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 10-17-07, 11:22 PM   #1
WJV 
Senior Member
Thread Starter
 
WJV's Avatar
 
Join Date: Apr 2007
Location: Laramie, Wy
Bikes:
Posts: 180
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Milling a 9 speed crank to 10 speed

I recently acquired a 9 speed Ultegra crank real cheap but would like to run 10 out back. I've searched everywhere and it seems i could probably run as is, but if i wanted to do it right, how much would i mill off the spider for the distance between center of rings to be correct for a Shimano 10 speed? The crank is a double. I guess all i really need to know is the difference in spider thickness between the two? If someone has a set of calipers and a 10 speed crank without any rings on it could you let me know the width? Also i suppose with some creativity and a rotary table i could fix the rings themselves, anyone know the width and pitch of the 10 speed teeth?

Thanks for your time
WJV is offline   Reply With Quote
Old 10-17-07, 11:33 PM   #2
fiver
Senior Member
 
Join Date: Apr 2005
Location: Eugene OR
Bikes: VooDoo Limba, 2000 GF Kai Tai, old lugged fixies
Posts: 130
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The difference is .6mm. Have fun with the lathe
fiver is offline   Reply With Quote
Old 10-17-07, 11:54 PM   #3
Sheldon Brown
Gone, but not forgotten
 
Sheldon Brown's Avatar
 
Join Date: Jul 2002
Location: Newtonville, Massachusetts
Bikes: See: http://sheldonbrown.org/bicycles
Posts: 2,301
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Quote:
Originally Posted by WJV View Post
I recently acquired a 9 speed Ultegra crank real cheap but would like to run 10 out back. I've searched everywhere and it seems i could probably run as is, but if i wanted to do it right, how much would i mill off the spider for the distance between center of rings to be correct for a Shimano 10 speed? The crank is a double. I guess all i really need to know is the difference in spider thickness between the two? If someone has a set of calipers and a 10 speed crank without any rings on it could you let me know the width? Also i suppose with some creativity and a rotary table i could fix the rings themselves, anyone know the width and pitch of the 10 speed teeth?
It will work fine.

Milling the spider would be a Very Bad Idea, the spider thickness is the same for all of them. The difference, such as it is, is in the smaller chainring, which has the teeth offset very slightly to the right.

My very strong advice is to try it as is, before messing with it.

Sheldon "If It Ain't Broke..." Brown
Sheldon Brown is offline   Reply With Quote
Old 10-18-07, 01:19 AM   #4
madman451
tinker
 
madman451's Avatar
 
Join Date: Jul 2007
Location: Minneapolis, Minnesota, USA
Bikes: Schwinn World, MOAB, Varsity; Trek 820, Miyata Five-Twelve rebuild
Posts: 64
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If you want to adjust distances between chainrings, you can use chainring spacers (from LBS) to move the larger chainring to the left.
madman451 is offline   Reply With Quote
Old 10-18-07, 02:35 AM   #5
DannoXYZ 
Senior Member
 
DannoXYZ's Avatar
 
Join Date: Jul 2005
Location: Saratoga, CA
Bikes:
Posts: 11,606
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Quote:
Originally Posted by madman451 View Post
If you want to adjust distances between chainrings, you can use chainring spacers (from LBS) to move the larger chainring to the left.
Huh? How would adding spacers between the spider-arms and the chainring move it to the left???
DannoXYZ is offline   Reply With Quote
Old 10-18-07, 02:56 AM   #6
cs1
Senior Member
 
cs1's Avatar
 
Join Date: Feb 2004
Location: Clev Oh
Bikes: Specialized, Schwinn
Posts: 6,705
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 34 Post(s)
Quote:
Originally Posted by DannoXYZ View Post
Huh? How would adding spacers between the spider-arms and the chainring move it to the left???
He's probably delerious. Seriously, do the Campy trick and mill or scallop out the big chainring at the mounting bolts. Campy did that on all of it's 10 sp cranks to space the chainrings closer. It didn't weaken the chainrings either. Good luck


