Originally Posted by
Raging_Bulls
Keep in mind that switching from a 42 to a 48 will only increase the speed at identical RPM by about 14%. Basically your 12 MPH will become 13.7 MPH.
That's the same calculation I've made.
I dropped by a LBS to get a quote or parts they thought would work with this type of modificatione. The total was about $75 (crank set, crank set tool, chain, and MY labor). Given how little I ride this bike, the modification just isn't worth it at this time.
If I start doing less trail riding on my Gary Fisher and start doing more road riding, I might revisit the issue (or save the money to just buy a "real" road bike when finances allows).
Thanks for everyone's input.