Are there smaller chain rings available for Shimano Tiagra Triple? I have a Shimano Tiagra Triple 30/39/50 and I want to find out what is compatible in terms of smaller chainrings for touring. Ideally, I’d like to be able to go down to a 26 or even a 24 for the smallest. Thinking in term of 26/36/46 or 48. This is a 4 bolt crank and it seems there’s little to no compatibility with other sets.
Unfortunately the asymmetric four bolt pattern that Shimano switched to for these cranks is a new patttern and so far there are no small inner rings available. The best advice I can give is to switch to the older five bolt style crank, for which many small rings are available. I use 26-39-50 on the previous generation of Tiagra with no trouble.