You are reading a single comment by @Multi_Grooves and its replies.
Click here to read the full conversation.
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
@Multi_Grooves
Think I've got it:
109.5mm DA bb gives 42mm chain line (octalink)
I need 45mm. That's an additional 3mm chainline (x2 for symmetry) + 109.5mm = 115.6mm bb in an ideal world.
The options in bb lengths are: 113mm and 118mm:
option 1
113 - 109.5 = 3.5mm /2 = 1.75mm addition to the 42mm chainline = 43.75mm
-1.25mm too short.
option 2
118 - 109.5 = 8.5mm /2 = 4.25mm addition to the 42mm chainline = 46.25
+1.25 too long.
I guess the latter option is better as I can use spacers for the level bolt-on sproket. Unless I've missed something?
http://www.levelcomponents.com/images/Level%20concept.jpg