Not quite a tyre-fitting panacea, but ideal for weak thumbs and on cold days City and mountain bike tyres go on and off by hand as easy as Tupperware tops. Narrower road or touring tyres don't. Sure, ...

levers use mechanical advantage to make lifting or applying pressure easier the three main parts of a lever are the effort (input force), fulcrum (pivot point), and load (output force) there are three ...