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BH SL1 4.5 Ultegra Di2 vs Cannondale Synapse Carbon 4 Shimano 105 Di2 12v

BH SL1 4.5 Ultegra Di2, side view

BH

SL1 4.5 Ultegra Di2

Cannondale Synapse Carbon 4 Shimano 105 Di2 12v, side view

Cannondale

Synapse Carbon 4 Shimano 105 Di2 12v

High endEnduranceCarbon700c2026
High endEnduranceCarbon700c2026

Close on the specs and the list price: here are their 10 differences, line by line.

BH SL1 4.5 Ultegra Di2, side viewBHBH SL1 4.5 Ultegra Di2
List price £3,636
Cannondale Synapse Carbon 4 Shimano 105 Di2 12v, side viewCannondaleCannondale Synapse Carbon 4 Shimano 105 Di2 12v

At a glance

  • BH SL1 4.5 Ultegra Di2 has the higher-range groupset: Shimano Ultegra Di2, against Shimano 105 Di2.
Key specs3 differences
List price £3,636 –Not given
Model yearSame for all 2026 2026
FrameSame for all Carbon
As printed

Toray T400 Carbon with HCIM (Hollow Core Internal Molding)

 Carbon
As printed

Synapse Carbon, Proportional Response construction, integrated cable routing, downtube Stashport

Wheelset 700c · Vision Team TC30 i23
As printed

Wheelset: Vision Team TC30 i23

 700c · DT Swiss R470 DB, 28h
DrivetrainSame for all 2×12 2×12
Groupset Shimano Ultegra Di2 Higher range
As printed

Shimano Ultegra DI2 shift levers

 Shimano 105 Di2
Brake model Shimano Ultegra hydraulic Higher range
As printed

Front/rear brake: Shimano Ultegra hydraulic

 Shimano 105 7170 hydraulic disc
Seatpost BH Lite 27,2 –Not given

Prices

Each model's retailers, delivered to your country, and their prices over time.

BH SL1 4.5 Ultegra Di2

BH SL1 4.5 Ultegra Di2

Cannondale Synapse Carbon 4 Shimano 105 Di2 12v

Cannondale Synapse Carbon 4 Shimano 105 Di2 12v

Character

  • SL1 4.5 Ultegra Di2 · endurance road bike, carbon frame, 700c wheels, 2×12 drivetrain, high end equipment
  • Synapse Carbon 4 Shimano 105 Di2 12v · Road bike average gearing, rather high equipment.

Gearing

Speed in the lowest and the highest gear at 90 rpm: lower on the left climbs easier, higher on the right goes faster.

  • Cannondale Synapse Carbon 4 Shimano 105 Di2 12v12 km/h - 53 km/h
Easiest gear (climbing)Hardest gear (descending)
BH SL1 4.5 Ultegra Di2Cannondale Synapse Carbon 4 Shimano 105 Di2 12v

Components and specs

Every spec line by line; the higher range of a component is marked. The technical groups are folded.

Ride type
Ride typeSame for all Endurance
As printed

Designed for those who seek long distances

 Endurance
As printed

bikes/road/endurance; Comfortable high-performance road riding, long distance missions, fast group rides

Frame and fork1 difference
ForkSame for all Carbon
As printed

SL1 Disc Full Integrated Tapered, Full Carbon 1.5"

 Carbon
As printed

Synapse Carbon, integrated crown race, 12x100mm thru-axle, flat mount disc

Max tyre clearance 32 mm 42 mm Best of the comparison+10 mm
AxlesSame for all Thru-axles
As printed

12 mm Thru Axle, hidden and tool-free

 Thru-axles °Value not published by the brand
As printed

Synapse Carbon, Proportional Response construction, integrated cable routing, downtube Stashport, 12x142 thru-axle, UDH, BSA 68mm threaded BB, flat mount disc,

Bottom bracket BB386EVO
As printed

BB386EVO system

–Not given
Cable routing–Not given Fully integrated °Value not published by the brand
As printed

integrated cable routing

Seatpost diameter 27.2 mm –Not given
Drivetrain4 differences
Groupset brandSame for all Shimano
As printed

Shimano Ultegra DI2 shift levers

 Shimano
As printed

Shimano 105 Di2

ShiftingSame for all Electronic, wired
As printed

Shimano Ultegra DI2 shift levers

 Electronic, wired
As printed

Shifters: Shimano 105 Di2 R7170, wireless, 12-speed

ChainringsSame for all 2 °Value not published by the brand 2 °Value not published by the brand
Gears at the backSame for all 12 12
Chainring teeth Shimano Ultegra 52/36 Higher range
As printed

Crank set: Shimano Ultegra 52/36

 Shimano 105 7100 50/34
Cassette Shimano 105 11/34
As printed

Cassette: Shimano 105 11/34

 Shimano 105 7100 11-34
Rear derailleur Shimano Ultegra DI2 12sp °Value not published by the brandHigher range Shimano 105 Di2 7150 °Value not published by the brand
Shifters Shimano Ultegra DI2 °Value not published by the brandHigher range Shimano 105 Di2 R7170, wireless, 12-speed °Value not published by the brand
Brakes
BrakesSame for all Hydraulic disc
As printed

Shimano Ultegra hydraulic (SL1 Disc frame)

 Hydraulic disc
As printed

Shimano 105 7170 hydraulic disc

Front rotor–Not given 160 mm
Rear rotor–Not given 160 mm
Wheels and tyres2 differences
Wheel sizeSame for all 700c / 29"
As printed

Hutchinson Nitro 700x28

 700c / 29"
As printed

Vittoria Rubino Pro IV, 700x32c

RimsSame for all Aluminium °Value not published by the brand Aluminium °Value not published by the brand
Tyres Hutchinson Nitro 700x28
As printed

Tyres: Hutchinson Nitro 700x28

 Vittoria Rubino Pro IV, 700x32c
Tyre width fitted 28 mm 32 mm +4 mm
Cockpit and seatpost
Handlebar FSA Energy ACR °Value not published by the brand–Not given
Stem BH SL °Value not published by the brand–Not given
Seatpost model BH Lite 27,2 °Value not published by the brand–Not given

° Value not published by the brand

Where to buy them

Compare the whole Cannondale Synapse range

Frequently asked questions

What groupset do BH SL1 4.5 Ultegra Di2 and Cannondale Synapse Carbon 4 Shimano 105 Di2 12v come with?

BH SL1 4.5 Ultegra Di2: Shimano Ultegra Di2. Cannondale Synapse Carbon 4 Shimano 105 Di2 12v: Shimano 105 Di2.

Other comparisons

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