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Mecánica Fácil BIKE: Cómo ajustar el cambio trasero Shimano.
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Mecánica Fácil BIKE: Cómo ajustar el cambio trasero Shimano.

How to Adjust a Shimano XT Gear Step by Step

Introduction to Tools and Initial Setup

  • To adjust a Shimano XT gear, you will need two Allen wrenches (No. 4 and No. 2) and a measuring tape. The video explains the purpose of each tool before starting the adjustment process.
  • Begin by placing the chain on the smallest cog. This is crucial for proper adjustment as it sets the baseline for tuning the derailleur.

Understanding Gear Adjustment Components

  • Familiarize yourself with three key screws on your Shimano derailleur:
  • L (Low Speed): Adjusts the upper limit to prevent chain from jumping into spokes.
  • H (High Speed): Adjusts the lower limit to prevent chain from falling onto the frame.
  • Ensure that if your Shimano derailleur has an RD tension system, it is deactivated before proceeding with adjustments.

Adjusting Upper Limit Screw

  • Start adjusting from the upper limit screw:
  • Push the derailleur while pedaling gently to shift the chain onto the largest cog.
  • If it jumps into spokes, tighten screw L by a quarter turn; if it doesn't reach, loosen screw L by a quarter turn until properly seated.

Setting Distance Between Pulley and Cogs

  • Before adjusting lower limits, set distance between upper pulley and cogs while in highest gear:
  • Ideal distance is about 8-9 mm for a cassette with a 46-tooth cog; for cassettes with smaller cogs (42 teeth or less), aim for approximately 5-6 mm.
  • To adjust this distance, loosen or tighten the attack screw accordingly.

Adjusting Lower Limit Screw

  • Pull out on derailleur while pedaling to check if chain can drop onto smallest cog:
  • If it falls towards frame, tighten screw H by about a quarter turn; if it doesn’t drop down fully, loosen screw H similarly until functioning correctly.

Final Tension Adjustment and Maintenance Tips

  • After completing all adjustments, secure cable tension using its clamp:
  • Starting from smallest cog, test shifting through gears one at a time while pedaling.
  • If shifts are missed upwards, increase cable tension by turning counterclockwise; if too many shifts occur downwards, reduce tension clockwise.
  • Confirm smooth operation across all gears indicates successful adjustment of your gear system.
Video description

Un perfecto ajuste del cambio trasero es sinónimo de calidad en nuestras salidas en bici. Siguiendo estos pasos aprenderás de una vez por todas a ajustar correctamente un cambio trasero Shimano.