An Emerald-Isle Mosaic GT-1 iAR

The client for this Regroup Custom Mosaic GT-1 iAR gravel bike in cobalt grey is a former racer who recently moved back to Phoenix from NorCal. He was looking for a bike that could go fast and offer comfort without looking too comfortable, and we knew what he meant.

Some builds start with a call, but few phone so late at night. However, our client happened to dial while Regroup’s Adam was in Ireland, where they both fell under the spell of the Blarney Stone, talking until almost midnight about desirous dream bikes. Given how understated this titanium gravel bike is, how the grey hues meld and merge to suggest a deeper texture that belies the bike’s minimalist color palette, it was clearly an excellent conversation. We wonder if Ireland’s famously grey and windy weather inspired the paint scheme. If it did, we might suggest that Adam head to the Emerald Isle more often.

Beneath Mosaic’s perfectly executed paint job, there are a few noteworthy things to this build. Our client struggled with some flexibility issues, which, combined with his proportions, made him the perfect candidate for a fully custom Mosaic GT-1 with a personalized tube profile and a geometry crafted to his precise measurements. With an in-depth fit courtesy of our friends at Cyclologic, we were able to build him a stout bike (note the 34.9 ISP downtube) that could smash watts without a hint of noodle.

The build centers on the Mosaic GT-1 iAR (Integrated All-Road) titanium gravel frame, which won the Gravel Nationals in 2024 while piloted by California’s Brennan Wertz. It’s a superb frameset, buttery smooth, stiff and made for millions of miles. We’re not kidding – titanium bikes go forever. There’s a lot more to it than these words suggest. So call, swing by the shop or email to chat with us about your own Mosaic GT-1. We’ll have the Blarney Stone on standby.

We paired the frame with SRAM’s AXS E1 groupset, Zipp’s 353 NSW wheels and an ENVE cockpit (that grey tape is also ENVE). Finishing details include a Ceramicspeed bottom bracket and a Silca Sicuro titanium bottle cage.