Join Date: Apr 2010
Location: Vlaamse Ardennen, Belgium
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Any hard pedaling is hard on one's knees.
So to be able to conquer steep hills and still save your knees, get your gears as low as possible.
Why do you need a double chainring?
Why isn't a triple chainring an option?
I've got a 30-42-52 chainring with a 11-28 cassette ... this combination gives my higher AND lower gears than any of the combinations you mentioned.
The difference in weight between a double and a triple chainset is marginal unless you are doing races and I assume you are not doing any races since you care about your knees
Why not simply get typical touring bike gears? 28-38-48 with 11-32 will give your a lowest gear of 28/32, which should be low enough for anyone to save his knees while climbing ... and the highest gear of 48/11 should definately be enough for anyone not trying to get his average speed over 20 mph.