Old GT bike updating to 1×11 Deore. First time doing something like this.
68 mm BB – spacers added… quite a bit of space between crank arm and chain stay.
Haven’t put the chain on yet… any initial thoughts on chain line and spacing between the high gear and drop out?
by BFMGO13
7 Comments
That’s a lot
I’m not the expert here but it looks really far out. I’m in a similar boat and used bolt shims to take the ring more inboard and it improved the shifting a lot. What does it look like without the spacers?
Typically with 1x, the further inboard you can get the better.
Measure from the center of the frame tubing (bottle cage bolts) to the center of the chainring teeth. It should be something like 47-50mm. If it’s more than that you’re going to have to move the chainring closer either by removing crank spacers or adding chainring spacers.
Which crankset and chainrings are you using?
You have the spacers set up correctly. It’s a boost spaced crankset. You can buy new chainring bolts and spacers to get it down to sub 50mm (ideally 47). 5mm spacers should work if you make sure to buy longer chainring bolts.
For what it’s worth I’ve never had an issue moving a spacer over to the non drive side. 12 years shop experience and seen a lot of funky builds.
There are other factors but I normally check crank arm gap to the each chain stay after moving spacers to make sure they aren’t wildly different.