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Mosaic Updates the RT-1 For All Roads and Larger Tires

Mosaic is taking on all the roads, updating its RT-1 with a sleeker design, a more capable geometry, and larger tire clearance. This new Mosaic RT-1 ITR is made for the roads we ride, the dirt ones we explore, and out of a timeless material — titanium. 

Mosaic RT-1 ITR Frame Details

Like all Mosaic bikes, the RT-1 ITR (Integrated Thick Road) is entirely made to order, and it’s crafted from custom T3A/2.5V double-butted titanium tube sets. Mosaic calls its T3A/2.5V tubes “a particular blend and rider-specific selection of double-butted titanium.” Mosaic can customize tubes depending on the rider’s fit requirements, ride preferences, and build configuration.

Mosaic RT1 ITR welds brake boss

The new Mosaic RT-1 ITR can fit up to 35mm tires (more on that later), but they feel the sweet spot is right around 32mm — and we tend to agree. It’s the right mix of plushness without adding significant handling differences from a traditional road machine. 

Mosaic RT1 ITR studio front on

Sleek Front End 

Mosaic and ENVE components always look nice when paired together. It’s something about the grey matte titanium frame and sleek polished carbon.

Mosaic RT1 ITR Enve bars:stem

The new RT-1 ITR employs ENVE’s integrated bar, stem, headset, and road fork. The result is a super clean, sleek-looking front end, keeping the RT-1 ITR modern and clutter-free.

Mosaic RT1 ITR seatstay

Mosaic RT-1 ITR Frameset Features

  • Tubeset || Custom T3A/2.5V Double Butted Titanium Tubeset
  • Geometry || Custom (Mosaic stock sizes also available)
  • Tire Clearance || 700x35mm (Measured) **See Note Below**
  • Fork || ENVE Integrated Road Fork (43 or 50 rake)
  • Headset || ENVE Integrated Headset
  • Brake Mount || Flat Mount Disc
  • Brake Routing || Integrated Internal
  • Shift Routing || Integrated Di2 or eTap
  • Axle Spacing || 12×100 Front // 12×142 Rear
  • Bottom Bracket || Threaded BSA 68mm
  • Seatpost Diameter || 30.9 (27.2, 31.6 Optional)
  • Front Derailleur Mount || Clamp or braze-on
  • Water Bottle Mounts || Two – Down tube and seat tube
  • Finish || Mosaic Finishwork Program
  • Sizes || Available in sizes 48, 50, 52, 54*, 55, 56, 58, 60, and 62cm *Tested
  • Lead Time || 8 weeks
  • Price || $8,200 for frame, fork, ENVE stem, and ENVE seatpost

Mosaic RT-1 ITR Geometry and Sizing 

Mosaic RT1 ITR geometery table

The geo listed is the “standard geometry,” but the Mosaic RT-1 ITR is inclusive of custom geometry and a complete choice of Mosaic Finishwork is available at the customer’s request. 

Mosaic RT1 ITR WTB tire tread

A Note on Tire Clearance & Compatibility

Mosaic takes its frames very seriously and wants to ensure everyone is on the same page with tire compatibility. Now, with ultra-wide (30mm, I’m looking at you) gravel rims, tires that are marked one size, can balloon up to another, and not fit your frame. Mosaic states the new RT-1 ITR will fit tires up to 34-35mm tires (actual width). 

Mosaic RT1 ITR studio side 3:4

Mosaic states: “We anticipate that there will be several 34-35mm tires that, depending on the rim they’re paired with, will not work with the RT-1 ITR, as their actual width measures far over 35mm. If you’re curious about the tires we’ve tried and the ones we’ve landed upon as favorites, please don’t hesitate to reach out. We would be happy to provide a recommendation.” 

Mosaic RT1 ITR bridge

So if you’re second-guessing the tires on your favorite wheelset, or just wanna make sure you’re getting the most from your frame, contact Mosaic. Chances are, if you’re purchasing one of these frames, you’ll be in talks with them already.

Mosaic RT1 ITR logo

Mosaic RT-1 ITR First Impressions 

When I first received the Mosaic RT-1 ITR, I was excited. I see many carbon frames and race-only focused equipment, which this bike transcends. The timeless titanium ride and the visible craftsmanship make this bike something more. 

Mosaic RT1 ITR head badge

The build is apt for the frameset; ENVE cockpit, Shimano Dura-Ace 12 Di2 groupset (compact chainset) paired with HUNT 48 Limitless wheels w/ CeramicSpeed Bearings. The wheels are paired with WTB Expanse tires, just enough to get on dirt roads and feel confident. 

Mosaic RT1 ITR stem and stack

First Ride Impressions 

Though my ride time on the RT-1 ITR has been brief, the impressions are strong. The first sensation of getting the RT-1 ITR on the open road is the unmistakable titanium resonance. As I said, I ride many carbon bikes, so being out on a ti-frame is a nice change of pace. 

Mosaic RT1 ITR Dura-Ace Crankset

Pushing power on the pedals, the RT-1 ITR offers the response of a road race bike, and the component assortment helps it excel. The 32mm WTB tires are enough to ride worry-free through unpaved roads and smooth enough to sing on the tarmac. 

Mosaic RT1 ITR hunt wheels

Designed to have the same intuitive steering response as Mosaics’ RT-1d, the RT-1 ITR has a snappy ride and is punchy when called to move. 

Mosaic RT1 ITR studio logo

The bike’s front end has to be my favorite bit so far. It is clean but has the classic ti-frame look that stands out from the carbon crowd. The matching fork is an excellent touch that can easily be overlooked, but it’s hard to miss the quality when installing the front wheel

Mosaic RT1 ITR ceramic speed hubs

On the road, the bike feels like a more elegant machine than something “all-road.” The geometry and tucked-in rear give the RT-1 ITR a quick feel in the corners, and it moves over the road gracefully. 

Mosaic RT1 ITR welds

I appreciate the thin seat stays; combined with the 32mm tires, they soak up a decent amount of road chatter. Though the 48mm deep HUNT wheels are stiff enough to prove this frame can still throw down an effort. 

Mosaic RT1 ITR hunt wheels WTB logo

We look forward to more time on the Mosiac RT-1 ITR this spring and will report back with a full review. Until then, check out the full details and ordering information on Mosaiccycles.com

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22 COMMENTS

  1. Wow, the Mosaic RT-1 ITR is like the superhero of bikes, ready for any road and tire size! Im already dreaming of epic adventures!

    • Well, the sleek design of the Mosaic RT-1 ITR might give you the illusion of a smoother ride, but dont get your hopes up. Looks can be deceiving, my friend. Its all about the components and engineering, not just aesthetics. Ride it before you judge it.

    • I couldnt disagree more. The Mosaic RT-1 may claim to be versatile, but it falls short when it comes to tackling extreme terrains. Its more like a rusty pocket knife than a reliable Swiss Army knife. Stick to a specialized bike if you want true adventure. #ChooseWisely

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