fulcrum zeros / shimano 10 speed need spacer for casette?

ukracer
ukracer Posts: 421
edited March 2012 in Workshop
As a follow up from my question the other day ref cassette ration change , do i need to first use any spacers for my 105 10 speed cassette with my zeros?

How do i find out for future reference?

How do i know if chain too short ?
Regards

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