Tim
cs1 is offline   Reply With Quote
Old 10-18-07, 05:52 AM   #7
capwater
Senior Member
 
capwater's Avatar
 
Join Date: Dec 2004
Location: Quahog, RI
Bikes: Giant TCR Comps, Cdale R5000, Klein Q-Pro, Litespeed Siena, Piasano 105, Redline Conquest Pro, Voodoo Bizango, Fuji Aloha
Posts: 1,509
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Step away from the lathe, mate. Cranks ain't 9 or 10 speed specific. Any attempts to tell you otherwise are pure marketing BS. External bearing cranks work fine on 9 speed and internal bearing (ie; 6500) work fine with 10. The total width of the cassette is the same, thus your chainline will not suffer.
capwater is offline   Reply With Quote
Old 10-18-07, 06:22 AM   #8
damocles1
The mods changed this...
 
damocles1's Avatar
 
Join Date: Oct 2006
Bikes:
Posts: 2,346
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by capwater View Post
Step away from the lathe, mate. Cranks ain't 9 or 10 speed specific. Any attempts to tell you otherwise are pure marketing BS. External bearing cranks work fine on 9 speed and internal bearing (ie; 6500) work fine with 10. The total width of the cassette is the same, thus your chainline will not suffer.
Half true...

The arms aren't specific, but the chainrings are different widths. That being said, 9 speed cranks will work fine with 10 speed and vice versa...
damocles1 is offline   Reply With Quote
Old 10-19-07, 12:40 PM   #9
DMF 
Elitist Troglodyte
 
DMF's Avatar
 
Join Date: Jun 2006
Location: Dallas
Bikes: 03 Raleigh Professional (steel)
Posts: 6,924
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by WJV View Post
I recently acquired a 9 speed Ultegra crank real cheap but would like to run 10 out back.
So? Do it. No need to cut anything.

Quote:
Originally Posted by WJV View Post
anyone know the width and pitch of the 10 speed teeth?
Ah! Now the confusion becomes clear. There is no difference between the teeth, because the inner bits of the chain are the same between 9- and 10-speed chains. It's the outer width that has changed. The chainring spacing - measured at the teeth - is also the same.

I gather you thought you needed to run 10-speed chainrings on the 9-speed spider. Totally unnecessary. Besides, the rings are different widths (reportedly) so don't interchange.

Don't make this stuff harder than it is.
__________________
Stupidity got us into this mess - why can't it get us out?

- Will Rogers
DMF is offline   Reply With Quote
Old 10-19-07, 09:04 PM   #10
nitropowered
Senior Member
 
Join Date: Dec 2004
Location: Athens, Ohio
Bikes: Custom Custom Custom
Posts: 5,104
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I've run a 9speed Dura Ace crank on a 10 speed shimano and 10 speed campy set up with no problems.
nitropowered is offline   Reply With Quote
Old 10-19-07, 10:08 PM   #11
ultraman6970
Senior Member
 
Join Date: Dec 2005
Bikes:
Posts: 7,860
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Im a campy person but i really dont understand why u have to mill the crancks to make them work with a 10 sp set. Get 10 sp chainrings, those are thinner i believe, as somebody said probably even it will work fine as it is. What u should be worry about is about the 10sp cassette not of the cranks, cranks are pretty much standar in distances and as long as the chain fits fine u are ok. I have seen guys running any cranks with campy, even shimano 10 sp cranksets with campy 10. I believe all should work fine dude.

Good luck.
ultraman6970 is offline   Reply With Quote
Old 10-20-07, 06:55 AM   #12
jemoryl
Senior Member
 
Join Date: Sep 2004
Location: New Jersey, USA
Bikes:
Posts: 1,007
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If there is a difference it is probably not enough so that you can notice it in actual use. The manufacturers want to sell new things and need to sow insecurity in the mind of those who have a '9-speed' crank that maybe they need a new '10-speed' crank when they upgrade.
jemoryl 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 11:33 PM.