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@generation99
I started optimisitically on a 16/48 ratio. Im dont do a massive commute and there are couple of steep but short hills on my route. However after a few months I noticed pains in my knees which ive never had before. Not only that but was seemed to get overtaken a lot. I switched to a 16/44 and the difference was noticeable, knees stpped hurting ad much faster. There is definitely as safety issue with too high a hear ratio, it will damage your knees. start somewhere in the middle . most likely tou will switch your chain ring in 6-9 months anyway or max 12 months, so you can always go higher lower. Even start with cheap chain rings that you know you will replace often and experiment.