Any question answered...

Sargent & Co in Finsbury Park?
Seen they have reopened recently.

Paging @mdcc_tester...
Is having 20cm of Ti Seatpost inside an Al frame asking for trouble? Tips for surface prep? Not many of these were made so cutting down seems like a shit thing to do.

Clever Mike on Hornsey Road has some nice secondhand bits hanging up in the shop.

Is having 20cm of Ti Seatpost inside an Al frame asking for trouble? Tips for surface prep?

The length isn't a problem per se, although it could become one if the two become one since the bond area will be large. Titanium is pretty bad news for your aluminium frame, but at least it will save itself while it kills your frame, so that's a plus if you like the post. If you must, assemble with Copaslip and keep it bone dry. Dismantle and recoat if you ever use the bike on a day when it is raining, has rained or looks like it might rain.

By far the best thing to do with titanium seat posts, and indeed most other titanium bike parts, is to find a greater fool to take them off your hands and use half the proceeds to buy aluminium or steel and the other half to buy a beer to celebrate dodging a bullet.

Should've been asking before buying it seems, no merit to it other than the way it looks. Thanks for the sound advice, I suppose I'll have to squeeze in the upkeep somewhere inbetween my speedplay maintenance/chain waxing routine.
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no merit to it other than the way it looks

FTFY. At least my Ti seatpost actually looks nice and exploits the properties of the material🙂

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Are you less than 85kg though? ;)

Cheers, I'll see which of those is easier to pick up online when I next do a shop.

Are you less than 85kg

Not by a long chalk, but mine is the road version with only 150mm poking out of the frame, about half the cantilever length of the MTB ones made from the same tube stock.

Surely the limit was meant for the clamp . I'll give you a sp-248 and a beer for it.
It doesn't really match my credenza, but we can't have you riding a death trap.

Surely the limit was meant for the clamp

Dunno. That's going to depend on how you sit on it, and I tend to sit right over the clamp so it doesn't try to rotate. Whatever, it's given no trouble these 25 years, and I promised somebody I'd actually ride the bike this year if his open 10 actually runs, so I'm not going to start messing with new stuff now.

Between the Dean post, Cinelli Grammo and CQP Ti cranks with Ti BB axle, I have about £900 invested in the so-called wonder metal, but I'm still not going to pretend any of it is a good idea 🙂

It doesn't really match my credenza

It probably won't fit it either, given that it's the rare 27.0mm size to fit my 753 frame

Did you see that ludicrous display last night?

What was Wenger thinking sending Walcott on that early?

It is interesting to note that that line, first shown in Nov 2008, was actually relevant for about 12 years: 2006–2018.

Is this also an issue with a ti post in a steel frame?

It's my brother's birthday coming up. One idea I had for a gift was some sort of cocktail making class. Any suggestions for something like that in south London? He's Brixton based.

Is this also an issue with a ti post in a steel frame?

Yes, but much less so. It still corrodes the frame in preference to the seat post, but the potential difference in the galvanic cell is lower.

I don't understand what all of that means but I'm taking it as a go ahead to slather my new, posh looking USE Sumo post in copper grease and slide it on in to my All City Mr Pink and hope for the best.

I had to wade across a pond in these and now they smell like a swamp monster’s gusset. Can I wash them in the machine? Worried about the screw holes, the gore-tex water proofing and the puma disc thing, will they all get ruined?

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Wash by hand, leave to dry and possibly try baking soda...

hope for the best

Don't just hope, do the maintenance. If you're riding in all weathers, pull the post once a year (ideally just before they start salting the roads) and regrease.

If you only pull the post once a year, you're a man of stronger convictions than I.

Thanks for the advice, I'll make sure to keep on top of it!

Well, lockdown can get to a person...

Where's the best place to ask about frame, BB, crank compatability?