Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

Custom Cassette ratio

Old 04-29-12, 01:36 PM
  #1  
TrojanHorse
SuperGimp
Thread Starter
 
TrojanHorse's Avatar
 
Join Date: Mar 2010
Location: Whittier, CA
Posts: 13,145

Bikes: Specialized Roubaix

Mentioned: 135 Post(s)
Tagged: 0 Thread(s)
Quoted: 1012 Post(s)
Liked 23 Times in 18 Posts
Custom Cassette ratio

I waiting for my new compact crank to arrive to replace my standard crank. I'm currently using a 12-26 SRAM force cassette and in the interests of riding up some steep hills (and because the compact only goes to 50) I was thinking of replacing the cassette with an 11-28.

The 12/26 includes: 12,13,14,15,16,17,19,21,23,26

The 11/28 includes: 11,12,13,14,15,17,19,22,25,28

Has anybody ever mixed and matched cogs? I'm thinking I'd rather have a 16 than a 12. I rarely use the smallest cog unless I'm bombing down a hill so I can't imagine missing a 12 much. I don't know if there would be shifting issues going from 13 to 11 though.
TrojanHorse is offline  
Old 04-29-12, 02:39 PM
  #2  
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 41,632

Bikes: 8

Mentioned: 188 Post(s)
Tagged: 0 Thread(s)
Quoted: 6838 Post(s)
Likes: 0
Liked 217 Times in 180 Posts
Older shimano cassettes had 3 bolts holding a bunch of cogs together.

You can tear those down and change pieces.

newer stuff , makes sub carriers in 1 piece, of alloy,
so, more compatible with lighter non steel freehub splines.

& then only the top 2 smallest cogs are loose.
fietsbob is offline  
Old 04-29-12, 07:35 PM
  #3  
Al1943
Senior Member
 
Join Date: Feb 2005
Location: Oklahoma
Posts: 9,438

Bikes: Trek 5500, Colnago C-50

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
My recommendation would be to use the 12,13,14,15,16,17,19,22,25,28. The 13 to 11 jump would be too big. The 12 needs to be the first position cog with the built-in spacer. The 50 - 12 combination would be big enough, good for at least 33 mph at 100 crank rpm.
Al1943 is offline  
Old 04-29-12, 08:51 PM
  #4  
TrojanHorse
SuperGimp
Thread Starter
 
TrojanHorse's Avatar
 
Join Date: Mar 2010
Location: Whittier, CA
Posts: 13,145

Bikes: Specialized Roubaix

Mentioned: 135 Post(s)
Tagged: 0 Thread(s)
Quoted: 1012 Post(s)
Liked 23 Times in 18 Posts
If I recall, SRAM Force cassetttes have separate spacers for each cog - nothing pre-welded like my old Shimano stuff. I could be mistaken, I'll know for sure in about 2 days when I take it apart again.

So Al - why do you say it would be too big? That's my suspicion but I'm wondering what the reason is.
TrojanHorse is offline  
Old 04-29-12, 09:06 PM
  #5  
Al1943
Senior Member
 
Join Date: Feb 2005
Location: Oklahoma
Posts: 9,438

Bikes: Trek 5500, Colnago C-50

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
In most riding conditions shifting from the 13 to the 11 will instantly cut your cadence and momentum too much unless you are charging down a steep hill. There will be more situations where the 12 will fit your needs better. Empirical studies have shown that most riders perform best in a cadence range of about 85 to 105 rpm.
Al1943 is offline  
Old 04-29-12, 10:51 PM
  #6  
TrojanHorse
SuperGimp
Thread Starter
 
TrojanHorse's Avatar
 
Join Date: Mar 2010
Location: Whittier, CA
Posts: 13,145

Bikes: Specialized Roubaix

Mentioned: 135 Post(s)
Tagged: 0 Thread(s)
Quoted: 1012 Post(s)
Liked 23 Times in 18 Posts
OK, I was afraid you'd say something about technical performance. The only time I reckon I"ll be in the 11 is exactly charging down a steep hill.

I'll probably try the 11-28 as-is for a while to see if I miss the 16. I have no way to track which cogs I'm normally in without looking backwards and I haven't been that interested in it till now. If I find too large of a gap, I may become interested.
TrojanHorse is offline  
Old 04-30-12, 12:18 AM
  #7  
Chris_W
Likes to Ride Far
 
Chris_W's Avatar
 
Join Date: May 2007
Location: Switzerland
Posts: 2,281

Bikes: road, commuter/tourer, hardtail MTB, touring tandem, cargo, folder

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 20 Post(s)
Likes: 0
Liked 1 Time in 1 Post
The problem with the SRAM 11-28 cassette for me is the big jump from 19 to 22, right near the middle of the cassette. I gave up on this cassette for this reason. Shimano's 11-28 cassette avoids this by putting a 4-tooth jump at the top end (24 to 28), which is an improvement. However, I also don't feel like the 11 tooth is necessary, so prefer a 12-28 or 12-30, which Shimano now make as part of the Tiagra series; a new lighter, Ultegra-level version should be becoming available this summer.
Chris_W is offline  
Old 04-30-12, 02:51 AM
  #8  
Kimmo
bike whisperer
 
Kimmo's Avatar
 
Join Date: Dec 2009
Location: Melbourne, Oz
Posts: 7,961

Bikes: https://weightweenies.starbike.com/forum/viewtopic.php?f=10&t=152015&p=1404231

Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 388 Post(s)
Liked 18 Times in 15 Posts
Originally Posted by TrojanHorse View Post
If I recall, SRAM Force cassetttes have separate spacers for each cog - nothing pre-welded like my old Shimano stuff.
Welded? No.

Old Shimano cassettes may be rivetted together. Easy to drill out the rivets too; they're not necessary.
Kimmo is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
hbax101
Want To Buy
1
08-19-18 08:54 PM
AzharMohamad
Introductions
2
11-15-12 08:21 PM
Cead_tinne
Bicycle Mechanics
20
04-17-12 09:57 PM
Early Seven
Mountain Biking
0
01-17-11 02:50 PM
cpsqlrwn
Road Cycling
0
05-03-08 03:26 PM

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


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.