10 years coal mining, 25 years teaching, 10 years Head of Faculty, now retired...
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Some assumptions needed regarding air temperature in the tire - say 50C (273+50=323K) for example - and that the internal volume of the tire remains constant.
likely pressure when hot = 140x323/293 = 154psi
starting pressure to give 140psi when hot = 140x293/323 = 127psi
The flaw in the argument is an assumed temperature - the real answer would be to check the actual pressure this afternoon. An even bigger problem is I've just noticed the time - you're probably not going to see this until you get back, in which case you'll know the answer...
I'm pretty sure the ratios are 4:3, 1:1, 3:4 giving uneven steps between gears (epicyclic gear box).
It might be worth checking the maths - 46/19 should give 87 65 and 49GI which could be quite usable, depending on the full implications of "a girl who isn't a very good cyclist".
I'm finding 91 69 and 51GI about right (55 yr old / 85 kg male on the Clee Hills) but given how cheap and easy it is to change the sprocket (search YouTube, disconnect cable, remove wheel, remove spring clip, take old sprocket off, place new sprocket on, replace spring clip, replace wheel, reconnect cable, adjust cable) I'd be tempted to leave the front end and tinker with sprocket sizes until your girl is comfortable and approves - there's little point in gearing you think is correct if it doesn't get used (voice of experience - Mrs. E and myself disagree significantly over ratios and correct use of gears)
Lighter fuel? - may be a bit less 'assertive' than meths and perhaps less likely to take the paint off.
"Look more ratty" or actually be more ratty?
The patina that comes with use takes time, wear, and probably an oily rag.
sprayonrustpaint.co.uk/ if you're in a hurry...
Many years ago- in the last century even - I sent my technician to scrounge a couple of shopping baskets as part of an' A' level product design exam - every school offering the exam needed at least two, but couldn't tell anyone why. Needless to say it was difficult, and the main reason for the local shops not co-operating was the cost of a shopping basket. I gained two important bits of information: AQA Product Design was run by idiots, and shopping baskets cost over £25 each in the late 90s.
tl;dr yes they're expensive.
Moped / autocycle panniers are suitably cavernous and weight is not an issue: I carry a small bottle of sanitizing hand gel as part of the tool kit - used frequently for hand cleaning after roadside 'maintenance' and theoretically* might act as an alternative lubricant. Drum brakes front and rear means I shouldn't have to worry about lubricating the braking surfaces.
*one of my many unproven theories - as yet untested given to the lack of punctures so far, and if I'm wrong my insurance includes recovering the bike to home...
Read this yesterday with interest. My difficulties are with 2-19 moped tyres on 60 year old chromed steel rims - clearly different to TB14s, but much the same problem of a 'tight' tyre.
Entertained myself for a few hours yesterday evening, comprehensively failing to fit a tyre, even after following all the advice I could find.
Decided the biggest problem was getting the tyre to move in and out of the 'well' in the middle of the rim.
Lubricated with diluted washing up liquid this morning - went on easily with a pair of plastic tyre levers...
Screwed the battens to the wall - packed with wedges / scrap to give vertical - marked a constant distance from the wall to give a guideline - remove screws and cut to line.
Similar problem at a previous house: I resorted to battens shaped on one side to the profile of the wall using a spoke shave - doubtless there is a more modern power tool that will do the job, but shavings are much easier to clear up than dust. Said battens varied from 1/4" to 1. 1/4" thick, and allowed a ply panel to be fitted true, or at least as close enough, screwing through the ply and batten into the wall.
The biggest problem I found was drilling into Victorian brick - carbide masonry drills were good for no more than two holes...