I just bought a used bike and can shift up to 4 going down in gears from the big thumb trigger but only allows me to double up shift with the trigger when I am in the 2 biggest cogs. If I am in 3-9 it only upshifts 1 at a time but if I am in 1-2 it can do a double shift. Any Suggestions? Thanks...
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Thread: sl-m970 multiple shifting up