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@Dammit
I've been zooming around on my Langster, with a zero setback post and the saddle clamped in the middle of the rails.
This, along with the 0 rise stem that is on the headset top cap gives quite a "forward" position, and feels like I can make good power easily.
I set a bunch of PR's round Regents Park on this bike last week- beating times I'd set on the geared road bike.
So it feels fast, and seems to be fast.
Of course, I've done a bit more training since I last took the road bike round Regents Park, so that data might be misleading.
Anyway, rode into work this morning on the cross bike, much lazier angles, layback post, much further back from the pedals and it felt slow as anything- like I could not develop much power at all.
This time I had a power meter, and I was producing ~280 watts, but it felt harder than that should feel, if that makes sense?
Anyway, if I push the saddle forward on the crosser to match the Langster then I'll shorten the effective top tube by quite a bit- just under 3cm I think.
This sounds less than ideal- I last ran a 150mm stem in the min-nineties.
Am I likely just over-estimating the saddle position thing here, where the actual culprit is going from 22mm tubs to 35mm cross tyres?