[GTBecane]

So, went from the junk on the floor, to the Box stuff. I put the BB spacers where they are at the recommendation of an article (63 mm BB housing). Everything works as it should but the chain line seems a bit wonky and chatters a bit. I’m going to take one spacer out on the drive side and move it to the NDS. My question is, if needed can I put all three spacers on the NDS?
The spacers are needed for the crank to fit correctly.
Thanks!

 

[GTBecane]

View attachment 2027482
View attachment 2027483
View attachment 2027481 So, went from the junk on the floor, to the Box stuff. I put the BB spacers where they are at the recommendation of an article (63 mm BB housing). Everything works as it should but the chain line seems a bit wonky and chatters a bit. I’m going to take one spacer out on the drive side and move it to the NDS. My question is, if needed can I put all three spacers on the NDS?
The spacers are needed for the crank to fit correctly.
Thanks!

sorry, correction, 68mmBB housing.

 

[cassieno]

Did you measure to verify 68? Just watch the crank arm clearance to frame and you should be fine putting them where ever.

When you say chattered what do you mean? How do you know it's crank and not derailleur?

 

[GTBecane]

Yup measured when I put it together (while it was stripped).
Almost like a fine toothed ratchet when in the biggest cog, (in sound, not really feel). It appears to me like it’s the chain rubbing on the side of chain ring.

it’s a Deore 6120 crank set.

 

[forward]

Deore 6120 crankset has 55mm chainline. Does your frame have 135mm rear hub spacing? Then crankset should have around 49-50mm chainline. 52mm max. 55mm works only with boost spaced frames.

 

[GTBecane]

Ahh, **** that explains some things, any way to rectify? Or any cranksets you can recommend? I was working off the recommendation from the folks at box when I chose that crank.

 

[849097]

View attachment 2027482
View attachment 2027483
View attachment 2027481 So, went from the junk on the floor, to the Box stuff. I put the BB spacers where they are at the recommendation of an article (63 mm BB housing). Everything works as it should but the chain line seems a bit wonky and chatters a bit. I’m going to take one spacer out on the drive side and move it to the NDS. My question is, if needed can I put all three spacers on the NDS?
The spacers are needed for the crank to fit correctly.
Thanks!

This exact trouble came my way yesterday assembling a beater/rain bike. It is not great stacking all three spacers on the non drive side because the left side BB often has fewer threads. It is optimal in a 72mm BB or the exo BB bearing is left barely hanging on. These dedicated 1x cranks have limited chain line adjustment. I end up looking for 3x cranks to use the middle position with a bash ring outer. And a spider allows for chain ring spacers. 2x to 1x crank is even worse than 1x only. I want to bias to the big cog that gets the most torque and time spent cranking than high gear, what you are seeing. A short chainstay makes it even harder to get right because of the more acute angles. For your crank, does it support an offset chainring?

 

[GTBecane]

Ok, figured out a crankset that’ll work, Shimano Zee FC-M640 (50 mm chain line). So will return the Deore and install the Zee.
Thanks for the input and help!

 

[849097]

Ok, figured out a crankset that’ll work, Shimano Zee FC-M640 (50 mm chain line). So will return the Deore and install the Zee.
Thanks for the input and help!

Glad you worked it out. Here is my solution. For the rain bike I tried a Samox crank, but it was designed for 73mm BB. I needed three spacers, 6mm, all on the left side which left the shell hanging by a thread so to speak. The Samox has a one use steel ring that can't be spaced and I bias chain line to first gear.
This is a 2x Deore FC-617 104 bcd. These Hollowtech II are some of the best cranks ever. But yeah, 2x. I was able to remove a spacer from the left side and add 1.5mm chainring spacers behind the 34T Snail narrow wide. I left the steel 24T spaced over by 3mm. Because, why not? Chain line to the 1x ring is 46.8mm. The Koozer cassette carrier is made far to the right. I measured 49.1mm to the center of the 9 speed cassette. This arrangement is all kinds of fun with good high end. A stick shift to low gear and the 14 gear inches helped me scale stupid steep trail.

 

[GTBecane]

That must be the space that the Zee took up in shimano line up, they have the same measurement 2x I believe

 

[GTBecane]

All better!