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Hi, yeah I shouldn't have put that in the title because it's a bit misleading, have changed it now. The frame was custom made, not sure why 30mm was chosen but it caused me hassle trying to get a seat post clamp. The double mech that is currently fitted is a 28.6/31.8mm so I think it must have some shims in there. If you could send me some pictures or more details that would be great! Thanks!
ferriswheeler
That 30mm diameter must be a bit of an odd size for a seat tube? I have a couple of triple front mechs but they have the larger 31.7mm clamp. I think you'll do well to find the 30 one- maybe these are more mtb specific, although you did say your bike was a tourer. If not, then I guess the larger size and a shim would do the job.