I have recently converted to a singlespeed from a triple for my 30 mile commute. The total simplicity and pure experience have been my motivator for the change. let alone the cost of repairs to a geared bike after a wet winter.


So I am asking for sugestion about differents bottom bracket and crank setups
Currently the bike came stock with 120mm rear spacing a 68-118mm jis square taper bb and a mountain bike style crank 110 spacing (running off the middle with a chainguard in place of the big ring) After measuring the chain line I think it is 47mm


So I would like to explore different options for the future ... any help is welcome

thanks

you need to shorten your bb spindle length by 5mm to get the proper chainline in order to match any ss/fixed rear hub

Chainline should be 47.5mm with a MTB crank running off the middle ring. But if it's 110BCD, that should be a Road Compact or compact triple, not an MTB crank if it's a Paddy Wagon, 110BCD MTB cranks haven't common since the 90's. MTB cranks are typically 4-bolt 104bcd or 5 bolt 94bcd these days.

Chainline for track or road single/fixed hubs is 42mm (Which is also the chainline on the inside of your typical road double crank with a 43.5 effective chainline in dual-ring configuration). 135mm MTB singlespeed hubs are typically 47.5mm chainline to match MTB cranks.

I have a Paddy Wagon and can confirm that the chainline is 42mm. I measured it myself when I was thinking about replacing the stock RPM 110mm BCD cranks with something else.

You can replace the crank with any standard road double crankset - just use the middle ring to get the right chainline.

I have a Paddy Wagon and can confirm that the chainline is 42mm. I measured it myself when I was thinking about replacing the stock RPM 110mm BCD cranks with something else.

You can replace the crank with any standard road double crankset - just use the middle ring to get the right chainline.

Note, you can replace the crank/BB with any standard road double crank + the appropriate BB for the crank. Different cranks may require different length BB spindles to get the right chainline (unless you're using an external-bearing setup, or an ISIS or Octalink setup with standardized spindle lengths).

Or you can just tear the whole thing apart and do this!

http://forums.mtbr.com/showthread.php?t=295531