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52 tooth chainring, no problem but the difference is kind of small and not necessarily worth the trouble. 10 speed cassette, for road bikes the same derailleur works but you need narrower chain and s …

Positron doesn't have return spring but instead uses single wire for pushing and pulling. That means you have to replace the cable and shift lever, too. The photo shows that the bike has claw mount d …

Different from the other answer, I read the question as OP wanting to change to lower gear ratio without changing chain length. 52/15 is an extremely high ratio. For all practical purposes, if you wa …

I agree this is probably an issue with bike fit, or just not being used to handling a road bike. If the bike is roughly correct size, I'd suggest a different approach: If there is too much weight on …

Both shifters are numbered so that so that higher number gives larger gear ratio. In front it's the larger cog, in the rear smaller.

The inner width of derailleur chain is supposed to be the same regardless of number of speeds, so you may get away with using narrower chain. I have been using 9-speed Campagnolo chain with 8-speed Sh …

The standard setup is left for front and right for rear for gears. For gears you would need special left rear and right front shifters, which are not manufactured. …

38% is a huge difference, and very noticeable on road. Since the bike you are considering has 622mm rims, it adds even more to the effective gear ratio.

Specialites TA makes a 50 tooth 9-speed chainring for MTB cranks. Since the inner width of all derailleur chains is the same, it is probable that the outer ring from 9-speed series does not cause prob …

Cranks and chainrings are made of aluminium, which does not rust. You'll probably be fine with cleaning them and new cassette and chain. This isn't that expensive any more. From quick googling, your b …

The 7 and 8 speed cassettes have slightly different spacing (see http://sheldonbrown.com/cribsheet-spacing.html), so the derailleur will be slightly, almost unnoticeably, out of adjustment at largest …

These things have a coaster brake and shift gears every time you brake, no cables required. …

They're called simply chainring bolts. The tool to hold the other part while tightening is chainring bolt wrench.

34/50 is a standard combination, so 34/48 should work without problems. Friction shifters just make it easier to overshift and trim on the fly.

You can add a few teeth, but not enough to make a significant difference. The photo shows that the front derailleur can be moved upwards by about 0.7cm, which would be enough to add 3 teeth. The spaci …