Why not 105 for £24? A rear dérailleur on a TT bike hardly has to do much.
https://www.merlincycles.com/shimano-105-5701-rear-derailleur-black-49204.html?utm_campaign=googlebase-GB&utm_source=googlebase&utm_medium=shopping&utm_term=Road+Bike+Rear+Derailleurs&ucpo=25853&gclid=CjwKEAiAuKy1BRCY5bTuvPeopXcSJAAq4OVs7d67nGKKYvg7r20wOE4AE-gE5i3GwhwoZvSmidTM3xoCMknw_wcB
10 speed
@amey started
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Why not 105 for £24? A rear dérailleur on a TT bike hardly has to do much.