Cog Confusion...
02-17-12, 01:33 AM
#1
Member
Thread Starter
Join Date: Nov 2010
Location: Santa Rosa, Kalifornia
Posts: 40
Bikes: Diamondback Sorrento Trek 950 Schwinn Criss Cross none are stock!
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Cog Confusion...
I hope this isn't a repeat.
Where the heck do I find parts to build a custom 7 speed cassette?
I've looked every place I can think of, I'd like to build a 14-34 and can't corner the parts. Suggestions?
Where the heck do I find parts to build a custom 7 speed cassette?
I've looked every place I can think of, I'd like to build a 14-34 and can't corner the parts. Suggestions?
02-17-12, 02:52 AM
#2
Really Old Senior Member
Is a 14-32 acceptable?
https://harriscyclery.net/product/shimano-hg-50-7-speed-cassette-14-32-quotfquot-728.htm
I don't believe you can get a 34T cog in 7 speed, so you'd have to use a 34T off an 8 or 9 speed.
The slightly thinner cog won't be a problem since it's on the end of the "stack".
The problem basically is that it appears the only 7 speed cassette with a 14T top cog is the one listed above.
That means you'd be spending a lot of $ to gain 2 teeth on ONE cog.
https://harriscyclery.net/product/shimano-hg-50-7-speed-cassette-14-32-quotfquot-728.htm
I don't believe you can get a 34T cog in 7 speed, so you'd have to use a 34T off an 8 or 9 speed.
The slightly thinner cog won't be a problem since it's on the end of the "stack".
The problem basically is that it appears the only 7 speed cassette with a 14T top cog is the one listed above.
That means you'd be spending a lot of $ to gain 2 teeth on ONE cog.
Last edited by Bill Kapaun; 02-17-12 at 03:04 AM.
02-17-12, 08:48 AM
#3
Senior Member
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 33,656
Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 2026 Post(s)
Likes: 0
Liked 1,096 Times
in
742 Posts
The era of the "cog board" and the ability to build nearly any possible tooth combination has been over for decades. Between proprietary spacing and the matching of the ramps and shaped teeth needed for indexing, manufacturers limit what they offer to the most popular combinations. You can do a mix and match of 7 and 8-speed cogs (use the 7-speed spacers) within reason but it will necessitate buying two or more cassettes or choosing from the few individual cogs still available.
02-17-12, 09:59 AM
#4
Senior Member
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 38,716
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Mentioned: 140 Post(s)
Tagged: 1 Thread(s)
Quoted: 5788 Post(s)
Liked 2,580 Times
in
1,430 Posts
The first issue you'll have is the 14t 1st position sprocket. 1st position sprockets are different from the rest as they must have the spacer built on. This allows the sprocket to overhang the end of the freehub body so the lockring can compress the cassette without bottoming out. If you try to use a loose spacer and mid position sprocket on the outer end, the sprocket will either hang in space, or be hanging by a hair and tear loose under torque.
I don't believe anyone is currently offering 14t 1st position sprockets, but I'm not certain either way so you should check that first before moving forward.
One alternative to using a 14-34 cassette is to go with chainrings about 15% smaller. This will yield similar gearing using a more readily 12-28 or 13-28 cassette.
I don't believe anyone is currently offering 14t 1st position sprockets, but I'm not certain either way so you should check that first before moving forward.
One alternative to using a 14-34 cassette is to go with chainrings about 15% smaller. This will yield similar gearing using a more readily 12-28 or 13-28 cassette.
__________________
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
02-17-12, 12:04 PM
#5
Low car diet
Join Date: Aug 2007
Location: Corvallis, OR, USA
Posts: 2,407
Bikes: 2006 Windsor Dover w/105, 2007 GT Avalanche w/XT, 1995 Trek 820 setup for touring, 201? Yeah single-speed folder, 199? Huffy tandem.
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 4 Times
in
4 Posts
Here's a 13-34 7-speed cassette: https://www.google.com/products/catal...ed=0CDwQ8wIwAQ
02-17-12, 12:10 PM
#6
Low car diet
Join Date: Aug 2007
Location: Corvallis, OR, USA
Posts: 2,407
Bikes: 2006 Windsor Dover w/105, 2007 GT Avalanche w/XT, 1995 Trek 820 setup for touring, 201? Yeah single-speed folder, 199? Huffy tandem.
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 4 Times
in
4 Posts
Here's a 13-34 7-speed cassette: https://www.google.com/products/catal...ed=0CDwQ8wIwAQ
02-17-12, 05:58 PM
#7
Really Old Senior Member
03-17-12, 09:09 AM
#8
Member
Thread Starter
Join Date: Nov 2010
Location: Santa Rosa, Kalifornia
Posts: 40
Bikes: Diamondback Sorrento Trek 950 Schwinn Criss Cross none are stock!
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Thanks everyone,
I found a whole drawer full off cassettes in the local
Community bike shop...
I'm building my own!
I found a whole drawer full off cassettes in the local
Community bike shop...
I'm building my own!
03-17-12, 10:10 AM
#9
Bianchi Goddess
Join Date: Apr 2009
Location: Shady Pines Retirement Fort Wayne, In
Posts: 27,858
Bikes: Too many to list here check my signature.
Mentioned: 192 Post(s)
Tagged: 2 Thread(s)
Quoted: 2930 Post(s)
Liked 2,926 Times
in
1,491 Posts
Despite the promise of truly custom sets I don't think I ever saw any single cogs except for a few Dura Ace ones, very early on in the HG/UG cassette era
__________________
“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk
“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk
03-17-12, 10:19 AM
#10
Senior Member
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 38,716
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Mentioned: 140 Post(s)
Tagged: 1 Thread(s)
Quoted: 5788 Post(s)
Liked 2,580 Times
in
1,430 Posts
Custom cassettes cannot be built without sacrificing some of the "hyper" in glide.
The positions of the shift gates are phased with the neighboring sprockets so the shifting chain meets the new sprocket with the spaces lined up with the teeth that have to engage them. When you mix/match you lose this phasing, and a shifting chain may meet the new sprocket with a roller lining up with a tooth rather than the space between them. This can cause some minor delay or skipping when shifted under a bit of load. This isn't a crisis,since we got along without gates for decades, but manufacturers don't encourage it since it's contrary to their marketing message.
The positions of the shift gates are phased with the neighboring sprockets so the shifting chain meets the new sprocket with the spaces lined up with the teeth that have to engage them. When you mix/match you lose this phasing, and a shifting chain may meet the new sprocket with a roller lining up with a tooth rather than the space between them. This can cause some minor delay or skipping when shifted under a bit of load. This isn't a crisis,since we got along without gates for decades, but manufacturers don't encourage it since it's contrary to their marketing message.
__________________
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
03-17-12, 02:20 PM
#11
Senior Member
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 33,656
Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 2026 Post(s)
Likes: 0
Liked 1,096 Times
in
742 Posts
"Cog boards" predate cassettes by quite a bit. "Back in the day", every well equipped bike shop had a Sun Tour, a Shimano and the good ones, a Campy cog board that was a large board with pegs and the outlines of evey cog size and configuration they offered. You bought them individually to bulid a custom freewheel or to replace specific worn cogs on your existing freewheel.
03-17-12, 03:40 PM
#12
Mechanic/Tourist
Thread
Thread Starter
Forum
Replies
Last Post
daveizdum
Bicycle Mechanics
7
10-29-10 01:38 AM
