Hi All, Just seeking some feedback on longevity and replacement of sprockets and chain. I ride a 650 single on and off road, don't flog things and clean the chain after each ride. After 35,000 Km the front sprocket teeth are visibly thinned and curved. The rear sprocket looks pretty good with only slight thinning and curve. I have never taken the chain off to test wear but have been impressed that I have only had to adjust it twice in some 5 years (although this is in comparison to pre o-ring chains in the 1980s which wore comparatively quickly). I am tempted to just replace the front sprocket (tight-arse syndrome). However am aware of the adage that both sprockets and chain should be replaced together, as they wear together, but not sure if this is fact or marketing? So, if you also ride a big thumper, don't flog it but do maintain it I am very interested to hear your thoughts and experiences on: - at what Km you replaced chain and or sprockets? - have you ever just replaced a front sprocket? And did this cause more problems than it solved etc? - are there any key signs that a sprocket is at the end of its service life? Appreciate any feedback and responses.