The Ohlins YA638 TTX RT rear shock absorber is built for Yamaha YZF R1 applications where consistent damping and clear chassis feedback matter. Based on Ohlins twin-tube TTX architecture, it is designed to maintain stability and traction under demanding riding conditions. This is a gas-pressurised, oil/gas separated rear mono shock intended for precise control rather than comfort-biased compliance.

Ohlins | Made to race, perfected to ride

TTX RT is Ohlins’ track-focused rear shock platform, using a twin-tube damping layout to keep oil flow controlled and repeatable. The result is predictable response across long sessions and varying conditions, helping you keep the bike settled when load transfers quickly.

Shock design & features

  • Twin-tube TTX damping architecture for stable, consistent behaviour
  • Gas-pressurised, oil/gas separated design to reduce aeration and maintain damping control
  • Rear mono configuration to suit the Yamaha YZF R1 linkage and chassis layout

Tuning controls

This shock provides external adjustment for rebound damping and compression damping, allowing you to tune feel and support to match tyres, track grip and rider preference. Independent circuits help changes remain meaningful and repeatable.

Base setup (factory preset)

The YA638 is supplied with an Ohlins-fitted spring and a factory baseline intended to be a workable starting point for most riders. Fine-tuning is typically done after confirming sag and ride height for your load and use.

Before you install

  • Confirm the application is Yamaha YZF R1 and that your model/year matches this fitment
  • Set rider sag and check clearance through full suspension travel after installation
  • Record your starting adjuster positions before making changes, so you can return to baseline if needed
SKU YA638
Model # T36PR1C1LS
Brand Ohlins
Shipping Weight 5.0000kg
Shipping Size 0.300 x 0.300 x 0.500m
Type Units
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If your Motorcycle is listed below, this product will suit:

Position (Front or Rear) Rear Mono
Shock Length Eye to Eye (mm) 302.0 +4/-2
Spring Rate Standard 95.0 N/mm
Type Code T36PR1C1LS
Stroke Metal to Metal (mm) 65.0
Product Family TTX RT
Fitted Spring: 21040-31

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