SIDIZ T50 2nd Generation vs T90: Which Fits Your Desk and Budget?

Three times the price? Fair question.

Two chairs from the same range can look alike in a thumbnail and sit at opposite ends of the price list. The T50 2nd Generation and the T90 are the clearest example in the current SIDIZ lineup. The gap is big enough that it deserves more than a glance at the photos.

We're SIDIZ Australia, and we sell a premium ergonomic office chair range that includes both models. This guide compares them spec by spec from the live pages, checked on 26 October 2026, so you can see what the extra money actually buys.

Price First

The T50 2nd Generation is $449 on pre-order, down from $529. The T90 is listed at $1,299, and the page shows a second figure of $1,379 beside it without saying what it represents. There is also a Natural Leather Limited Palette option, made to order with extra production time. At the listed price, the T90 costs almost three times the T50 2nd Generation.

Spec by Spec

The pattern is easy to spot. Wherever both pages state a figure for the armrests and headrest, the T90 gives more millimetres and more degrees. The one place the T50 2nd Generation states more is lumbar adjustment, where the T90 page gives no measurement. In short, the extra travel on the T90 sits in the arms and head, not the lower back.

What the T90's Extra Travel Is For

More armrest and headrest range matters most if you change position often, or if your build sits outside an average frame. The T90 page lists 230 degrees of armrest rotation and 35 degrees of lateral movement, figures that don't appear on the T50 2nd Generation page. That suggests a chair built around a wider range of postures, like leaning sideways to reach a second screen or turning to chat with someone beside the desk.

Weight tells a related story. At about 28.7 kg against 17.6 kg, the T90 is a bigger, heavier build. That suits a chair that stays put in a dedicated office more than one that travels between rooms.

What the T90 Doesn't Clearly Beat

Both chairs carry the same 125 kg load rating and the same five year limited warranty, so neither figure favours the pricier chair. The T90 page gives no lumbar measurement, where the T50 2nd Generation states 50 mm of height and 10 mm of depth. If lower back support is your main reason for shopping, the T90's extra armrest and headrest travel doesn't automatically win you that. A higher price tag and better back support are two different things.

Recline is a similar story. The T50 2nd Generation states five limits from 105 to 130 degrees. The T90 page describes adjustable recline and adjustable return resistance but gives no angles, so a side by side comparison isn't possible from the pages as written.

Upholstery Is the Other Real Difference

The T90 offers mesh, fabric and two leather options, including the made to order Natural Leather Limited Palette. The T50 2nd Generation page doesn't name a material choice in the same way. If leather is what you're after, the T90 is the option in the current range, not something you can add to the T50 2nd Generation. For some of us, that settles things before price even enters the chat.

A Made Up Comparison

Picture a made up scenario. Two colleagues both buy a SIDIZ chair for home in the same month. One sits at a single desk most of the day and likes the lower back adjustment the T50 2nd Generation states. The other works at a wide desk with two screens, turns often for calls, and wants leather to match the room. The first is a clear T50 2nd Generation buyer. The second has reasons specific to their setup, not just a bigger budget, to choose the T90.

Who Each Chair Actually Suits

What Neither Page Tells You

Neither page states a seat height or seat depth range as text, and neither names a recommended user height. If you're unusually tall, short or heavy for the 125 kg rating, measuring yourself and emailing our support team before you order is worth more than the price difference between these two. It applies to both chairs equally, so it isn't a reason to pick one.

Reading the Armrest Numbers

Armrest figures can look abstract, so here is how we'd read them. Height travel decides whether your forearms rest level with the desk. Depth decides how close the pads sit to your keyboard. Rotation and lateral movement decide whether the arms follow you when you turn. The T90's 60 mm of depth and 230 degrees of rotation give it more room to follow your posture. The T50 2nd Generation's 30 mm of depth and 20 degrees of angle cover a steadier, single desk routine. Neither is better in the abstract, since it depends on how much you move.

Which Desk Suits Which Chair

A standard single desk with one screen is where the T50 2nd Generation feels at home. The chair stays in place, the keyboard sits where it always does, and the stated lumbar and recline range cover the day. The T90 comes into its own on a wider desk, an L shaped setup, or anywhere you swing between screens. Its heavier build and bigger footprint also suit a room with space to spare. In a tight spare room, the lighter chair is usually the friendlier choice.

Buying Near the Pre-Order Deadline

Both chairs are on pre-order as at 26 October 2026. The T50 2nd Generation page shows Wave 2, closing 30 November 2026, with delivery estimated for mid-December 2026. The T90 page now shows the same Wave 2 terms, after showing an earlier Wave 1 close date of 10 October 2026 on a previous check this month. Pages in this range have changed more than once, so it's worth confirming the wave and close date on the page itself before you order.

Running Costs Over Time

Let's use the five year warranty period as a rough horizon. Eight hours a day, five days a week, for 48 weeks a year across five years comes to 9,600 hours. On that basis, the T50 2nd Generation works out to about 5 cents an hour, and the T90 at its listed price to about 14 cents an hour. Both are small next to most things at a desk, so the better question is still fit, not the hourly figure.

If You Already Own One of These Chairs

If you have a T50 2nd Generation and you're wondering about an upgrade, the pages suggest a fairly narrow answer. The T90 buys armrest and headrest range and a leather option, not a jump in load rating or warranty length, since both already sit at 125 kg and five years. If your lumbar support is doing its job, upgrading is a comfort and build treat, not a fix for a problem the T50 wasn't solving.

If Neither Quite Fits

The gap between $449 and $1,299 is wide, so a third option is worth a mention. The T60 states a headrest with up to 125 mm of height adjustment and lumbar support with seven height settings and three depth settings, at $549 on pre-order. That sits much closer to the T50 2nd Generation on price while stating more lumbar detail than either chair here. If back support is the deciding feature and the T90's price is the sticking point, give the T60 a look.

Returns and Change of Mind

If either chair turns out wrong for your desk, the SIDIZ return policy allows change of mind returns within 30 days. The item needs to be unused and in its original condition. A 30 per cent restocking fee applies and shipping isn't refunded. Special order products are excluded from returns, so it's worth keeping that in mind for the T90's made to order leather option. Cancelling a pre-order before it's picked and packed is a separate process, covered on the product pages.

Delivery and Setup

Neither page states an assembly time. The T90 weighs about 28.7 kg against the T50 2nd Generation's 17.6 kg, so putting it together alone is a bigger job. Asking a friend to help with the heavier chair is just good sense, and nothing to do with having chosen badly.

Testing Before You Buy

A spec comparison is a starting point, not a substitute for sitting in the chair. If you can get to a showroom, or a friend has either model, spend a few minutes at a real desk doing real work. The armrest and headrest figures describe maximum travel, not how the adjustment feels under your own arms and shoulders. The same goes for leather, since photos rarely show how an upholstery feels after a full day in it.

Conclusion

The T90 isn't simply a more expensive T50 2nd Generation. It gives more armrest and headrest travel and a leather option, in a heavier build, at close to three times the price. The T50 2nd Generation states a lumbar adjustment figure the T90 page doesn't, and gives a full recline range in degrees where the T90 page doesn't.

So the honest question isn't which chair is better. It's which gaps on each page matter for your own desk, your own back and your own budget. Read both pages for what they state, and let that guide the purchase rather than the size of the number on the price tag. Either way, we're happy to help you choose.

Sources Referenced

1. SIDIZ Australia product pages: T50 2nd Generation, T90 and T60, and the return policy page (sidiz.au), as at 26 October 2026.