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With many, but far from all, cranksets you change change individual chainrings, keeping your triple. Fitting a bigger one to replace the 48, the front derailleur will have to move up a little. So to …

On road, gears much less than 1:1 aren't really quicker than walking anyway. 4.8km/h is a realistic walking pace pushing a bike uphill. … My friends who have just got back from Paris-Brest-Paris (1200km in 90 hours) have similar gearing, down to 30:34 in the lowest case I know of - and a few were on fixed gears. …

From having maintained cheap bikes using other bikes as parts donors, even dismantling some to provide parts for others you're likely to need to buy some bits like chains and cables. They're cheap but …

I've used a laboratory ultrasonic bath for bike parts. That's designed specifically for use with only plain water directly in the bath, and I wouldn't want to contaminate it anyway. Any solvents or o …

The stall I've felt going uphill was when my foot couldn't get over top dead centre before I ran out of momentum. That really is a minimum speed for the circumstances, but depends on the gear. This is …

Also mark the adjuster to be sure it's not self-misaligning (the ones on my downtube creep, until I can't access my lowest gears) …

This is only a suspicion, but: something I've seen before, when re-cabling such shifters, is that the cyclindrical end stop on the cable isn't seated properly in the correct position, and jams the rot …

If you've got twisted links, they're likely to snag on the derailleur or gears, possibly only under load. If you try to straighten them, they'll probably end up stiff, and will be weaker. …

One issue is that it can be harder to balance a bike while spinning like crazy than while pedalling more sedately. Timing a gap in traffic, for example, I can get below 1km/h, but changing right down …

This means that if you really want gears, the chain that drives the rear cassette or hub gears must move forwards. Fixed gears are designed to be driven backwards for braking. … Your point about intermediate gears is easily dealt with by making both gears on any intermediate axle the same size. …

Small gaps allow you to pedal at a suitable rate for your legs and the speed you're doing. After breaking a rear gear cable, I did 70+km on a wide-ratio 3-speed recently. It was quite hard (but I wa …

You've got 8 gears in the back so I assume you've got indexed shifting. If you're using friction shifters it's not an issue as you can overshift then back it off. Further reading from Sheldon Brown …

A friend of mine has snapped several chains on the same hill and now walks it, because he's very strong and fairly heavy and doesn't have the low gears to spin up 20% (I've been known to ride up it at …

There's a 7 speed freewheel and a 3 speed sturmey archer IGH there too, and his final version had a triple on the front for 63 gears (3*7*3) …

You need to be moving (and pedalling) to change gears on a bike with derailleurs. So you should try to change down before stopping, to a small gear at the front and a big gear at the back. … The front gear are often labelled L...H for low to high, while the back gears are 1...8 (or anywhere between 5 and 11 depending on how many cogs you have) -- again low to high. …