Any question answered...

Eat more off the bike. Carry it with you in MASSIVE BELLY.
That's my plan.

Dem recipes tho!

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I have both (feed zone "portables" and "cookbook"), veggie recipes are your typical 20% veggie, 80% omnivore like you see on restaurant menus. Most recipes can be "veggified" though.

If you're looking for bike friendly snacks I would highly recommend the portables one, the cookbook one is just a recipe book for fast sit down 15 min meals (if you already know how to make a stirfry with left over ingredients in the fridge, you won't need it). The essays are very interesting in both books.

Seconded from @bothwell , once you get the hang of the basic "frame" for each type of portable you can get creative with your own fillings, it's very flexible.

tl;dr: buy the portables one if you need bike snacks, borrow the cookbook to see what's in there and read the essays.

Funnily enough, I think that Tarmac frame is OSBB, which is specie's BB30, so it probably has a converter to BSA in it, meaning if you took the whole lot out, converter and all, it would go in a BB30 SystemSix @mk1mark

Taking the converter out might not be a good idea tho :)

IIRC some SystemSix - the later ones - were not BB30, so it all depends.

latex inner tubes - how much pressure do they lose over say an hour, 10 hours, etc?

About 10psi over 24hrs in my experience. Assuming inflation of around 100psi initially.

that's not too bad then.

More i'd say

For Roubaix they put about 10psi more than required for the first cobbles - by the time they reach em the tyres are running at the correct pressure

Or so I read. Somewhere.

I read about one particular Roubaix specific tyre losing so much air that by the last cobbles they would be 40ish psi lower as the shock absorption was more important at that point than rolling resistance.

More i'd say

Depends which latex tubes, the Vittoria ones seem to hold up better than the Michelins.

Are glass balls appropriate media to use for blasting an 853 frame? (With a rather thin walled OS aero downtube)

Plastic might take a little longer/cost more but why risk it?

One of my mates is stripping an 853 frame and the guy at his work only seems to have glass as an option.... I suggested walnut shells or soda but these aren't on the cards (as yet)

Glass beads aren't too harsh but not great for paint removal, I've had aluminium scooter parts done and it leaves a 'peened' finish. They're often used in conjunction with water for getting bits vapour blasted.
As long as the guy doing it has some common sense and doesn't go crazy with the pressure...!
Does anyone ever get stuffed acid dipped in the bicycle world?

aw shit really? I went for the Michelins because they were a bit cheaper.

I have had better experience with the Michelin ones rather than the Vittoria - the Vittoria ones both punctured pretty quickly whereas the Michelin seemed to fair better.

Yeah, I've had much more success with Michelin than Vittoria. Got Challenge on my road bike at the moment, seem to be ok.

Michelin seemed to fare better.

ftfy.

I've had a lot of Michelins fail at the join or the valve, but if they survive the first week they seem to last OK.

Trashed Ritchey IS headset in a Scott CR1: what's this two-piece crown race all about?

I was going to suggest a Cane Creek 40 as a replacement: do I need to remove both parts?

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It's the crown race race

The press-fitted chamfered bit is the bearing seat, you can probably leave that if you're replacing the lower bearing cartridge with another one with the same chamfer angle. The loose bit with the ball track is the inner race of the lower bearing, there's usually some kind of circlip to stop it from separating from the outer race which sits in the head tube or lower cup.

It has caged bearings (top of HS on left, bottom on right).

So the first one is a seat for a cartridge and the second is a race for "open" bearings?

Is that just for ease of production, ie assemble just one fork/race and add the race for cheaper models using caged bearings?

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Yeah, iirc there was a bad batch of the Michelin tubes that hadn't had the valves properly attached, the ones I have had recently all have been fine.

Is that just for ease of production, ie assemble just one fork/race and add the race for cheaper models using caged bearings?

Looks like it. I've seen some cheap headsets that are put together like that.