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Do stages do omnomnoms? You have to buy Omnia, then buy a non-matching Stages GXP left crank, and he also needs a chainring since the SRAM track one is nowhere near big enough for the gearing he uses (well, he could go 48/12, but who wants to use a 12T sprocket for TTs?) Plus that's the Rival OCT crank, so he gets better cranks for less by using the hollow road cranks rather than the solid track ones, and Fibrelyte are usually good value (I think he mentioned not much over £100 for the chainring and the adapter) so it's quite likely that there's little or no premium for using Rival, given that Omniums are typically at least £50 more than Rivals.
Pretty sure it's Cliff Voller's bike, but with any luck he's upgrading to a T3 soon. I think the adapter is actually 130 to 144, but the main reason for it is to fix the chainline rather than the pcd.