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We went with the 37-451 Schwalbe Shredda, which is a reasonable width, similar to the 35x700c on the rear, it is a pain as its not a particularly puncture proof tyre. The main issue we had was the wheel itself, in the end we laced Miche MX40 hubs to Halo's BMX racing rims (which are the only 451 32h rims available in the UK as far as I'm aware) we bought a few spares so if anyone needs any, drop us a message.
Glad to see they are so tried and tested.
Is there finally a reasonably wide tyre for that obsolete wheel size Jumbo insists on using? I have no idea why he doesn't spec them with a 406 wheel and allow the whole range of Schwalbe Marathon tyres to be used.
My Omnium's now done in excess of 25 000km and is still going strong. Good bikes.