• My hubs have a 6 speed Shimano Uniglide Sprocket. I would like to use a Shimano 600 Ultegra groupset on my bike but as I understand, this groupset does not come in a 6 speed edition. Would I be able to fit a 7 speed cassette on the hub? Or just use a 6 speed cassette with the Shimano 600 components as 7 speed and 6 speed spacings are similar? I read Sheldon Brown's page on 'speeds' but I'm still confused.
    Thanks for any help.

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