I've changed the chain ring of my Speed 8 to a smaller one, 52 to 42. Wondering what is the effect on the gear range. Can someone help me calculate the new gear range with this mod? Does this reduce the gearing by 25%? The original cassette 11 -32t remains.
Speed P8 31-91' (with 52 chain ring)
42 chain ring = 24 - 69 (is this correct?)
Hope to do some serious climbing with the new mod. Many thanks!