Any question answered...

c) How much then?

Less than would bother dammit.

Trackstand, or carry a polo mallet everywhere so you can prop yourself up when at the lights then!

Christ, it's not rocket science.

Fixed.

c) How much then?

Depends which battery chemistry.

c) How much then?

Take a 1.5V cell of 1Ah capacity (e.g. a cheap NiCd C-cell)

Total energy E added to charge from dead to full = 1.5Wh = 5400J

E=mc²

so mass change is E/c² = 5400/3E8² = 5400/9E16 = 6E-14kg

Depends which battery chemistry.

Pretty sure it only depends on the total energy stored in the battery, not the chemistry you use to achieve this, i.e. a 3V 2Ah Lithium cell contains as much extra mass when charged as a 1.5V 4Ah NiCd cell.

6E-14kg

Not a lot then.

Quite a lot, it's equal to billions of protons, and that's proper billions, not titchy American ones.

Pretty sure it only depends on the total energy stored in the battery, not the chemistry you use to achieve this, i.e. a 3V 2Ah Lithium cell contains as much extra mass when charged as a 1.5V 4Ah NiCd cell.

If the cell is a sealed system then I agree the electron weight should be the only difference but if the battery relies on its atmosphere to operate there may be chemical differences between the full and empty states that correspond with captured ions.

I was just considering the mass of the energy, any open cell which exchanges atoms with the atmosphere is going to have a mass change orders of magnitude greater than that. There is no change in the number of electrons in a cell between charged and discharged, they are just distributed differently within the cell.

I'm not aware of any rechargeable chemistries which rely on atmospheric gases for operation, and primary cells which generate by atmospheric oxidisation gain mass as they discharge.

I forgot the question was about weight increase during charging...

Zinc-Air cells are dominant in hearing aids, but are single-use.

Lithium-air are rechargable and should achieve 2-3 times the energy density of sealed Lithium-ion cells. https://en.m.wikipedia.org/wiki/Lithium_air_battery

Looking for 31.8mm diameter bull horns. Would rather flat fro file rather than pursuit style. All the nittos seem to be 26mm and the profiles seem to be drilled for cabling. Any suggestions?

Anyone have an m14 tripple square L key?

Or a bit?

This for Campag BB's? If so, I have the tool.

I may have a 14mm bit somewhere as well- what size does the second gen SiSl take?

For an old Cannondale freehub body.

Something like this would be the best bet I think

Read somewhere that a 12mm allen key will do the job too - not sure I'd trust that on a freehub body though

Quite why they couldn't use an allen pattern in the first place...I'm sure Tester knows.

I'm about to have a look ergostem come into my hands but its missing the expander wedge and bolt.

How east would it be to replace these parts and where would be best to get them?

How east would it be to replace these parts?

I'd go as far as Kharkiv, but then skip a few thousand miles before trying again in Taichung. Basically boycott Russia.

...I'm sure Tester knows.

I'm prepared to hazard a guess. With that bolt, you have to find a way to apply enough torque in the limited space between the axle and the freehub bearing. A simple double-hex hole has been found adequate by Shimano for years now, but they did try a spline first. The disadvantage of a hex is that it has a lot of flank pressure fro a given torque.

Ha, clearly I meant easy.

Any real advice?

See if something from a common cheap stem will fit, otherwise you're probably going to be looking for a machinist, which is going to make the stem expensive.

That's what I thought, I'll try low balling the seller. Cheers MDCC!

For an old Cannondale freehub body.

Something like this would be the best bet I think

Read somewhere that a 12mm allen key will do the job too - not sure I'd trust that on a freehub body though

Quite why they couldn't use an allen pattern in the first place...I'm sure Tester knows.

That is a splined allen key, but there are may types of spline

None of the above. Tripple square apparently.

Looking for 31.8mm diameter bull horns. Would rather flat fro file rather than pursuit style. All the nittos seem to be 26mm and the profiles seem to be drilled for cabling. Any suggestions?

If you like the profiles, use them? Surely the drill holes will be under tape...

I'm looking for an allround packable waterproof and windproof jacket for walking/trekking. It will mainly be used for trekking in Patagonia.

I'd like it to be pretty breathable as I run fairly hot, but obviously I realise that trekking isn't as high intensity as cycling. I'll be wearing a pack so it can't be too fragile, but space is the no.1 concern so I'd sacrifice a bit of durability for packability.

My first choice was this Mountain Equipment Firefox jacket as a friend's BF apparently can get them at a discount. But they're flakey so I'm not holding my breath. Also they have a new one, that looks better but is also £230.

Any other sensible options I should consider?

I'm looking to spend between £100-150 but I'd like to stay as close to £100 as possible.

Also if anyone has been trekking in Patagonia and is okay with me PMing them some questions that would be really helpful.

Cheers.