How to Adjust a Shimano Microshift

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Riding over bumps, crashing and having your bicycle bumped can cause your derailleur to become misaligned over time. A misaligned derailleur can cause your shifters to fail to shift properly. To ensure a smooth shift, you should periodically realign your shifters. This should be a part of your basic bicycle maintenance to keep your bicycle in good running order.

Things You'll Need

  • Allen wrenches
  • Phillips-head screwdriver
  • Lock your bike into your work stand. Set your bicycle upside down on the handlebars and seat if you do not have a bicycle work stand.

  • Loosen the cable stops on the derailleur using an Allen wrench. Turn these bolts in a counterclockwise direction, but do not completely remove them. Pedal your bicycle by hand to allow derailleur to guide the chain to the smallest gear settings.

  • Pedal the bicycle by hand as you stand behind your bicycle. Check the alignment of the rear derailleur over the smallest cog of your gears. Loosen the high-limit screw -- marked with an "H" -- on the derailleur if it is pushing the chain to the left of the smallest gear. Tighten the high-limit screw if the derailleur is pushing the chain to the right. Use a screwdriver to tighten or loosen the limit screws.

  • Look at the front derailleur. Tighten the low-limit screw -- marked with an "L" -- with a screwdriver if the derailleur is pushing the chain to the right of the cog. Loosen the low-limit screw if the derailleur is pushing the chain to the left of the cog.

  • Shift the front derailleur to the largest gear. Watch the alignment of the derailleur over the large cog. Tighten your high-limit screw on the front derailleur until the chain just comes into contact with the derailleur. Loosen the high-limit screw until the chain no longer rubs on the derailleur as it is being pedaled.

  • Tighten the cable stops on both derailleurs with an Allen wrench.

References

  • "The Big Blue Book of Bicycle Repair 2nd Ed."; C. Calvin Jones; 2008
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