Electronic fish scale. You can even get a dial scale. Hang it up, and hang the bike or compnent on it. Some are pretty accurate.
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"Remember: a bicycle is an elegant and efficient tool designed for seeking out and defeating people who aren't as good as you."
--BikeSnobNYC
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"Remember: a bicycle is an elegant and efficient tool designed for seeking out and defeating people who aren't as good as you."
--BikeSnobNYC