Mosaic RT-1 2023 geometry

No OEM studio shot for this year yet.

Size chart for fitting. If this bike already feels right, find others with a similar riding position (size 51). Category: road-race.

Size	Stack	Reach	Head tube angle	Seat tube angle	Chainstay	Wheelbase	BB drop
51	524 mm	374 mm	71.5°	74.5°	410 mm	982 mm	72 mm
53	542 mm	380 mm	72.0°	74.0°	410 mm	988 mm	72 mm
55	560 mm	386 mm	72.5°	73.5°	410 mm	996 mm	70 mm
57	578 mm	392 mm	73.0°	73.0°	410 mm	1006 mm	70 mm
59	596 mm	398 mm	73.0°	73.0°	410 mm	1018 mm	68 mm

What it's like to ride

A race-road geometry: lower stack, longer reach, steeper head angle, and short stays. It wants a committed position and rewards riders who already know their stack/reach. Size 55 sits around 560 mm stack and 386 mm reach, 72.5° head angle, 410 mm chainstays.

Who it's for

Racers and fit club riders. If you need a taller cockpit, look at the brand's endurance model on the same size chart.

Manufacturer trims

RT-1 Shimano 105 Di2

MSRP not listed

Component	Brand	Model	Size
Shifters	Shimano	ST-R7120 105 HRD	2×12
Front derailleur	Shimano	FD-R7100 105	braze-on
Rear derailleur	Shimano	RD-R7100 105	12-speed
Crankset	Shimano	FC-R7100 105	50/34 51170mm 53170mm 55172.5mm 57172.5mm 59175mm
Cassette	Shimano	CS-R7100 105	11-34, 12-speed
Chain	Shimano	CN-M7100 SLX	12-speed
Power meter	—	None	—
Brakes	Shimano

Similar bikes

Size guidance

Stack and reach describe the frame's cockpit envelope better than traditional seat-tube sizing. If you know your preferred stack/reach from a bike that already fits, search within a few millimeters first, then check head angle and chainstay for handling feel. See the glossary for stack, reach, and HTA.

Size	Stem	Bar	Crank
51	90 mm	400 mm	170 mm
53	90 mm	400 mm	170 mm
55	100 mm	420 mm	173 mm
57	100 mm	420 mm	173 mm
59	110 mm	440 mm	175 mm

Mosaic RT-1 2023 geometry

What it's like to ride

Who it's for

Manufacturer trims

RT-1 Shimano 105 Di2

Similar bikes

Size guidance

Mosaic RT-1 2023 geometry

What it's like to ride

Who it's for

Manufacturer trims

RT-1 Shimano 105 Di2

Similar bikes

Size guidance

RT-1 SRAM Rival AXS

RT-1 Shimano Ultegra Di2

RT-1 SRAM Force AXS

RT-1 Shimano Dura-Ace Di2

RT-1 SRAM RED AXS

Cockpit by size

Reviews

Component	Brand	Model	Size
Shifters	Shimano	ST-R7170 105 Di2 HRD	2×12
Front derailleur	Shimano	FD-R7150 105 Di2	braze-on
Rear derailleur	Shimano	RD-R7150 105 Di2	12-speed
Crankset	Shimano	FC-R7100 105	52/36 51170mm 53170mm 55172.5mm 57172.5mm 59175mm
Cassette	Shimano	CS-R7100 105	11-34, 12-speed
Chain	Shimano	CN-M7100 SLX	12-speed
Power meter	—	None	—
Brakes	Shimano	BR-R7170 105	hydraulic disc
Rotors	Shimano	SM-RT70	160mm centerlock
Bottom bracket	Shimano	BSA threaded	—
Wheels	Alloy	road wheelset	700c
Tires	700x28mm	road	—

Component	Brand	Model	Size
Shifters	Shimano	ST-R8170 Ultegra Di2 HRD	2×12
Front derailleur	Shimano	FD-R8150 Ultegra Di2	braze-on
Rear derailleur	Shimano	RD-R8150 Ultegra Di2	12-speed
Crankset	Shimano	FC-R8100 Ultegra	52/36 51170mm 53170mm 55172.5mm 57172.5mm 59175mm
Cassette	Shimano	CS-R8100 Ultegra	11-30, 12-speed
Chain	Shimano	CN-M8100 Ultegra	12-speed
Power meter	—	None	—
Brakes	Shimano	BR-R8170 Ultegra	hydraulic disc
Rotors	Shimano	SM-RT800	160mm / 140mm centerlock
Wheels	40–50	mm carbon wheelset	700c
Tires	700x28mm	road	—

Component	Brand	Model	Size
Shifters	Shimano	ST-R9270 Dura-Ace Di2 HRD	2×12
Front derailleur	Shimano	FD-R9250 Dura-Ace Di2	braze-on
Rear derailleur	Shimano	RD-R9250 Dura-Ace Di2	12-speed
Crankset	Shimano	FC-R9200 Dura-Ace HollowTech II	52/36 51170mm 53170mm 55172.5mm 57172.5mm 59175mm
Cassette	Shimano	CS-R9200 Dura-Ace	11-30, 12-speed
Chain	Shimano	CN-M9100 Dura-Ace	12-speed
Power meter	—	None	—
Brakes	Shimano	BR-R9270 Dura-Ace	hydraulic disc
Rotors	Shimano	RT-MT900	160mm front / 140mm rear
Wheels	50–51	mm carbon aero wheelset	700c
Tires	700x28mm	road	—