Today I swapped out the stock 36 (steel) tooth chainring for a 38 Chainring (steel) on the PF4. Looking for a little better speed per gear. 4th-11mph, 5th-13mph, 6th-15mph, 7th-17mph these are max sustained cadence speeds. Most of the trail riding is 9-13mph and paved is 15-20mph. I am seeing...