I have a new crankset (link) on the way as well as a chain guide/bash combo from OneUp. I am getting a 36T narrow-wide chainring also.

The bike I'm working on has a SRAM 3x9 drivetrain with 11-34 cassette. What else, if anything, do I need to convert it to 1x9 (other than putting the new crankset on and removing the unnecessary front der & shifter)?

Is it correct that Shimano 11sp cassettes fit on 8/9/10sp freehub, so I could in theory change it to a 10sp or 11sp cassette? I'm not planning on doing that ATM but just in case...

up vote 2 down vote accepted

General consensus is that a 'clutched' rear derailleur is also a key component to a good/successful 1x setup. These derailleurs provide a tighter 'pull' on the chain and help keep it from hopping off the chainring on rough terrain.

For cassette/freehub compatibility, read the discussion that occurred here: https://bicycles.stackexchange.com/a/28908/30533 ...

Shimano/SRAM 11 speed cassettes are wider than 8/9/10 speed ones. So yes, you need a new, wider freehub body, unless your old one was not very old and used a spacer to fit a 10-speed cassette.

  • OK, so to clarify I could use a 1x10 on the current freehub, but I might need a different freehub if I ever wanted to go 1x11 (I don't intend to). Also, is clutched derailleur necessary if running a narrow-wide chainring and a chain guide? I've seen some discussions about that and from what I've read, seems unnecessary in that case. – David Zemens Jul 5 '17 at 19:47
  • Yes - you would need a different freehub body for an 11 speed cassette. I suppose it's a matter of preference, how much 'protection' a given rider wants against chain issues. Your chain guide will probably alleviate 99% of issues. A clutched derailleur might help prevent the (remote) possibility of your chain slapping off of the lower part of your chainring, just before you ratchet/back-pedal on a descent (unlikely, but not impossible). – Matt Goodman Jul 6 '17 at 17:42
  • As SRAM has better/stronger tension than shimano, it is not neccessary to get a clutch mech. BTW Sram does not have any clutch mech. I am using saint 9 speed without any clutch, what I did I just cut short the chain and installed a cheap lower guide to prevent the slap on my chain ring. – thompsonrapier Jul 7 '17 at 2:54

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