E Thirteen Dropper Posts

Getting the Fit Right: Diameters, Insertion Depth, and Routing

Before anything else, measure twice. E Thirteen dropper posts are available in 30.9mm, 31.6mm, and 34.9mm seatpost diameters, covering the majority of modern trail and enduro frames. Getting the diameter wrong is an obvious one, but the mistake riders more often make is ignoring insertion depth - the minimum amount of post that must sit inside the seat tube. Get that calculation wrong and you're either running out of drop or, worse, stressing the frame at the clamp.

The process: measure from your seat collar to the bottom bracket shell, subtract your minimum insertion depth, and cross-reference that number against the post's overall length and the travel you actually want. The Vario Infinite's tool-free travel adjustment helps here - if your frame sits at an awkward number, you can dial the drop back in 5mm steps rather than hunting for an entirely different post.

Internal cable routing is a firm requirement with E Thirteen droppers. If your frame runs externally routed cable, you'll need a workaround or a different post altogether. Check your frame's routing before adding to basket. On the remote side, E Thirteen posts use standard cable actuation - the cable head clamps at the lever in the conventional way - so they'll pair with most aftermarket remotes. That said, for specific lever compatibility, ergonomics, and clamp options, head to our dedicated E Thirteen Dropper Levers page where we cover those choices properly. It's worth doing before you commit to a lever you'll hate by the second climb.

Stack height is the other number people forget. A longer post with a taller head assembly can eat into your minimum saddle height. Check the published stack figure against your fit before ordering, particularly if you're on the shorter side of a frame size.

Vario Infinite vs the TRS+: What's Actually Changed

E Thirteen's older TRS+ dropper operated on a fully mechanical, coil-sprung system with stepped positions - functional, tough, but limited to fixed drop increments and dependent on the coil spring for return force. Cold weather slowed it down. Wear showed in the indexing over time. It was honest kit that did the job, but it had a ceiling.

The Vario Infinite moves the game on in two meaningful ways. First, the replaceable gas-charged spring cartridge replaces the coil entirely. Gas springs return faster and more consistently across a wider temperature range - relevant when you're riding Welsh trail centres in February and the temperature is hovering around three degrees. Second, the return force doesn't degrade gradually the way a tired coil does; when the cartridge is done, you swap it out and you're back to factory feel.

The other upgrade is structural. The 3D forged stanchion and head on the Vario Infinite gives the post noticeably more torsional stiffness than a machined or extruded equivalent. In practice, that means less twist under hard pedalling and a more planted feel when you're driving out of a berm. It's not dramatic, but it's the kind of thing you notice after a ride rather than during it.

The Vario Infinite travel adjustment is the headline feature for riders running multiple frames or sharing a post between builds. Unthread the collar, rotate the internal adjustment bushing to your chosen setting, re-tighten. No tools, no shim kit faff. You get a 30mm adjustment window across six positions. If you're comparing this against something like a RockShox dropper or a OneUp post, the tool-free adjustability is a genuine differentiator rather than marketing padding.

The TRS+ still appears on the used market and occasionally at clearance prices. If your budget is tight and you're riding in milder conditions, it's not a bad post. But for anyone buying new, the Vario Infinite is the sensible choice.

UK Conditions and Keeping It Running Through Winter

British riding in autumn and winter is essentially an accelerated durability test for any component with moving parts and a seal. The mud around Dartmoor or the North Yorkshire Moors isn't just wet - it carries fine grit that works into wiper seals like grinding paste. Hydraulic posts ingest this and either weep fluid, develop air pockets, or start returning with the enthusiasm of someone getting out of bed at 5am. Bleeding them at home is doable but fiddly, and some designs effectively require workshop attention.

E Thirteen's gas-spring approach sidesteps most of that. The sealed gas cartridge means there's no hydraulic fluid to contaminate and no bleed procedure to learn. When the cartridge eventually loses pressure or starts returning slowly, you replace it - a straightforward job with basic hand tools and no specialist kit. That's a meaningful practical advantage if you're servicing your own bike on a Sunday evening before a Monday ride.

For day-to-day maintenance, keep it simple: after muddy rides, rinse the post and stanchion before the muck dries hard. Every few months - or more frequently in heavy winter use - pull the post from the frame, clean the collar area thoroughly, and re-grease the brass keys that guide the stanchion. These wear over time and are the first thing to check if you notice any play developing. The wiper seal at the collar is the other serviceable part; replace it when it starts letting dirt past rather than waiting for the stanchion to score.

If you're running E Thirteen's drivetrain components alongside - their chainsets and cranks or bottom brackets - the same mud-management principles apply across the build. A clean drivetrain makes post servicing easier because you're not fighting contamination from two directions at once.

How does the Vario Infinite stack up against something like a Fox Transfer or a PNW dropper in these conditions? The Fox runs hydraulic and is very well sealed, but it does require bleeding when the internals get compromised - and that's a more involved job. The PNW uses a similar cable-actuated gas approach and is competitive on simplicity. E Thirteen's edge is the replaceable cartridge combined with the tool-free travel adjustment; neither Fox nor PNW offer both in the same package at this level. Worth checking current prices on the Brand X dropper range too if budget is a constraint - they sit below all of the above but lack the adjustability. Pairing your post with a fresh set of E Thirteen MTB tyres while you're refreshing the bike makes sense if you're building a reliable winter setup from scratch.