Ask a Mechanic: Shimano Front Derailleur Trim Set-Up and Adjustment Ask a Mechanic: Shimano Front Derailleur Trim Set-Up and Adjustment Greg O'Keeffe2015-12-16T14:24:40-08:00 Liam writes, there seem to be four index positions on my Shimano 105 5800 Ask a Mechanic: Shimano Front Derailleur Trim Set-Up and AdjustmentGreg O'Keeffe2015-12-16T14:24:40-08:00