New answers tagged crankset
First, assuming a pedal rpm of 90, your speed with the 42/11 would be about 26.5-27 mph. with a 48/11, 30-30.5 mph. The cranks must be compatible with the bottom bracket; for example, square taper. With the 6 tooth larger chain-ring, you may need to replace the front derailleur. You'll need a longer chain with a larger chain-ring. And remember, your low ...
The best solution I found so far are chainring spacers: http://sheldonbrown.com/chainline.html
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