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They're the same cogs according to their site:
"Andel (S*rly) Cro-Mo Singlespeed Cog
As with the Andel track cogs these are identical in manufacture to S*RLY singlespeed cogs but do not have 'S*rly' engraved and you don't get a brown header card. The same superb quality machining in heat-treated cro-mo with a wide base of 4.35mm for full support on the freehub body, especially when used with aluminium freehubs. This specific width allows these to be combined and used with 9 speed shifters too for custom set-ups (ie 2, 3, 4 speed etc).
Use with a road or mountain bike if running a splined Shimano pattern cassette hub as a singlespeed with our kits above or similar. Ideal for the 'free' side of a mountain bike fixed/free 'flip/flop' hub. Please see FAQ for set-up advice and converting to singlespeed.
Width is 3/32" so usable with any 3/32" (8 or 9 speed) or 1/8" chain. Full height teeth with no ramps and beautiful polished chrome finish. Available in sizes 14t to 21t. Latest stock does not have Andel engraved. Please see FAQ for set-up advice and converting to singlespeed."
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hippy
velo solo cogs are quite narrow based i think as
the surly ones have a very big foot print which will damage the free hub less