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


Go Back   > >

Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

User Tag List

Reply
 
Thread Tools Search this Thread
Old 12-16-08, 09:08 AM   #1
Dhorochokaro
Member
Thread Starter
 
Join Date: May 2006
Bikes:
Posts: 38
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Miche Drivetrain - Chainline

Forgive me if my forum search failed to provide an answer, but I wanted to ask a question regarding the chainline of a sole source manufacturer of components.

Generally speaking, if one were to construct a drivetrain by using a single manufacturer, does that ensure a perfect chainline? For example, I intend to build my drivetrain (120mm rear spacing) with Miche Primato hubs, cog (and adapter), BB and cranks. I understand that my BB is adjustable - this is more about general applicability than about my build specifically. Perhaps there are few manufacturer's that provide all the components for drivetrain construction? I suppose I can only name Campagnolo and Shimano, but I am sure there are more.
Dhorochokaro is offline   Reply With Quote
Old 12-16-08, 09:26 AM   #2
Dhorochokaro
Member
Thread Starter
 
Join Date: May 2006
Bikes:
Posts: 38
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
This, of course, does not account for the bb spindle length.
Dhorochokaro is offline   Reply With Quote
Old 12-16-08, 09:54 AM   #3
Soil_Sampler
A little North of Hell
 
Join Date: Mar 2006
Bikes:
Posts: 4,812
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 20 Post(s)
http://www.sheldonbrown.com/chainline.html
Soil_Sampler is offline   Reply With Quote
Old 12-16-08, 10:24 AM   #4
Dhorochokaro
Member
Thread Starter
 
Join Date: May 2006
Bikes:
Posts: 38
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Forgive me for my ignorance (again), but why does the Miche chainline measurement read 5.85/5.15? And furthermore, how does this translate to my bottom bracket sizing for use with Miche cranks? The calculation suggests a chainline of 41.45-42.15 Sheldon's database of bottom bracket sizes does not include those made by Miche, but I know they come in 107mm and 110mm. Is anyone familiar with the chainline produced when using the Miche Primato cranks and either of these two bottom brackets? The difference is likely negligible as the bb is adjustable?

To make matters worse, my bike already has the new Miche bb installed, but I am not certain what size it is, as my gf took the bike down to the lbs for me (I am far far away from my bike at present).
Dhorochokaro is offline   Reply With Quote
Old 12-16-08, 10:40 AM   #5
MIN 
big ring
 
MIN's Avatar
 
Join Date: Mar 2007
Location: philadelphia
Bikes:
Posts: 5,838
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Miche Primato cranks use ISO 107mm BB for a 42mm chainline. Miche hubs will match this chainline, nominally, but it depends on the cog you use since the offset in cog is not consistant across brands.
MIN is offline   Reply With Quote
Old 12-16-08, 10:45 AM   #6
MIN 
big ring
 
MIN's Avatar
 
Join Date: Mar 2007
Location: philadelphia
Bikes:
Posts: 5,838
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Also:

Miche Primato BB compatability
MIN is offline   Reply With Quote
Old 12-16-08, 10:54 AM   #7
Dhorochokaro
Member
Thread Starter
 
Join Date: May 2006
Bikes:
Posts: 38
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
For the sake of consistency, I will be using the Miche cog. Now, let's assume the installed bb is 110 mm, thus yielding a front chainline of 43.5mm. Is it plausible to use some sort of rear spacer for the 1.5 mm? In this case, I will use the adjustable bb to straighten the chainline, but what if the bb were not adjustable? Do we just figure that the 1.5mm difference is acceptable and pedal on? This inconsistency is the type of thing that eats at my insides - why build a bike with an imperfect chainline?
Dhorochokaro is offline   Reply With Quote
Old 12-16-08, 10:59 AM   #8
Dhorochokaro
Member
Thread Starter
 
Join Date: May 2006
Bikes:
Posts: 38
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
MIN, I meant to thank you for your help.
Dhorochokaro is offline   Reply With Quote
Old 12-16-08, 11:38 AM   #9
MIN 
big ring
 
MIN's Avatar
 
Join Date: Mar 2007
Location: philadelphia
Bikes:
Posts: 5,838
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Dhorochokaro View Post
For the sake of consistency, I will be using the Miche cog. Now, let's assume the installed bb is 110 mm, thus yielding a front chainline of 43.5mm. Is it plausible to use some sort of rear spacer for the 1.5 mm? In this case, I will use the adjustable bb to straighten the chainline, but what if the bb were not adjustable? Do we just figure that the 1.5mm difference is acceptable and pedal on? This inconsistency is the type of thing that eats at my insides - why build a bike with an imperfect chainline?
You can use a BB spacer (available at your LBS or loosescrews.com) to dial in your cog chainline. I have used up to 2mm but beyond that you risk losing thread engagement rendering it unsafe.

Be sure to measure your chainline with vernier calipers prior to using any spacers because the real chainline may not agree with the nominal chainline.
MIN is offline   Reply With Quote
Old 12-16-08, 02:04 PM   #10
erichsia
thread derailleur
 
erichsia's Avatar
 
Join Date: May 2008
Location: beyond Thunderdome
Bikes: 82 Bianchi ECO Pista, Pake, Kilo TT, some *** bmx i found underneath an old house
Posts: 1,095
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Dhorochokaro View Post
Forgive me for my ignorance (again), but why does the Miche chainline measurement read 5.85/5.15?
I think this is in reference to whether you would be using a 1/8" or 3/32" cog. The 5.85 is proabably for the 3/32".
erichsia is offline   Reply With Quote
Old 12-16-08, 02:17 PM   #11
Dhorochokaro
Member
Thread Starter
 
Join Date: May 2006
Bikes:
Posts: 38
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
That makes perfect sense; thanks.
Dhorochokaro is offline   Reply With Quote
Old 12-16-08, 02:30 PM   #12
erichsia
thread derailleur
 
erichsia's Avatar
 
Join Date: May 2008
Location: beyond Thunderdome
Bikes: 82 Bianchi ECO Pista, Pake, Kilo TT, some *** bmx i found underneath an old house
Posts: 1,095
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
FWIW, you don't need to keep everything in the same family, but if you do go with a particular brand of cog on your hubs, it's best to stay with that brand throughout the usage of that hub. But with an adjustable bb like Miche's, you could use various different cogs and have a straight chainline.
erichsia 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 01:09 AM.