New answers tagged upgrades
3
It may be that your requirements would suit a wide-ranging triple chainset rather than a double. A common MTB triple might be 22/34/44 tooth which would suit you nicely, and 44:11 would give the top-end ratios you want.
Buying new is likely to be costly, so a cheap donor bike bought from the local recycling depot could be the best source of parts.
You will ...
9
Your math and the reasoning are correct.
The main issue in your problem is to find a compatible crankset. The points to consider: the bottom bracket width, the kind of bottom bracket that you have and the clearance between the frame and the chainrings.
If your bottom bracket is 73mm, you are limited to MTB components (or trekking if you fancy the idea of 3 ...
4
Any 8 speed derailleur should work fine - the higher the "grade" the better made they are.
However the incremental difference is slight, and simply "not mashed" could be all you need as long as it performed satisfactorilly beforehand.
Another way to view it is that the same part has a cost of $x, and a fancier unit has cost $y, but you ...
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