>>1357551very heavy duty frames with thicc chains,
for a long time they insisted on fully enclosed oil bathed chains.
the bike was expected to last a life time or three,
due to such concerns the epicyclic drive (internal hub planetary gear set) was preferred.
and where derailleurs were used the cassette moves sideways not the chain,
thus avoiding chain skew and allowing the use of a thicker and stronger chain.
>>1357603>press F to pay respects 