| My problem is that with the chain on the small chainring it rubs on the large chainring when I shift to the 7th or 8th cog on back. |
| The chain should be able to go from the big chainring over the biggest cog, but the rear derailleur should be stretched out almost straight to do it. |
| Since it is easy to undershift or overshift, each lever must be adjusted manually to its optimal position on the cog or chainring. |
| See if you can lift the chain away from the front of the large chainring or the back of the largest cog. |
| I would like to replace the crank to get a 39 chainring up front, I just can't climb on the 42 like I did 20 years ago. |
| Yes, the chainring, cog and chain must all be on the same standard or parts will either not engage or will wear out quickly due to excess slop. |
