I've been cycling through London for a few months now on my el cheapo Halfords folder (don't recommend them to anyone), I needed a folder, had very little money, and it was cheap.
Anyway, heres the questions.
1. Face masks. Do they work? If I get caught behind a bus (unless its the solitary fuel cell one), it can be pretty unpleasant. Do they reduce a fair amount of the crud emitted by knackered old diesels?
2. The seat stem is bending. Has anyone experienced this? I'm not that heavy, about 85kilos, but all the weight is on the back end. Are the majority of stems a standard size. May have to get one designed for a brompton or other decent folder.
3. Brakes. They squeal like mad. Will that be down to the pads, or the rim, or a combination of both?
4. The bike uses 16x1.75 tyres. The only decent tyre that I've found at that size is the Schwalbe Marathon, are there any others out there?