Niner MCR 9 RDO 1x Spacer: Keep the Upper Shock Mount Complete
A Niner MCR 9 RDO 1x spacer is easy to mistake for an optional finishing piece. On the documented frame, the front-derailleur bracket shares the upper shock bolt. Niner allows a tidier single-chainring arrangement by replacing that bracket with a specified spacer; simply removing the bracket leaves the manufacturer’s required assembly incomplete.
Locate the Niner MCR 9 RDO 1x spacer requirement
Niner’s dedicated one-page setup note describes a braze-on front-derailleur mount retained by the upper shock bolt. Its photographs show the bracket beneath the bolt head and, separately, the small replacement spacer. This identifies the exact location at issue; it is not an instruction concerning a bottom-bracket spacer or cassette washer.
For the documented single-chainring build, the note says the frame’s small-parts bag includes a 3 mm spacer. The bracket can be removed and replaced with that spacer. Its central requirement is that either the front-derailleur bracket or the 3 mm spacer remains beneath the upper shock bolt head.
Separate drivetrain choice from the shock attachment
A 1x drivetrain removes the need for a front derailleur. It does not remove the need to assemble the shock attachment as specified. That distinction matters when a used frameset arrives with a bag of loose pieces or a previous owner has already removed the bracket.
Keep the identified mount and spacer with the frame records. Tell the workshop which arrangement is present and whether any original pieces are missing. A similar-looking washer does not acquire the specified part’s suitability merely because its advertised thickness is 3 mm.
Arrange the complete conversion
Have the mechanic confirm the actual frame and upper mounting assembly before loosening suspension hardware. The short note does not provide a complete suspension service procedure, a substitute-bolt specification or an instruction to stack the bracket and spacer together.
The drivetrain itself still needs an appropriate crank, chainring, rear shifting system and chain arrangement. This bracket note resolves one particular frame detail. It cannot approve every collection of single-chainring components or establish that an owner bicycle has been converted correctly.
FAQ
Can the bracket position be left empty on a 1x build?
No. Niner requires either the front-derailleur bracket or the specified 3 mm spacer beneath this bolt head.
Is the spacer shown a bottom-bracket adjustment?
No. The dedicated note places it at the upper shock bolt where the removable bracket was retained.
Does the document supply the whole conversion procedure?
No. It addresses the bracket and spacer arrangement; the actual suspension attachment and drivetrain need their applicable instructions.
For this conversion, account for the small mounting piece before treating the missing front derailleur as a finished job. The Niner topic and brand introduction provide the wider bicycle context.
Primary references: official reference 1 (https://www.ninerbikes.com/media/productattach/m/c/mcr_9_rdo_-_fd_mount_1x_setup.pdf)
Photograph credits and permissions
Photograph 1
Original title: Niner RLT 9 RDO in the desert
Creator: Inklein; creator URI: https://commons.wikimedia.org/wiki/User:Inklein
Original source URI: https://commons.wikimedia.org/wiki/File:Niner_RLT_9_RDO_in_the_desert.jpg
License / permission: CC BY-SA 4.0
License / permission URI: https://creativecommons.org/licenses/by-sa/4.0/
Modification notice: Original JPEG bytes unchanged.