Zee crankset

[Joejoebeans]

I'm fitting a Zee crankset to the Yeti. When I put it on with 1 spacer on the non-drive side and a spacer plus ISCG tab on the drive side, the crank bolt wasn't reaching the axle. Did some research and realised that you only need to have one spacer for 73mm so I removed one from each side and left the ISCG tab. With this setup, it's sitting too close to the ISCG tab to reattach the chain guide and both of the cranks are sitting flush to the BB bearings. The axle reaches to almost exactly the end of the non drive side crank.

I measured the BB width of the frame and it seems to be a little shy of 73mm (71.5 or so) which I didn't think was an existing standard. Is the 73mm supposed to include the ISCG tab? The crankset that came out of it was a Truvativ Hussafelt which I've measured to be 73mm. This had a spacer on each side along with the ISCG tab.

So does anyone have any suggestions as to what's going wrong here? And would it be OK to just stick another spacer in

[nathybren]

Check to make sure the frame side of the ISCG mount doesn't have like a little indent to accomodate a spacer.
As far as I was aware, the spacer always went on the drive side.
I am not experienced in these matters however and without a visual, I am of very little use.

[Psycholist]

Sounds like whoever faced the BB went to town on it and took over a mm off. For a BB mounted chain guide no spacer is needed on the drive side and none are needed on the non drive side for a 73 mm BB. If you can find a thinner spacer than the 2.5 mm standard one and stick that in you will hopefully be able to get the effective BB length to 73 mm again, but sticking a 2.5 mm spacer in will probably get the assembly to a safe arrangement as you only lose 1 mm on spline engagement on the non drive side crank (If the BB is 71.5 and the chain guide plate is 2.5 mm. Do you remember what way things were assembled on the previous cranks?

[Joejoebeans]

Check to make sure the frame side of the ISCG mount doesn't have like a little indent to accomodate a spacer.
As far as I was aware, the spacer always went on the drive side.
I am not experienced in these matters however and without a visual, I am of very little use.

No indent on the ISCG mount. AFAIK, the mount is designed to replace a spacer. Spacer is supposed to go on alright

Sounds like whoever faced the BB went to town on it and took over a mm off. For a BB mounted chain guide no spacer is needed on the drive side and none are needed on the non drive side for a 73 mm BB. If you can find a thinner spacer than the 2.5 mm standard one and stick that in you will hopefully be able to get the effective BB length to 73 mm again, but sticking a 2.5 mm spacer in will probably get the assembly to a safe arrangement as you only lose 1 mm on spline engagement on the non drive side crank (If the BB is 71.5 and the chain guide plate is 2.5 mm. Do you remember what way things were assembled on the previous cranks?

The old arrangement was either (from left to right):

crank, spacer, BB, ISCG mount, spacer, chainring or
crank, spacer, BB, Spacer, ISCG mount, chainring

Pretty sure it was the first one. I've tried setting it up with the ISCG mount and spacer on the drive side (to push the chainring further from the ISCG mount) but it's still too close to the mount for the chain guide. Is it possible Zee cranksets don't fit some chainguides?

[nathybren]

Is it possible Zee cranksets don't fit some chainguides?

I'd be very surprised. It's a DH crankset for feck sake.
Cormac, if the facing was too enthusiastic, could you get a chunk of large guage pipe and use a cutter to make a spacer?
Though that may be a little tricky. Might be easier to sand down a spacer.

[Joejoebeans]

Is it possible Zee cranksets don't fit some chainguides?

I'd be very surprised. It's a DH crankset for feck sake.
Cormac, if the facing was too enthusiastic, could you get a chunk of large guage pipe and use a cutter to make a spacer?
Though that may be a little tricky. Might be easier to sand down a spacer.

I reckon I'm happy enough to run it with the 2.5mm spacer + ISCG mount. It means there's a tiny length of splines that don't overlap. I suppose what I'm trying to figure out now is why in the hell the chain guide doesn't fit. Should the chain guide plate be mounted on the inside of the mount? It was on the outside of it before

[Joejoebeans]

Just watched a video on fitting a chain guide. Looks like the mount was on backwards on mine so I'll test that when I get home. Cheers for the advice so far

[Psycholist]

There shouldn't be any spacers between the cranks and the BB bearings if it's a stock Shimano setup. All the spacing is done between the BB cups and the frame.

[Joejoebeans]

There shouldn't be any spacers between the cranks and the BB bearings if it's a stock Shimano setup. All the spacing is done between the BB cups and the frame.

Derp... Those should have read

crank, spacer, BB cup, frame, ISCG mount, spacer, BB cup, chainring/crank or
crank, spacer, BB cup, frame, Spacer, ISCG mount, BB cup, chainring/crank

[nathybren]

There shouldn't be any spacers between the cranks and the BB bearings if it's a stock Shimano setup. All the spacing is done between the BB cups and the frame.

Derp... Those should have read

crank, spacer, BB cup, frame, ISCG mount, spacer, BB cup, chainring/crank or
crank, spacer, BB cup, frame, Spacer, ISCG mount, BB cup, chainring/crank

[Joejoebeans]

So I took the plate off the ISCG mount, turned the mount around and put the whole assembly back together