i suspect Period shimano 600 which would be shimano/ultegra is superior and that that consumables are WAY most readily available, I.e. chain and cassette/freewheel.
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1 Super Record bike, 1 Nuovo Record bike, 1 Pista, 1 Road, 1 Cyclocross/Allrounder, 1 MTB, 1 Touring, 1 Fixed gear