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There are bicycles with a crankshaft that runs through the rear axle. The "Tur Meccanica Bi Bici" is such a bicycle: I can't tell from your picture if it's the same bike or not, but it certainly could be.

They aren't necessary, but they are a great help to properly aligning your wheel in the dropouts in an efficient manner. If these screws are adjusted correctly, you'll be able to just put your wheel in, pull it all the way back and tighten your axle nuts and your wheel will be arrow straight in the frame. If not, You'll need to manually align your wheel each ...

I guess the derailleur hanger or the bit of frame it connects to must be bent. These can be bent back. Of course Sheldon Brown has some advice, but I'd be afraid to do this myself and instead take it to the LBS who will have the tools.

To follow up on Tha Riddla's answer: If your freewheel is freewheeling in both directions, in all likelihood it is gummed up inside and the pawls are stuck open. (As a small note: the freewheel is separate from the hub and contains bearings, pawls, springs, and some lubricant.) You can either try to overhaul the freewheel or purchase a new one (they range ...

If you can find nuts with the correct thread (both diameter and thread pitch) but a smaller wrench size, you can replace the ones that are there. But note that the existing nuts probably have a built-in washer, and any replacement should have the built-in washer not too much smaller than what you have. In a pinch you can use regular washerless nuts and a ...

As a "home solution" for a lockring wrench, I've seen photos of people taking a large pair of waterpump pliars, ( buy a cheap pair with the proper jaw width ), and then grinding out a "slot" just back of the tips of the jaws so the tips would fit down into the "U" shaped cutouts and serve as a lockring tool to remove the outer ring from the cog.

Your body position may be an issue. When the terrein is loose, you need more weight on top of the bike. So as you lean and carve into the corner, you may need to lean the bike, and your body at different angles. Essentially leaning your body less, and shifting weight to still provide downward pressure vs all lateral pressure relying too much on grip and ...

I'll take a guess that you didn't keep the bike upright during the flat change, which led to the chain coming off inside the chain case. I had the same thing happen to me on a bakfiets, which also has a fully enclosed chain and an internal rear hub, I have detailed instructions how I recommend removing the wheel of a bakfiets, but I think the "trick" you ...