding the fully cross-chained combinations there's only one cog of overlap (50x21/34x14) which leads to a lot of double shifting with the wrong terrain/wind/fatigue/rest day combination and it's right in the middle of the pleasant solo cruising speed range. An extra cog (10 total) or two would cut-down on that and on the big end would make for better chain lines and less drive train noise on most days.

Last edited by Drew Eckhardt; 08-17-11 at 02:26 PM.
08-17-11, 06:07 AM
#5
Kid A

Join Date: Aug 2009
Location: Alexandria, VA
Posts: 1,778
Mentioned: 0 Post(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I went the other way -- 9 back to 7 speed because I like the extra chain life and don't need the tiny jumps between cogs that a 9 has.

Also, friciton shifting a 9 speed sucks -- but most people don't use friction these days anyway.
08-17-11, 06:17 AM
#6
ClemY
Senior Member

Join Date: Jun 2008
Location: Maryland
Posts: 559

Bikes: Hollands Touring Bike, Schwinn mountain bike, folding bike, tandem and triple

Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I went from 8 to 9 going from a 12-32 to 12-36. The only reason was to get one more low gear for those long, steep hills at the end of the day when I am already tired. It helps me keep the cadence up to help avoid knee problems. I seldom use it, but it is nice to have in reserve.
08-17-11, 07:02 AM
#7
commo_soulja
Senior Member

Join Date: Aug 2008
Location: C-Ville
Posts: 1,146

Bikes: are fun to ride

Mentioned: 0 Post(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by ClemY
I went from 8 to 9 going from a 12-32 to 12-36.

Where did you find a 12-36 9 speed cassette? and which brand/model? thanks
08-17-11, 07:05 AM
#8
10 Wheels
Galveston County Texas

Join Date: Nov 2007
Location: In The Wind
Posts: 30,995

Bikes: 2010 Expedition, 03 GTO

Mentioned: 15 Post(s)
Quoted: 709 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by commo_soulja
Where did you find a 12-36 9 speed cassette? and which brand/model? thanks
__________________
Fred "The Real Fred"
08-17-11, 07:25 AM
#9
ClemY
Senior Member

Join Date: Jun 2008
Location: Maryland
Posts: 559

Bikes: Hollands Touring Bike, Schwinn mountain bike, folding bike, tandem and triple

Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by 10 Wheels
That is a terrific price. I will pick some more spares.
08-18-11, 08:12 AM
#10
HappyStuffing
6 miles per taco, w00t!

Join Date: Oct 2009
Posts: 255
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I do believe that 8-9 speed chains are the same. At least my SRAM chain says so on the box. I know the spacing is a bit tighter on a 9 speed cassette but it must not be tight enough to appreciable affect the chain from shifting.
08-19-11, 01:55 AM
#11
commo_soulja
Senior Member

Join Date: Aug 2008
Location: C-Ville
Posts: 1,146

Bikes: are fun to ride

Mentioned: 0 Post(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by 10 Wheels

Cool, thanks. I'll need one soon for a 1x9 oldie but goodie build.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off