The TRANZX YSP38J fills a real gap in the dropper market: a 27.2mm diameter post that brings saddle-height control to frames that can't run larger diameters — common on older XC, gravel, and smaller MTB frames.

  • 27.2mm diameter — fits frames not served by 30.9mm or 31.6mm posts
  • 110mm travel — appropriate for shorter seat tubes on small frames
  • Internal cable routing for a clean build on compatible frames
  • 405mm total length suits small and medium frame sizes

The YSP38J uses hydraulic actuation for smooth, reliable actuation without mechanical cable stretch or feel. It's a practical, affordable way to add a dropper to bikes that are otherwise limited by their seat tube diameter.

Compatible with frames accepting a 27.2mm seatpost and internal dropper cable routing. Total length 405mm — check minimum insertion depth requirements for your frame before fitting.

Warranty claims for this product should be directed to Tune Cycles. Return the item to us with proof of purchase and we will manage the warranty process with the brand on your behalf.
  • 27.2mm diameter serves frames that don't accept larger dropper posts — no reducer shim needed
  • 110mm travel provides meaningful saddle drop for smaller frames with limited seat tube length
  • Internal cable routing for a tidy setup on compatible frames
  • 405mm total length sized for small and medium frames
  • Hydraulic actuation delivers smooth, consistent saddle movement
  • Allows riders on smaller bikes to enjoy the benefits of a dropper post
SpecificationValue
Diameter27.2mm
Travel110mm
Total Length405mm
Cable RoutingInternal
SKU KWT-JD-SP38J-272-110
Barcode # 724022618134
Brand TRANZX

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