The Osiris is an endurance road bike with a secret: it's more versatile, more comfortable, and more accessible than any dedicated race machine — without ever feeling slow.
The Osiris is all about riding all day and arriving with something left. Its endurance geometry puts you in a position that's efficient without being punishing — letting you push harder for longer than you thought possible.
32mm tyre clearance means you're not limited to billiard-table tarmac. Rough chip-seal, light gravel, and long-distance rides with unpredictable surfaces are all well within the Osiris's comfort zone.
Talk to us about a build →The Osiris is designed for riders who want to go further, faster, and more comfortably — without having to choose between performance and versatility.
A higher stack and relaxed angles keep you comfortable on long climbs and 200km rides. You arrive at the end of a big day feeling like you could ride further — because the bike isn't fighting you.
The Osiris is compatible with both mechanical and electronic groupsets. This means that the Osiris can be built at a lower base price compared to its aero allroad sibling, the Nui V2, which is electronic only. The Osiris frameset is a highly upgradeable platform, so you can start simple and the bike can evolve as your riding does.
32mm road tyres give you meaningful compliance on rough roads. The sweet spot for most riders — fast enough on smooth tarmac, comfortable enough on everything else.
Unlike the Nui V2, you can run a conventional handlebar and stem on the Osiris — giving you easier fit adjustment and the freedom to set your position exactly how you want it.
High-modulus carbon throughout means the Osiris is light, stiff where it counts, and compliant where you want it to be. This isn't a budget carbon frame — it's a carefully engineered one.
Framesets from $1,650 and complete bikes from $2,650 make the Osiris the most accessible way into the Montu lineup — without cutting corners on what matters.
The Osiris specification is designed for flexibility — mechanical or electronic, traditional or integrated cockpit. Build it the way you want it.
Talk spec with us →| Frame material | 100% Toray T700 carbon fibre |
| Frameset price | $1,650 CAD + tax and shipping |
| Complete bikes from | $2,650 CAD |
| Sizes | Five sizes: XS, S, M, L, XL |
| Max tyre clearance | 32mm (road). Up to 35mm possible depending on tyre and rim combination. |
| Bottom bracket | Threaded |
| Drivetrain | Mechanical or electronic. 1× or 2×. Compatible with Shimano and SRAM groupsets. |
| Cockpit | Compatible with conventional handlebar/stem or integrated cockpit |
| Brakes | Hydraulic disc, flat-mount |
| Seatpost | 27.2mm round |
All measurements in mm unless noted
| Size | S | SC | O | HS | HC | F | OT | WB | FC | RC | G | Reach | Stack |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| XS | 430 | 74.8° | 516 | 120 | 70.8° | 380 | 45 | 986.1 | 582.8 | 415 | 75 | 370.8 | 532.8 |
| S | 460 | 74.3° | 530 | 138 | 71.7° | 380 | 45 | 987.8 | 584.5 | 415 | 75 | 374.2 | 553.1 |
| M | 490 | 73.9° | 546 | 157 | 72° | 380 | 45 | 998.6 / 998.4 / 1012.9 | 594.6 | 415 | 73 | 380.8 | 571.2 |
| L | 520 | 73.5° | 560 | 172.5 | 73° | 380 | 45 | 998.4 | 594.4 | 415 | 73 | 385 | 589.3 |
| XL | 550 | 73° | 580 | 195 | 73° | 380 | 45 | 1012.9 | 608.8 | 415 | 73 | 392.9 | 610.6 |
Reach and Stack (highlighted) are the most useful measurements for determining fit. Size M shows three WB variants corresponding to different build configurations. Contact us if you need help interpreting these numbers.
Three routes to getting your Osiris — from frameset to full custom build.
Frame, fork, and headset. Build it yourself or have us assemble it. Pro build labour $300 if you'd like Montu to put it together from a parts kit that you provide.
Choose your groupset (mechanical or electronic), wheels, finishing kit, and cockpit setup. We build it, set it up, and hand it over ready to ride.
Not sure where to start? Book a free consultation. We'll walk you through the options, help you pick the right spec, and answer every question — no pressure, no obligation.
Configure your build online, or book a consultation and we'll spec it together.
