Hello all,

We have an old Trek tandem that has finally worn out all the drivetrain. It is from the early '90s and we picked it up 10 years ago with about 500 miles on it at that point. Since then we have run the wheels off it.

My question is simple most tandems that have chains for timing (not belts) seem to use 38 T or larger rings, ours included. 36 T rings are much cheaper as are chainguards that we want to add.

Any reason not to use smaller rings other than wear out time? Bigger rings would be smoother in theory anything else?

thanks
Ruben in So Cal