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Thinking of going 28-9, tried a mates, was very nice
The smallest freewheel, ie sprocket that you thread onto the outside of a hub that you can buy is a 13T Oddysey, and it will run on a flip-flop hub small side (30mm dia) which means you can get down to 36T front for normal riding, possibly a 34T to 33T if you're riding parks a lot and need acceleration not top speed.To run a 25T front chainwheel you need a rear wheel built with a cassette hub specifically designed for the task, ie to run a 9T cog. I doubt that you bike has this, but take a close up of the rear hub and I'll let you know.If you need to buy a hub and re-lace it into your rim, you'd best sit down as it won't be cheap Spen