I'm repairing an ancient Stumpjumper that came with 26/36/46 chainrings up front. The 36 and 46 were worn down to nubs so I ordered replacements that arrived yesterday. While starting work on the bike today, I've discovered that a 34 was shipped instead of the 36 I wanted.
The rear has 5 cogs in good condition, smallest=14 teeth, largest=28. I'm replacing the chain with a new SRAM PC850, and the front derailleur with a used Shimano 600.
1. Call the LBS Monday and have them reorder the 36. I'll probably get it by Wednesday and I'll finish the bike for next weekend.
2. Install the 34 and ride tomorrow.
Is there a good reason to gear a MTB with 26/34/46 chainrings or should I just be patient and exchange the chainring next week?