Originally Posted by August West

My Trek Domane came with an 11-34T cassette but for my local road rides around here I don't need that low of gearing so I've ordered an 11-30T for the tighter gear ratios. Rear mech is an Ultegra RD-R8000-GS med. cage.

Is there any reason I can't leave the chain length as it is when I run the 11-30T? When I ride steeper terrain I would like the option to go back to the 11-34T cassette but it would make things simpler if I could use the same chain instead of having dedicated chains for each cassette.

Thanks.