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Gaston-
153 is light right?
i could not find the weights of single levers but
438g for ultegra both levers
https://road.cc/content/buyers-guide/201326-head-head-shimano-105-r7000r7020-v-shimano-ultegra-r8000r8020?amp=&page=2
:)
jBola
YE! do it! use a downtube shifter for super lightness!