Chain line questions

[MIGZ]

I'm going to need some help here.

I'm in the process of using an euro bottom bracket adapter in a workman frame. The issue I am having is trying to figure out what bottom bracket I need to make sure my chain line works. I will be using a nexus 3speed rear but have no clue what to do up front.

Any help would be greatly appreciated.

 

[Slick Rick]

I'm not too sure what your worries are. Seems as though your chainline will remain the same, and a Nexus 3-i lines up about the same as a coaster hub, ifso-facto, no worries! :mrgreen: Am I missing something here?

 

[user 135]

Chain lines matter. But generally single speeds/Nexus 3 line well enough. Depending on the crank you use, it can be adjusted to the inside or outside of the spider on the crank arm.

 

[MIGZ]

my challenge is that I'm going from and American 1 piece bottom bracket to a euro 3 piece bottom bracket. Euro bottom bracket come in several widths to allow for proper chain line in one a multi geared bike. I just don't know what size i will need to make sure i line up with the rear hub.

 

[Slick Rick]

OK, Gotcha. If it were me, I would probably start with some measurements. If you dont have a caliper, Harbor Freight sells a 6" digital caliper that does metric and standard for right at $10.00. Pretty handy item and pretty hard to beat at that price. Mock it up first w/a 1 pc. crank set up and measure the span, use metric as your euro type bottom bracket will be measured this way. Go from there! :wink:

 

[jerrykr]

I've had 2 Nexus 3 speeds on American BB and they line up just fine. I had to spread the drop outs on one frame slightly. If you could measure an American BB that might tell you which European to buy. You will like the 3 speed!

 

[XC204]

Had to adjust the line on my last build the hub was an Inter 4 Shimano the cog is dished and I just removed it and flipped it. Got about 1/4" towards the wheel.