Mosaic RT-1D Crit Edition

26 Jan, 2018

Baby Blue Beast

Our very own Head Fitter and man of a million talents, Mike Cahill loves to go fast. Crit racing elbow to elbow with his closest friends at 30mph is where he is the happiest. He wanted a custom bike that would be fast, comfortable and blue.  We turned to our friends in Boulder at Mosaic to create a one of a kind RT-1 Disc. Utilizing never before used extra oversized tubes, a good amount of Belgium Blue paint, the latest Shimano Dura Ace Di2 Hyraulic groupset and Limited Edition Enve Manual for Speed wheels with Chris King hubs, Mike has one the coolest bikes we have ever had the pleasure of building.


Except for the SRM power meter the entire build kit is Shimano's latest 9170 Dura Ace. Mike opts for a 11-28 cassette.  With plenty of range and small gaps between gears it is perfect for crit courses which are devoid of long uphill sections. Any short climb will be punchy and likely to be taken at a very high wattage.  Note the super clean Di2 and Hydraulic line routing, and massive chain stays to extra stiffness.


Moving around the bike you can see our AV logo on the seat tube and a Colorado Flag with text to let you know where the bike came from. Not seen are the gorgeous welds hidden underneath the paint.


You can see about half of what are extremely short 405mm rear chain stays for extra crisp handling.  Also the backside of Mike's SRM with 53/39 rings is hiding behind the tubes.  Note the shaping on the downtube. Mosaic used a special larger diameter tube that they had never put into production before for fear of it being too stiff.  No such concerns here. In order to mate it to the bottom bracket, they had to custom shape the bottom of the tube.


Mike runs 140mm rotors front and rear. Cooling fins on the pads and Ice Tech rotors have plenty of ability to dissipate the heat created. 


One of the more talked about parts of this bike is the Limited Edition Enve 5.6 Manual For Speed Wheelset with Chris King hubs. For most clients we tend to recommend wheels that are 50mm or shallower unless speeds are averaging north of 24mph on a ride. Given this bike is designed to spend most of its life closer to 30mph these wheels were an obvious choice. Plus the graphics look cool as hell.  Mike also chooses 25mm Conti GP 4000 II tires. Light, supple, grippy, durable and super fast rolling, they are a great choice for racing and everyday riding.


Nothing but clean lines and smooth paint from this angle. Note the tidy wiring coming off of the stem into the downtube. No Internal Bar End Junction on this bike, instead a normal junction box is hidden underneath the stem, the effect is just the same though on the overall profile.


A custom painted Zipp seatpost with Prologo Zero II Saddle.  Mike runs a very aggressive position that is rotated forward on the bike, thus the zero offset seatpost. While not awesome for 5 hour rides, it helps him get the most power to the pedals for his hour long races.


Also custom painted to match is this Vision Metron 5D one piece bar and stem. At 130mm long and measuring 41cm from center to center it is harder to get a stiffer cockpit. Note the sprint shifters sticking out from the bartape on the drops. 




140mm Rotor in the front as well. The Enve fork routes the hydraulic line beautifully.


Time to grab these bars and ride!



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