Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

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.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 11-08-07, 06:57 PM   #1
Bill Kapaun
Senior Member
Thread Starter
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.
Posts: 9,496
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 125 Post(s)
10 speed top cog on 7 speed cassette?

I'm trying to build a "custom" cassette.
I've "found" a 13T "top" cog from a 10 speed and, with its' built in spacer, it's about 1MM "thinner" than a 7 speed top cog (12T that I want to replace).
Can a 1MM spacer be used behind the top cog, or would that result in other problems?
If OK, is the spacer readily available?
Bill Kapaun is offline   Reply With Quote
Old 11-08-07, 08:02 PM   #2
Michel Gagnon
Year-round cyclist
 
Join Date: Apr 2002
Location: Montréal (Québec)
Bikes:
Posts: 3,023
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The only problem is that I'm not sure you will be able to use a spacer in that position. It won't fit in a way that will allow you to slide in the top cog and lockring.
Michel Gagnon is offline   Reply With Quote
Old 11-08-07, 08:13 PM   #3
Al1943
Senior Member
 
Join Date: Feb 2005
Location: Oklahoma
Bikes: Trek 5500, Colnago C-50
Posts: 9,433
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
A 1mm cog spacer should work OK. I'm thinking you may be able to run it without the extra spacer if the lockring will tighten down enough. The high limit screw sets the derailleur for the first position cog, set the indexing for the other cogs with the barrel adjuster.

Al
Al1943 is offline   Reply With Quote
Old 11-08-07, 08:24 PM   #4
Bill Kapaun
Senior Member
Thread Starter
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.
Posts: 9,496
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 125 Post(s)
Thanks for the response.
I was looking at it again and I fear there may not be enough engagement with the splines if I added a simple spacer. It looks like the "proper" top cog has pretty minimal (to me) engagement.
I'd hate to mess up the FH body.
What I was trying to accomplish was convert a-
12-14-16-18-21-24-28 to a
13-14-15-16-18-21-24.
At least the 15T will still be quite useful (I tend to "cruise" between the 14 & 18). I wouldn't use the 13 that much, but it would still be used more than my "unused" 12.
Bill Kapaun is offline   Reply With Quote
Old 11-08-07, 08:34 PM   #5
Bill Kapaun
Senior Member
Thread Starter
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.
Posts: 9,496
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 125 Post(s)
Quote:
Originally Posted by Al1943 View Post
A 1mm cog spacer should work OK. I'm thinking you may be able to run it without the extra spacer if the lockring will tighten down enough. The high limit screw sets the derailleur for the first position cog, set the indexing for the other cogs with the barrel adjuster.

Al
The 13T sits too close to the 14T. I'd have to get a 10 speed chain for my 7 speed cassette. Budget prevents that. I'm not sure if that wouldn't also result in other drive train problems, with my stock 7 speed mountain triple.
I think I'll have to just use the 12T and "enjoy" having the 15T added. If I happen to run into a 13T top cog from a 7 or 8 speed, at a later time, I'll try that.

The bike is an 86 Rock Hopper w/ friction shifters. I can handle a LITTLE bit of irregular cog spacing. Especially if to the top, seldom used, gear.
Bill Kapaun is offline   Reply With Quote
Old 11-09-07, 01:10 AM   #6
erader
Senior Member
 
erader's Avatar
 
Join Date: Feb 2006
Location: silicon valley
Bikes:
Posts: 1,774
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Bill Kapaun View Post
I'm trying to build a "custom" cassette.
I've "found" a 13T "top" cog from a 10 speed and, with its' built in spacer, it's about 1MM "thinner" than a 7 speed top cog (12T that I want to replace).
Can a 1MM spacer be used behind the top cog, or would that result in other problems?
If OK, is the spacer readily available?

http://www.loosescrews.com/index.cgi...d=186037319618
erader is offline   Reply With Quote
Old 11-09-07, 09:59 PM   #7
Bill Kapaun
Senior Member
Thread Starter
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.
Posts: 9,496
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 125 Post(s)
Quote:
Originally Posted by erader View Post
Your link refers to a 2nd position 13T. IF I used it with the 12T top cog, I'd have to give up a more useful cog elsewhere. I didn't see a 13T 1st position listed.
Bill Kapaun is offline   Reply With Quote
Old 11-09-07, 10:16 PM   #8
BikingGrad80
that bike nut
 
BikingGrad80's Avatar
 
Join Date: Jul 2007
Location: Chicago north
Bikes: 2010 Motobecane Immortal Force 90' Trek 1400; 90' Trek 850; 06' Trek 520; 01 Iron Horse Victory
Posts: 934
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 22 Post(s)
Why not just buy the regular 13-23 7 speed cassete? Pretty close. Lickbike sells them for $25.
BikingGrad80 is offline   Reply With Quote
Old 11-10-07, 12:09 AM   #9
Bill Kapaun
Senior Member
Thread Starter
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.
Posts: 9,496
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 125 Post(s)
I currently have a 12-28.
I was doing some "horse trading" and got the 15T and 13T cogs. Had the 13T worked, I would have had a 13-24 with a little better selection for the gears I use the most.
13-14-15-17-19-21-23 (std 13-23)
Mine would have been-
13-14-15-16-18-21-24
The 24 works very good for a start gear on the middle ring for my riding (flat). The 23 is slightly "steeper" than I want, although it would work.
I tend to run between 14-18 for most my "cruising". Usually, the 14 is just a bit too steep where the 15 would fit perfectly. I still want the 1 tooth drop to the 16, since that gear is also used a lot. After that, 2-3 tooth changes are no big deal since I only use those gears for getting up to speed.
Ideally I guess I would like a 13-14-15-16-17-18-21-24/5. But that's 8 speeds!
Anyway, I got the 2 cogs virtually free and the 15 WILL still be useful, plus I drop the 28, which is too low on the middle ring. Friction shifters! It's just a lot easier to shift down to 1st instead of 2nd when you have to make a quick stop.
Bill Kapaun is offline   Reply With Quote
Old 11-11-07, 02:07 AM   #10
erader
Senior Member
 
erader's Avatar
 
Join Date: Feb 2006
Location: silicon valley
Bikes:
Posts: 1,774
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Bill Kapaun View Post
Your link refers to a 2nd position 13T. IF I used it with the 12T top cog, I'd have to give up a more useful cog elsewhere. I didn't see a 13T 1st position listed.
http://www.nashbar.com/profile.cfm?c...A%20Freewheels
erader is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -6. The time now is 07:30 PM.