Sur Ron chain length information for various sprocket sizes:

Chains
420 CHAIN WITH 1/2″ PITCH (NO “O” RING) on the standard LightBee (LB)
420 GOLD CHAIN WITH 1/2″ PITCH “O” RING on the LightBee “X” (LBX)
WITH 48T RING YOU HAVE A 106 LINKS CHAIN
104 links 42T
106 links 48T
107 links 48T + pedal kit
108 links 52T
110 links 54T
112 links 58T
114 links for 60T
MASTER LINKS FOR A 420 CHAIN
O’Ring chains will require a O’Ring compatible master link
If you have the pedal kit installed, you need one extra link.
Belt drive model: Contitech HTD 560 8M, 15mm wide

I can verify that the RK 420 chain 110 link, fits the Sur Ron sprocket well. I purchased this chain to use with the Super Moto with pedal kit rather than the chain Luna Cycle provides with the SM kit.  The SM kit does NOT anticipate being used with the pedal kit option. Also the cost of the chain (because it is not an o ring chain) is very inexpensive. I plan to purchase another one to use with a chain breaker if I need additional links for other applications.

My change to an O ring chain

I also opted to change to an O Ring chain to keep chain maintenance to a minimum. I found that the noise of an O ring chain reduces chain noise by about 50% to my ear.

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