3T Ionic 25 LTD Stealth Seatpost

3T Ionic 25 LTD Stealth Seatpost Info

3T has a winner with their Alloy DiffLock saddle clamp. They’ve updated their Ionic LTD Stealth Seatpost to bring the quality and execution of the post to another level.

The clamp is an impressive piece of engineering that works so well, you’ll never notice it. Essentially, the clamp has at its heart two sets of toothed cylinders, the smaller fits into the larger. And then the larger slides into a cylindrical hole in the post, which also sports teeth. You macro-adjust via the larger cylinder and micro-adjust via the smaller. And then, when you’re satisfied with the tilt, you can adjust setback. When you’re satisfied with the position, you slide on the rail clamps and tighten each side to seven newton-meters of torque with a 4mm Allen-head wrench.

Note that the clamp is designed to work with round rails only. There is an accessory clamp, which can be purchased separately for oval rails.

While the clamp is complicated, the shaft is easy. It’s a straight tube made of high modulus carbon fiber and finished with a uni-directional layer.

The post comes in a variety of diameters and lengths and with two different setbacks, zero and 25mm. The straight 31.6mm x 280mm post weighs in at a scant 180g.

The 3T Ionic LTD Stealth Seatpost is so good, you’ll only notice it when you’re setting it up.