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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.
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There are certain areas in e.g Hackney that are bike theft hotspots. There should be some way of sharing this information with others online. There used to be a google maps mash up of bike thefts (i couldnt locate it now) but it was very little used. If people shared when they had bike/parts stolen you could build up a picture of the most risky places to leave a bike. There are also places where its common knowledge bikes are sold on. If you can get the police to mark you bike and you happen to locate it you have no chance of getting it back unless you can prove its yours. Ive heard of many poeple buying back bikes that have been stolen.