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Josh
GroggyJoe
So I can switch ratios on the rear wheel without having to faff around with retensioning the chain afterwards.
I hate retensioning the chain - I seem to always find it's either too short, or I have to readjust the pads to line up with the rim again, or shuffle the mudguard around, or a combination of the above. Much easier to set all that once and use the tensioner!
There was one on eBay earlier for £50 but it seems to have gone already.