Not sure what sized bike is best?
Answer a few short questions and we'll make a recommendation on which size is best for you.
Shop Trans X
Trans X blends real Bike technology with prices made for everyday cycling. Its dropper seat posts give you smooth control, durable aluminium construction and clever engineering usually found only in premium parts.
Great for trail riders, commuters or beginners wanting reliable performance without paying top-dollar.
The Trans X Story
Trans X is the after-market bicycle brand of JD Components Co., Ltd., a Taiwanese manufacturer founded in 1986 known for producing aluminium stems, handlebars, seat posts and headsets. The Trans X name was launched in 1992 for JD’s bicycle component brand and sells both Original Equipment Manufacturer components and aftermarket parts globally.
Through decades of development in alloy materials, cable routing innovations and dropper post systems, Trans X delivers quality that lets everyday riders access technology once reserved for high-end builds.
Shop Trans X Categories
Why Ride Trans X?
- Alloy engineered for strength and lightness. Many Trans X dropper posts use high-grade aluminium like grade 6061-T6 or 7075-T651 combining durability with low weight so your bike handles well and parts last.
- Cable routing options to suit your frame. Internal and external routing lets you choose the clean look or easier maintenance depending on your frame style.
- Versatile travel lengths and adjustments. Whether you ride trails, city streets or steep climbs, Trans X offers droppers with varying travel distances and even stepped adjustment features in some models for better fit.
- Strong OEM heritage and global presence. Backed by years of Original Equipment Manufacturer supply, Trans X parts are trusted by multiple brands and supported with parts, service and spare components worldwide.
Popular Trans X Ranges Explained
Trans X Sp23
The Trans X Sp23 is an internally routed dropper post made from 7075 aluminium. Travel options up to about 200 millimetres make it ideal for riders who need long drop for steep terrain while keeping muscle fatigue lower.
Trans X Sp39j
The Trans X Sp39j gives you internal routing with generous length and travel in a 34.9 millimetre diameter. It suits frames built for bigger posts and riders who want maximum drop without compromising stiffness.
Trans X Ysp19
The Trans X Ysp19 has external cable routing and shorter travel around 125 millimetres. It's great for riders who want dropper functionality without internal frame routing or needing full travel.
Trans X Sp39
The Trans X Sp39 blends internal routing with lighter-weight 7075 alloy and mid-to-long travel options. Expect reliable performance for modern trail, enduro or shared ride bikes needing solid dropper support.
Trans X 23j
The Trans X 23j is designed for riders who want internal routing with long travel (around 200 millimetres) in a standard diameter of about 31.6–30.9 millimetres. Good for taller riders or dropper setups that need maximum insertion.
Trans X Si13j Internal
The Trans X Si13j Internal range adds adjustable travel between roughly 170-200 millimetres via a stepped bushing and offers a longer overall post length of about 558 millimetres. Excellent when you need extended drop support on bigger frames.
