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@Regal
I'm quite happy with the two fixed bikes on the whole (and I need a relatively modest bike that I can lock up, which is the Bob Jackson - it also has security bolts and so on), it was more the Time Machine that got me thinking actually. One thing with the Colnago is that in all likelihood neither the bonding nor the alu will last forever - if it cracks or starts to separate I'm already thinking that I could transplant the fork and headset to a custom steel frame with identical geometry (as it really does handle beautifully). But if I could have a single bike that replaced that and also performed winter duties, possibly with discs, that could be something that worked for me.
Re: sizing, I have slight T-rex tendencies so I tend to ride either a trad 58 with a slammed-ish 10cm stem and an inline post (the 'nag & the Bob) or a 56/57 with an 11cm stem and/or a layback. The Osprey is 56.5 top tube with a 10cm stem as I wanted it a little more relaxed. (The Feather is 55.5cm top tube with an 11cm equivalent stem and a layback - the benefits of custom in evidence there.)
You can see how many spacers I've got already on the Osprey - which has a 57cm ctc seat tube and a 159mm headtube. The 58cm Pacer has a fully 58cm top tube and a 154mm headtube with roughly the same seat tube. The 56 Pacer has a 56.5 TT but a weeny 136mm headtube. I could do a 58 Pacer but unless I flipped the stem it would be another 5mm spacers and possibly a shorter stem (dipping under 100mm, ugh). Maybe I should just style out the 58. I should be able to replicate the Colnago's position.