• Friction! Currently running a simplex system with stem mounted shifter. Thinking of changing to a tiagra 8-speed derailleur and setting it up as a 1 x 7 - still friction with the limit stews set
    ( just what I have as spare parts etc.) just unsure whats possible with the rear spacing.

  • If the spacing is 126mm, then just buy the Shimano RS11 wheelset*, with some change left over for a 7 speed cassette (+spacer) and chain, cassette should be about a tenner, and fiver for chains.

    *Shimano RS010 should be slightly cheaper to get a set for under £100

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