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@simonw7
I had the same concerns when I started riding fixed about 8 months ago, as I have had torn cartilage removed in the past. I set up my conversion with 42/16 which is pretty easy in west London, and never had any problem. However I just took my new flyer out for first proper ride on friday night which is set up as 46/17 fixed, did about 20 miles, next day my knees were very sore. Either it is the extra gear inches or some other aspect of how it is set up, as I have not got round to optimising it yet. But my hunch is that the extra inches caused it, and that is without any skidding which I've always been reluctant to try due to knee problems.