I buy that bike from pawnshop for $96. I trfy to setup carnk size and cassete size for do century never i have do that. I have put 53-39 crank and cassete 9 speeds 12-25. I want found one cassete 12-23 or 13-23 include the 16 and 18. I want see why people say 16 and 18 tooth is magic. Is better i have cassete with more low gears like 28 tooth? Today i buy from thrift store one mountain bike wheel 26" have cassete 11-32 8 speeds. i wonder if i can try on my bike that cassete with the 53/39 crank. But i not think i can try without i have longer cassete or replace derailleur my bike have short cage now. with what tooth is good to start road bike. 11 or 12 or if is 13 or 14 too is okay. and what is best low gear too General wide cassete is okay for road bike?