"ratasseadmed" - 1 õppematerjal

Jalgrataste kasutamine ja rattasport Eestis

................................................................................................2 ..............................................................................................................................................2 SISSEJUHATUS.................................................................................................................. 3 RATTA TEKKIMINE ÜHISKONDA................................................................................. 5 Mehhaanilised ratasseadmed.............................................................................................6 JALGRATAS........................................................................................................................8 UURIMUS JALGRATASTE KASUTAMISE KOHTA 21. SAJANDIL EESTIS...........11 Eesmärk...........................................................................................................................12