Fitting new gears, chain, cables and mechs this weekend – any tips?
Built two bikes myself now. Youtube was a massive help.Posted 4 years ago
rear mech install minus the cable. Set high and low limits by moving the mech across the cassette by hand. Make sure shifter is in high gear and runs smooth in high. Install the cable, and in theory it should work first time.ScapegoatSubscriber
Right. Front mech. They can be a pain, but not if you go about it logically and calmly.
1. Wedge a 5mm hex key in the mech so it’s in “high” position. You can use the cable pull clamp to pull it apart and insert the allen key like this:
Put the band round the seat tube and screw it up to finger tight, then undo a half turn so it can be adjusted but won’t slip straight off again.
Align the cage of the mech so that it is about 3mm clear of the outer ring or bash, whichever you have.
Once you have established teh correct height, look down from above and make sure the inside edge of the cage is exactly parallel with the chainrings.
Aligned in both planes now, you can do up the clamp band and remove the allen key.
Release the shifter so it’s under no tension, (ie indexed to the inner ring) and add the cable. Clamp it to the front mech with no slack to start with. (make sure the shifter barrel adjusters are wound in all the way, then a turn or two back out to give you some leeway) . . Once the chain is on work out which limit screw affects the cage in “low” and look from above as you screw it in or out. Put the chain on largest sprocket and teh inner chainring and adjust the limit screw to give 1-1.5 mm of clearance between the inside of the inner plate of the cage and the chain.
Shift the chain to outer ring, and the smallest sprocket. Again, use the limit screw to wind the cage in or out so that there is 1-2mm clearance between the chain and the inside of the outer cage plate.
If you have a triple, shift to the middle of the cassette and then shift between chainrings at the front using the shifter. You may need to fine tune by adding or lessening cable tension with the barrel adjuster, but you shouldn’t be far off with this formula.Posted 4 years ago
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