>>1447772There are serious compromises involved, but it's very doable. The fact that you're measuring things in speed, and wrongly isn't a good sign.
Don't get the cheapest thing on two wheels and expect it to work well.
Pic related. It's one of Sheldon Brown's folding tourers.
>>1447739Very
>>1447721Tires can be plugged, but that one looks like it would probably glue shut reasonably well.
>>1447630If your spokes are old and rusted rebuild the wheel entirely and replace them all rather than going one at a time as they fail.
>>1447575Hundereds of good options in that price range.
>>1447442No. See MTB baggies.
>>1447439Dozens of potential reasons. Try cleaning both pads and disc thoroughly first, and check alignment.
>>1447351I would bet weak core. Bike fit is also likely.