Shimano XTR RD-M985 P-Tension Spring

This spring is specifically engineered for the Shimano XTR RD-M985 rear derailleur. While it may appear similar to other springs, we strongly recommend verifying your derailleur model number on the back of the parallelogram to ensure a precise fit.

The most common indicator is a noticeable loss of chain tension or 'slop' in the derailleur cage, which often leads to ghost shifting or chain slap. If your derailleur feels sluggish or fails to snap back crisply when shifting, the spring has likely lost its elasticity.

Replacing a P-tension spring requires a moderate level of mechanical aptitude and specific tools to disassemble the derailleur pivot. If you are comfortable performing standard drivetrain maintenance, it is manageable, but be prepared for a fiddly process involving small parts and tension.

No, this is a replacement spring only. It does not include pins, circlips, or installation guides, so it is best to carefully organize the hardware you remove from your existing derailleur during the swap.

No. While a fresh spring restores tension, it cannot correct geometry issues. If your shifting remains inconsistent after installation, check your derailleur hanger alignment first, as a bent hanger is a much more common culprit for poor shifting performance.