Dust and dirt is, perhaps, the main enemies of nodes of the bike. Particularly affected by these uninvited abrasives bearings of the carriage. To significantly increase sroi their service, I suggest between the housing of the carriage and a pedal crankset to install a homemade felt seals that can be cut out even from old boots. The intersection of this felt washer and the parts of the bike are lubricated with grease type tsiatim.
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For those who often have to go up and down with the bike on the stairs, might want a special handle for carrying. It is made of metal tube 18...25 mm and is fixed by welding or clamps to...
