Need info on the North Shore Billet 104/64 spider for SRAM carbon cranks

NHAero · #1 02-09-2019, 04:04 PM

Can anyone tell me:
- does the back side of this spider have 4 threaded holes for the 64 BCD ring?
- Does the 104 BCD ring fit on the the front (visible) side of this spider, or on the back side?

Thanks! Can't find a rear side photo of this gizmo or one with just the two chainrings attached with my Google skills, I'm sure they are out there somewhere!

old fat man · #2 02-09-2019, 04:08 PM

Judging by the shaping of those 104 "ears" it seems the ring could go on front or back. Front if running double, back for chainline purposes of running single

NHAero · #3 02-09-2019, 04:18 PM

Guessing that a bash guard could go on the front and the 104 ring on the rear, but still just a guess. Thanks!

Quote:

Originally Posted by old fat man

Judging by the shaping of those 104 "ears" it seems the ring could go on front or back. Front if running double, back for chainline purposes of running single

Mark McM · #4 02-09-2019, 06:56 PM

Quote:

Originally Posted by NHAero

Guessing that a bash guard could go on the front and the 104 ring on the rear, but still just a guess. Thanks!

Yes, the outside face is for mounting a bashguard, and the inside face is for mounting a chainring. The mounting holes for the inner chainring (64mm) are on raised stand offs for chainring spacing, and are threaded for standard 8mm inner chainring bolts.

Because both chainrings mount to the inner faces of the spider, both chainrings can be offset inward with chainring spacers. This allows the chainline to be shifted inboard, while still maintain the same spacing between chainrings.

NHAero · #5 02-09-2019, 07:32 PM

Thanks much!

Quote:

Originally Posted by Mark McM

Yes, the outside face is for mounting a bashguard, and the inside face is for mounting a chainring. The mounting holes for the inner chainring (64mm) are on raised stand offs for chainring spacing, and are threaded for standard 8mm inner chainring bolts.

Because both chainrings mount to the inner faces of the spider, both chainrings can be offset inward with chainring spacers. This allows the chainline to be shifted inboard, while still maintain the same spacing between chainrings.