• Thanks for the advice, re the "lasting magic gear" apologies for the question based on ignorance but does a tensioner allow you to change the ration of the fixed gear in case you find out that the one you have gone for turns out to be harder (or too easy) to turn that you had first thought? I'm looking to use the bike as single speed to and from work and around London basically, not really many hills to speak of coming in from Kingston way.

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