Made in Australia: Trinity MTB’s second prototype, built for

It’s been barely a year since Trinity MTB made its debut appearance at the Handmade Bicycle Show Australia with a first prototype bike that showed a lot of creative promise.

Now the Handmade show is back for another year, just like the little Trinity MTB team. This year they’re showing off their second prototype, a bike engineer Mick Williams says was built for “Downduro” (think Enduro, but with shuttles between timed descents). Oh yeah, there’s a new category label, and it’s no longer just a joke of waki

Trinity MTB is still not ready to bring its bike to market, the scourge is that there are still some big changes to come before its early 2023 sale date. While the bike is expected to have a lot more changes, here’s a look at the final prototype build.

What’s new?

The new prototype, Prototype 2, builds on common themes introduced in the former. The frame is still constructed with a chromoly 4130 front triangle and a CNC machined rear triangle, all shown in a raw state. There is still a high pivot and tensioner layout. And the rear shock is still slung low in a modular bottom bracket assembly designed to fit a regular drivetrain (shown), pinion gearbox, Effigear gearbox, or Trinity’s own derailleur driven gearbox which remains under development.

However, take a closer look and the specific approach to all those finer details has changed and advanced. The front triangle now features 3D steel printed lugs on key sections where the 4130 tubes are directly welded to. These printed parts are produced by Australian manufacturer Zeal 3D and the goal is to clean up and lighten more intricate parts of the bike, such as the shock absorber, head tube and split seat tube segments. Meanwhile, the one-piece CNC-machined 7075-T6 rear has intricate latticework on the inside to save weight.

Shock placement is similar to the first prototype, but the suspension system has been changed, turning what is arguably a simpler virtual high-spindle layout with a fixed position tensioner. Trinity MTB claims this approach offers an elongated rear center, optimal leverage curve and all in a compact package. Rear travel sits at 170mm as pictured (front 180mm), but the company designed it to be bumped to 180-195mm through the use of a longer shock absorber. A coil shock can be used, but it is only recommended in the longer travel setting.

Shock placement is similar to the first prototype, but the suspension system has been changed, turning what is arguably a simpler virtual high-spindle layout with a fixed position tensioner.

The bike now rolls like a mule, with a 29er wheel up front and a 27.5 in the back. And the geometry has been tweaked around that, with a head tube that now sits at 64 degrees (an AngleSet headset can be used) and a not-so-long reach of a 445mm (medium size). The aim is to offer four sizes, with a reach of up to 520 mm.

A few other notable details come from Mick Williams’ other company, Williams Racing Products. It’s been seen there before sprag clutch based CentreHub crankspin† While in front sits the Stuart trunk, which belongs to Lachy McKillop (@Spinthatup) 44mm length custom concept to match the fork rake, sleek wedge clamp design and integrated computer mount.

As mentioned, this bike is very much a prototype to test some concepts and see how things progress. And it looks like it’s going fast.

Borrowed from the road world, a SRAM Force AXS rear derailleur is mated to a small cassette for a gear configuration that’s clearly not made for climbing.

Up front is the Stuart stem, Lachy McKillop’s custom concept with a 44mm length to match the fork rake, a sleek wedge clamp design and an integrated computer mount.


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