Cannondale Synapse Carbon 4 2025 Red Road Bike

Available with Cannondale in the sizes shown above. Expect delivery within 3-4 working days of placing an order.

Go long, go short, go fast. This is WorldTour performance for real world rides.

Wireless brains meet all-road brawn. Synapse Carbon 4 runs Shimano 105 Di2 for a shifting experience that feels straight off the pro tour, minus the bank loan. The frame delivers that signature Synapse ride—quietly fast, endlessly composed—and plays nice with wide tires, fenders, and long days. Call it the sweet spot between Sunday speed and weekday practicality.

Lightweight, smoothly compliant, sleekly aero Synapse carbon frameset with StashPort downtube storage

Shimano 105 Di2 – Impressively smooth shifting from Shimano’s journeyman electronic 2×12-speed drivetrain

DT Swiss 470 rims with Vittoria Rubino Pro IV 32c tires – grip, durability, and speed

Cannondale C1 Aero 27 Carbon seatpost – speed meets comfort

Fizik Vento Argo R5 saddle – ergonomic comfort with pressure relieving cutout

Specification

Frame	Synapse Carbon, Proportional Response construction, integrated cable routing, downtube Stashport, 12×142 thru-axle, UDH, BSA 68mm threaded BB, flat mount disc, integrated seat binder, SmartSense Gen 2.0 compatible, fender mounts
Fork	Synapse Carbon, integrated crown race, 12×100mm thru-axle, flat mount disc, internal routing, 1-1/8” to 1-1/5” Delta steerer, 55mm offset, fender mounts
Headset	Integrated, 1-1/8” – 1-1/2”
Rear Derailleur	Shimano 105 Di2 7150
Front Derailleur	Shimano 105 Di2 7150, braze-on
Shifters	Shimano 105 Di2 R7170, wireless, 12-speed
Chain	Shimano 105 7100, 12-speed
Crank	Shimano 105 7100, BSA, 50/34
Cassette	Shimano 105 7100, 11-36, 12-speed
Bottom Bracket	Shimano BSA 68
Brakes	Shimano 105 7170 hydraulic disc, 160/160 RT70 rotors
Brake Levers	Shimano 105 Di2 7120 hydraulic disc
Rims	DT Swiss R470 db, 28h
Spokes	Stainless Steel, 14g
Hubs	(F) Shimano RS470, 12×100mm centerlock / ® Shimano RS470, 12×142mm centerlock
Tyres	Vittoria Rubino Pro IV, 700×32c
Handlebar	Vision Trimax Aero Alloy
Stem	Cannondale C1 Conceal, Alloy, 31.8, -6°
Bar Tape	Cannondale Bar Tape, 3.5mm
Saddle	Fizik Vento Argo X5, 140m
Seatpost	Cannondale C1 Aero 27 Carbon, SmartSense compatible, 330mm length, 0mm offset (44-48cm), 15mm offset (51-61cm)
Extras	Large StashBag downtube storage bag

Specifications are subject to change without notice

Size Guide

Frame Size	Minimum Height	Maximum Height
44	152cm (5’0”)	162cm (5’4”)
48	157cm (5’2”)	167cm (5’6”)
51	165cm (5’5”)	175cm (5’9”)
54	170cm (5’7”)	180cm (5’11”)
56	175cm (5’9”)	185cm (6’1”)
58	182cm (6’0”)	193cm (6’4”)
61	190cm (6’3”)	1203cm (6’8”)

We have developed our size guide from our selling experience and it may differ from the manufacturers guide. Please note, this is only a guide and if you have any concerns over sizing please get in contact

Geometry

Frame Size	44	48	51	54	56	58	61
A – Seat Tube Length cm	40.7	40.7	44.3	48.0	52.0	55.0	59.0
B – Top Tube Horizontal cm	52.2	53.3	54.4	55.5	56.7	58.0	59.8
C – Top Tube Actual cm	47.8	48.6	49.7	50.9	52.3	53.7	55.6
D – Head Tube Angle	69.8°	70.9°	71.3°	71.3°	71.3°	71.3°	71.3°
E – Seat Tube Angle	73.0°	73.0°	73.0°	73.0°	73.0°	73.0°	73.0°
F – Standover cm	71.4	72.2	75.2	78.5	81.5	84.3	87.8
G – Head Tube Length cm	9.1	10.8	12.7	15.0	17.1	19.6	22.7
H – Wheelbase cm	100.3	100.5	101.3	102.6	104.4	105.8	107.7
I – Front Center cm	58.9	59.2	60.0	61.2	62.4	63.8	65.7
J – Chain Stay Length	42.5	42.5	42.5	42.5	43.0	43.0	43.0
K – Bottom Bracket Drop cm	7.5	7.5	7.5	7.3	7.3	7.0	7.0
L – Bottom Bracket Heigh cm	27.8	27.8	27.8	28.0	28.0	28.3	28.3
M – Fork Rake cm	5.5	5.5	5.5	5.5	5.5	5.5	5.5
N – Trail cm	7.1	6.4	6.1	6.1	6.1	6.1	6.1
0 – Stack cm	51.0	53.0	55.0	57.0	59.0	61.0	64.0
P – Reach cm	36.6	37.1	37.6	38.1	38.7	39.3	40.2
Q – Axle to Crown cm	39.3	39.3	39.3	39.3	39.3	39.3	39.3

Want to compare the size of your current bike to this one? Read our Reach and Stack guide here.