My (ancienne) bike currently has a 52-42 at the front and 26/13, 7 speed at the back. I'm thinking of entering the Jennings Rivers Ride next month, and it's been pointed out that with my bottom gear being 52", I may not have enough leverage to get over Honister.
I've been thinking about solutions (on a tight budget), and one that seems to stand out is buying a chainring in the region of 36 or 38T and fitting it in place of the current 42T. However, I'm not sure it's that simple, so help me out. The cranks are 5 bolt, but do all 5-bolt cranks have the bolts in the same place (the circle of bolts has the same diameter), such that all 5-bolt rings are interchangeable, or do different companies have different standards?
TL;DR Are all 5-bolt chainrings interchangeable?